linux/include/linux/sched.h
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   1#ifndef _LINUX_SCHED_H
   2#define _LINUX_SCHED_H
   3
   4/*
   5 * cloning flags:
   6 */
   7#define CSIGNAL         0x000000ff      /* signal mask to be sent at exit */
   8#define CLONE_VM        0x00000100      /* set if VM shared between processes */
   9#define CLONE_FS        0x00000200      /* set if fs info shared between processes */
  10#define CLONE_FILES     0x00000400      /* set if open files shared between processes */
  11#define CLONE_SIGHAND   0x00000800      /* set if signal handlers and blocked signals shared */
  12#define CLONE_PTRACE    0x00002000      /* set if we want to let tracing continue on the child too */
  13#define CLONE_VFORK     0x00004000      /* set if the parent wants the child to wake it up on mm_release */
  14#define CLONE_PARENT    0x00008000      /* set if we want to have the same parent as the cloner */
  15#define CLONE_THREAD    0x00010000      /* Same thread group? */
  16#define CLONE_NEWNS     0x00020000      /* New namespace group? */
  17#define CLONE_SYSVSEM   0x00040000      /* share system V SEM_UNDO semantics */
  18#define CLONE_SETTLS    0x00080000      /* create a new TLS for the child */
  19#define CLONE_PARENT_SETTID     0x00100000      /* set the TID in the parent */
  20#define CLONE_CHILD_CLEARTID    0x00200000      /* clear the TID in the child */
  21#define CLONE_DETACHED          0x00400000      /* Unused, ignored */
  22#define CLONE_UNTRACED          0x00800000      /* set if the tracing process can't force CLONE_PTRACE on this clone */
  23#define CLONE_CHILD_SETTID      0x01000000      /* set the TID in the child */
  24/* 0x02000000 was previously the unused CLONE_STOPPED (Start in stopped state)
  25   and is now available for re-use. */
  26#define CLONE_NEWUTS            0x04000000      /* New utsname group? */
  27#define CLONE_NEWIPC            0x08000000      /* New ipcs */
  28#define CLONE_NEWUSER           0x10000000      /* New user namespace */
  29#define CLONE_NEWPID            0x20000000      /* New pid namespace */
  30#define CLONE_NEWNET            0x40000000      /* New network namespace */
  31#define CLONE_IO                0x80000000      /* Clone io context */
  32
  33/*
  34 * Scheduling policies
  35 */
  36#define SCHED_NORMAL            0
  37#define SCHED_FIFO              1
  38#define SCHED_RR                2
  39#define SCHED_BATCH             3
  40/* SCHED_ISO: reserved but not implemented yet */
  41#define SCHED_IDLE              5
  42/* Can be ORed in to make sure the process is reverted back to SCHED_NORMAL on fork */
  43#define SCHED_RESET_ON_FORK     0x40000000
  44
  45#ifdef __KERNEL__
  46
  47struct sched_param {
  48        int sched_priority;
  49};
  50
  51#include <asm/param.h>  /* for HZ */
  52
  53#include <linux/capability.h>
  54#include <linux/threads.h>
  55#include <linux/kernel.h>
  56#include <linux/types.h>
  57#include <linux/timex.h>
  58#include <linux/jiffies.h>
  59#include <linux/rbtree.h>
  60#include <linux/thread_info.h>
  61#include <linux/cpumask.h>
  62#include <linux/errno.h>
  63#include <linux/nodemask.h>
  64#include <linux/mm_types.h>
  65
  66#include <asm/system.h>
  67#include <asm/page.h>
  68#include <asm/ptrace.h>
  69#include <asm/cputime.h>
  70
  71#include <linux/smp.h>
  72#include <linux/sem.h>
  73#include <linux/signal.h>
  74#include <linux/compiler.h>
  75#include <linux/completion.h>
  76#include <linux/pid.h>
  77#include <linux/percpu.h>
  78#include <linux/topology.h>
  79#include <linux/proportions.h>
  80#include <linux/seccomp.h>
  81#include <linux/rcupdate.h>
  82#include <linux/rculist.h>
  83#include <linux/rtmutex.h>
  84
  85#include <linux/time.h>
  86#include <linux/param.h>
  87#include <linux/resource.h>
  88#include <linux/timer.h>
  89#include <linux/hrtimer.h>
  90#include <linux/task_io_accounting.h>
  91#include <linux/latencytop.h>
  92#include <linux/cred.h>
  93
  94#include <asm/processor.h>
  95
  96struct exec_domain;
  97struct futex_pi_state;
  98struct robust_list_head;
  99struct bio_list;
 100struct fs_struct;
 101struct perf_event_context;
 102
 103/*
 104 * List of flags we want to share for kernel threads,
 105 * if only because they are not used by them anyway.
 106 */
 107#define CLONE_KERNEL    (CLONE_FS | CLONE_FILES | CLONE_SIGHAND)
 108
 109/*
 110 * These are the constant used to fake the fixed-point load-average
 111 * counting. Some notes:
 112 *  - 11 bit fractions expand to 22 bits by the multiplies: this gives
 113 *    a load-average precision of 10 bits integer + 11 bits fractional
 114 *  - if you want to count load-averages more often, you need more
 115 *    precision, or rounding will get you. With 2-second counting freq,
 116 *    the EXP_n values would be 1981, 2034 and 2043 if still using only
 117 *    11 bit fractions.
 118 */
 119extern unsigned long avenrun[];         /* Load averages */
 120extern void get_avenrun(unsigned long *loads, unsigned long offset, int shift);
 121
 122#define FSHIFT          11              /* nr of bits of precision */
 123#define FIXED_1         (1<<FSHIFT)     /* 1.0 as fixed-point */
 124#define LOAD_FREQ       (5*HZ+1)        /* 5 sec intervals */
 125#define EXP_1           1884            /* 1/exp(5sec/1min) as fixed-point */
 126#define EXP_5           2014            /* 1/exp(5sec/5min) */
 127#define EXP_15          2037            /* 1/exp(5sec/15min) */
 128
 129#define CALC_LOAD(load,exp,n) \
 130        load *= exp; \
 131        load += n*(FIXED_1-exp); \
 132        load >>= FSHIFT;
 133
 134extern unsigned long total_forks;
 135extern int nr_threads;
 136DECLARE_PER_CPU(unsigned long, process_counts);
 137extern int nr_processes(void);
 138extern unsigned long nr_running(void);
 139extern unsigned long nr_uninterruptible(void);
 140extern unsigned long nr_iowait(void);
 141extern unsigned long nr_iowait_cpu(int cpu);
 142extern unsigned long this_cpu_load(void);
 143
 144
 145extern void calc_global_load(unsigned long ticks);
 146
 147extern unsigned long get_parent_ip(unsigned long addr);
 148
 149struct seq_file;
 150struct cfs_rq;
 151struct task_group;
 152#ifdef CONFIG_SCHED_DEBUG
 153extern void proc_sched_show_task(struct task_struct *p, struct seq_file *m);
 154extern void proc_sched_set_task(struct task_struct *p);
 155extern void
 156print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq);
 157#else
 158static inline void
 159proc_sched_show_task(struct task_struct *p, struct seq_file *m)
 160{
 161}
 162static inline void proc_sched_set_task(struct task_struct *p)
 163{
 164}
 165static inline void
 166print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)
 167{
 168}
 169#endif
 170
 171/*
 172 * Task state bitmask. NOTE! These bits are also
 173 * encoded in fs/proc/array.c: get_task_state().
 174 *
 175 * We have two separate sets of flags: task->state
 176 * is about runnability, while task->exit_state are
 177 * about the task exiting. Confusing, but this way
 178 * modifying one set can't modify the other one by
 179 * mistake.
 180 */
 181#define TASK_RUNNING            0
 182#define TASK_INTERRUPTIBLE      1
 183#define TASK_UNINTERRUPTIBLE    2
 184#define __TASK_STOPPED          4
 185#define __TASK_TRACED           8
 186/* in tsk->exit_state */
 187#define EXIT_ZOMBIE             16
 188#define EXIT_DEAD               32
 189/* in tsk->state again */
 190#define TASK_DEAD               64
 191#define TASK_WAKEKILL           128
 192#define TASK_WAKING             256
 193#define TASK_STATE_MAX          512
 194
 195#define TASK_STATE_TO_CHAR_STR "RSDTtZXxKW"
 196
 197extern char ___assert_task_state[1 - 2*!!(
 198                sizeof(TASK_STATE_TO_CHAR_STR)-1 != ilog2(TASK_STATE_MAX)+1)];
 199
 200/* Convenience macros for the sake of set_task_state */
 201#define TASK_KILLABLE           (TASK_WAKEKILL | TASK_UNINTERRUPTIBLE)
 202#define TASK_STOPPED            (TASK_WAKEKILL | __TASK_STOPPED)
 203#define TASK_TRACED             (TASK_WAKEKILL | __TASK_TRACED)
 204
 205/* Convenience macros for the sake of wake_up */
 206#define TASK_NORMAL             (TASK_INTERRUPTIBLE | TASK_UNINTERRUPTIBLE)
 207#define TASK_ALL                (TASK_NORMAL | __TASK_STOPPED | __TASK_TRACED)
 208
 209/* get_task_state() */
 210#define TASK_REPORT             (TASK_RUNNING | TASK_INTERRUPTIBLE | \
 211                                 TASK_UNINTERRUPTIBLE | __TASK_STOPPED | \
 212                                 __TASK_TRACED)
 213
 214#define task_is_traced(task)    ((task->state & __TASK_TRACED) != 0)
 215#define task_is_stopped(task)   ((task->state & __TASK_STOPPED) != 0)
 216#define task_is_dead(task)      ((task)->exit_state != 0)
 217#define task_is_stopped_or_traced(task) \
 218                        ((task->state & (__TASK_STOPPED | __TASK_TRACED)) != 0)
 219#define task_contributes_to_load(task)  \
 220                                ((task->state & TASK_UNINTERRUPTIBLE) != 0 && \
 221                                 (task->flags & PF_FREEZING) == 0)
 222
 223#define __set_task_state(tsk, state_value)              \
 224        do { (tsk)->state = (state_value); } while (0)
 225#define set_task_state(tsk, state_value)                \
 226        set_mb((tsk)->state, (state_value))
 227
 228/*
 229 * set_current_state() includes a barrier so that the write of current->state
 230 * is correctly serialised wrt the caller's subsequent test of whether to
 231 * actually sleep:
 232 *
 233 *      set_current_state(TASK_UNINTERRUPTIBLE);
 234 *      if (do_i_need_to_sleep())
 235 *              schedule();
 236 *
 237 * If the caller does not need such serialisation then use __set_current_state()
 238 */
 239#define __set_current_state(state_value)                        \
 240        do { current->state = (state_value); } while (0)
 241#define set_current_state(state_value)          \
 242        set_mb(current->state, (state_value))
 243
 244/* Task command name length */
 245#define TASK_COMM_LEN 16
 246
 247#include <linux/spinlock.h>
 248
 249/*
 250 * This serializes "schedule()" and also protects
 251 * the run-queue from deletions/modifications (but
 252 * _adding_ to the beginning of the run-queue has
 253 * a separate lock).
 254 */
 255extern rwlock_t tasklist_lock;
 256extern spinlock_t mmlist_lock;
 257
 258struct task_struct;
 259
 260#ifdef CONFIG_PROVE_RCU
 261extern int lockdep_tasklist_lock_is_held(void);
 262#endif /* #ifdef CONFIG_PROVE_RCU */
 263
 264extern void sched_init(void);
 265extern void sched_init_smp(void);
 266extern asmlinkage void schedule_tail(struct task_struct *prev);
 267extern void init_idle(struct task_struct *idle, int cpu);
 268extern void init_idle_bootup_task(struct task_struct *idle);
 269
 270extern int runqueue_is_locked(int cpu);
 271
 272extern cpumask_var_t nohz_cpu_mask;
 273#if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ)
 274extern void select_nohz_load_balancer(int stop_tick);
 275extern int get_nohz_timer_target(void);
 276#else
 277static inline void select_nohz_load_balancer(int stop_tick) { }
 278#endif
 279
 280/*
 281 * Only dump TASK_* tasks. (0 for all tasks)
 282 */
 283extern void show_state_filter(unsigned long state_filter);
 284
 285static inline void show_state(void)
 286{
 287        show_state_filter(0);
 288}
 289
 290extern void show_regs(struct pt_regs *);
 291
 292/*
 293 * TASK is a pointer to the task whose backtrace we want to see (or NULL for current
 294 * task), SP is the stack pointer of the first frame that should be shown in the back
 295 * trace (or NULL if the entire call-chain of the task should be shown).
 296 */
 297extern void show_stack(struct task_struct *task, unsigned long *sp);
 298
 299void io_schedule(void);
 300long io_schedule_timeout(long timeout);
 301
 302extern void cpu_init (void);
 303extern void trap_init(void);
 304extern void update_process_times(int user);
 305extern void scheduler_tick(void);
 306
 307extern void sched_show_task(struct task_struct *p);
 308
 309#ifdef CONFIG_LOCKUP_DETECTOR
 310extern void touch_softlockup_watchdog(void);
 311extern void touch_softlockup_watchdog_sync(void);
 312extern void touch_all_softlockup_watchdogs(void);
 313extern int proc_dowatchdog_thresh(struct ctl_table *table, int write,
 314                                  void __user *buffer,
 315                                  size_t *lenp, loff_t *ppos);
 316extern unsigned int  softlockup_panic;
 317extern int softlockup_thresh;
 318void lockup_detector_init(void);
 319#else
 320static inline void touch_softlockup_watchdog(void)
 321{
 322}
 323static inline void touch_softlockup_watchdog_sync(void)
 324{
 325}
 326static inline void touch_all_softlockup_watchdogs(void)
 327{
 328}
 329static inline void lockup_detector_init(void)
 330{
 331}
 332#endif
 333
 334#ifdef CONFIG_DETECT_HUNG_TASK
 335extern unsigned int  sysctl_hung_task_panic;
 336extern unsigned long sysctl_hung_task_check_count;
 337extern unsigned long sysctl_hung_task_timeout_secs;
 338extern unsigned long sysctl_hung_task_warnings;
 339extern int proc_dohung_task_timeout_secs(struct ctl_table *table, int write,
 340                                         void __user *buffer,
 341                                         size_t *lenp, loff_t *ppos);
 342#else
 343/* Avoid need for ifdefs elsewhere in the code */
 344enum { sysctl_hung_task_timeout_secs = 0 };
 345#endif
 346
 347/* Attach to any functions which should be ignored in wchan output. */
 348#define __sched         __attribute__((__section__(".sched.text")))
 349
 350/* Linker adds these: start and end of __sched functions */
 351extern char __sched_text_start[], __sched_text_end[];
 352
 353/* Is this address in the __sched functions? */
 354extern int in_sched_functions(unsigned long addr);
 355
 356#define MAX_SCHEDULE_TIMEOUT    LONG_MAX
 357extern signed long schedule_timeout(signed long timeout);
 358extern signed long schedule_timeout_interruptible(signed long timeout);
 359extern signed long schedule_timeout_killable(signed long timeout);
 360extern signed long schedule_timeout_uninterruptible(signed long timeout);
 361asmlinkage void schedule(void);
 362extern int mutex_spin_on_owner(struct mutex *lock, struct thread_info *owner);
 363
 364struct nsproxy;
 365struct user_namespace;
 366
 367/*
 368 * Default maximum number of active map areas, this limits the number of vmas
 369 * per mm struct. Users can overwrite this number by sysctl but there is a
 370 * problem.
 371 *
 372 * When a program's coredump is generated as ELF format, a section is created
 373 * per a vma. In ELF, the number of sections is represented in unsigned short.
 374 * This means the number of sections should be smaller than 65535 at coredump.
 375 * Because the kernel adds some informative sections to a image of program at
 376 * generating coredump, we need some margin. The number of extra sections is
 377 * 1-3 now and depends on arch. We use "5" as safe margin, here.
 378 */
 379#define MAPCOUNT_ELF_CORE_MARGIN        (5)
 380#define DEFAULT_MAX_MAP_COUNT   (USHRT_MAX - MAPCOUNT_ELF_CORE_MARGIN)
 381
 382extern int sysctl_max_map_count;
 383
 384#include <linux/aio.h>
 385
 386#ifdef CONFIG_MMU
 387extern void arch_pick_mmap_layout(struct mm_struct *mm);
 388extern unsigned long
 389arch_get_unmapped_area(struct file *, unsigned long, unsigned long,
 390                       unsigned long, unsigned long);
 391extern unsigned long
 392arch_get_unmapped_area_topdown(struct file *filp, unsigned long addr,
 393                          unsigned long len, unsigned long pgoff,
 394                          unsigned long flags);
 395extern void arch_unmap_area(struct mm_struct *, unsigned long);
 396extern void arch_unmap_area_topdown(struct mm_struct *, unsigned long);
 397#else
 398static inline void arch_pick_mmap_layout(struct mm_struct *mm) {}
 399#endif
 400
 401
 402extern void set_dumpable(struct mm_struct *mm, int value);
 403extern int get_dumpable(struct mm_struct *mm);
 404
 405/* mm flags */
 406/* dumpable bits */
 407#define MMF_DUMPABLE      0  /* core dump is permitted */
 408#define MMF_DUMP_SECURELY 1  /* core file is readable only by root */
 409
 410#define MMF_DUMPABLE_BITS 2
 411#define MMF_DUMPABLE_MASK ((1 << MMF_DUMPABLE_BITS) - 1)
 412
 413/* coredump filter bits */
 414#define MMF_DUMP_ANON_PRIVATE   2
 415#define MMF_DUMP_ANON_SHARED    3
 416#define MMF_DUMP_MAPPED_PRIVATE 4
 417#define MMF_DUMP_MAPPED_SHARED  5
 418#define MMF_DUMP_ELF_HEADERS    6
 419#define MMF_DUMP_HUGETLB_PRIVATE 7
 420#define MMF_DUMP_HUGETLB_SHARED  8
 421
 422#define MMF_DUMP_FILTER_SHIFT   MMF_DUMPABLE_BITS
 423#define MMF_DUMP_FILTER_BITS    7
 424#define MMF_DUMP_FILTER_MASK \
 425        (((1 << MMF_DUMP_FILTER_BITS) - 1) << MMF_DUMP_FILTER_SHIFT)
 426#define MMF_DUMP_FILTER_DEFAULT \
 427        ((1 << MMF_DUMP_ANON_PRIVATE) | (1 << MMF_DUMP_ANON_SHARED) |\
 428         (1 << MMF_DUMP_HUGETLB_PRIVATE) | MMF_DUMP_MASK_DEFAULT_ELF)
 429
 430#ifdef CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS
 431# define MMF_DUMP_MASK_DEFAULT_ELF      (1 << MMF_DUMP_ELF_HEADERS)
 432#else
 433# define MMF_DUMP_MASK_DEFAULT_ELF      0
 434#endif
 435                                        /* leave room for more dump flags */
 436#define MMF_VM_MERGEABLE        16      /* KSM may merge identical pages */
 437#define MMF_VM_HUGEPAGE         17      /* set when VM_HUGEPAGE is set on vma */
 438
 439#define MMF_INIT_MASK           (MMF_DUMPABLE_MASK | MMF_DUMP_FILTER_MASK)
 440
 441struct sighand_struct {
 442        atomic_t                count;
 443        struct k_sigaction      action[_NSIG];
 444        spinlock_t              siglock;
 445        wait_queue_head_t       signalfd_wqh;
 446};
 447
 448struct pacct_struct {
 449        int                     ac_flag;
 450        long                    ac_exitcode;
 451        unsigned long           ac_mem;
 452        cputime_t               ac_utime, ac_stime;
 453        unsigned long           ac_minflt, ac_majflt;
 454};
 455
 456struct cpu_itimer {
 457        cputime_t expires;
 458        cputime_t incr;
 459        u32 error;
 460        u32 incr_error;
 461};
 462
 463/**
 464 * struct task_cputime - collected CPU time counts
 465 * @utime:              time spent in user mode, in &cputime_t units
 466 * @stime:              time spent in kernel mode, in &cputime_t units
 467 * @sum_exec_runtime:   total time spent on the CPU, in nanoseconds
 468 *
 469 * This structure groups together three kinds of CPU time that are
 470 * tracked for threads and thread groups.  Most things considering
 471 * CPU time want to group these counts together and treat all three
 472 * of them in parallel.
 473 */
 474struct task_cputime {
 475        cputime_t utime;
 476        cputime_t stime;
 477        unsigned long long sum_exec_runtime;
 478};
 479/* Alternate field names when used to cache expirations. */
 480#define prof_exp        stime
 481#define virt_exp        utime
 482#define sched_exp       sum_exec_runtime
 483
 484#define INIT_CPUTIME    \
 485        (struct task_cputime) {                                 \
 486                .utime = cputime_zero,                          \
 487                .stime = cputime_zero,                          \
 488                .sum_exec_runtime = 0,                          \
 489        }
 490
 491/*
 492 * Disable preemption until the scheduler is running.
 493 * Reset by start_kernel()->sched_init()->init_idle().
 494 *
 495 * We include PREEMPT_ACTIVE to avoid cond_resched() from working
 496 * before the scheduler is active -- see should_resched().
 497 */
 498#define INIT_PREEMPT_COUNT      (1 + PREEMPT_ACTIVE)
 499
 500/**
 501 * struct thread_group_cputimer - thread group interval timer counts
 502 * @cputime:            thread group interval timers.
 503 * @running:            non-zero when there are timers running and
 504 *                      @cputime receives updates.
 505 * @lock:               lock for fields in this struct.
 506 *
 507 * This structure contains the version of task_cputime, above, that is
 508 * used for thread group CPU timer calculations.
 509 */
 510struct thread_group_cputimer {
 511        struct task_cputime cputime;
 512        int running;
 513        spinlock_t lock;
 514};
 515
 516struct autogroup;
 517
 518/*
 519 * NOTE! "signal_struct" does not have it's own
 520 * locking, because a shared signal_struct always
 521 * implies a shared sighand_struct, so locking
 522 * sighand_struct is always a proper superset of
 523 * the locking of signal_struct.
 524 */
 525struct signal_struct {
 526        atomic_t                sigcnt;
 527        atomic_t                live;
 528        int                     nr_threads;
 529
 530        wait_queue_head_t       wait_chldexit;  /* for wait4() */
 531
 532        /* current thread group signal load-balancing target: */
 533        struct task_struct      *curr_target;
 534
 535        /* shared signal handling: */
 536        struct sigpending       shared_pending;
 537
 538        /* thread group exit support */
 539        int                     group_exit_code;
 540        /* overloaded:
 541         * - notify group_exit_task when ->count is equal to notify_count
 542         * - everyone except group_exit_task is stopped during signal delivery
 543         *   of fatal signals, group_exit_task processes the signal.
 544         */
 545        int                     notify_count;
 546        struct task_struct      *group_exit_task;
 547
 548        /* thread group stop support, overloads group_exit_code too */
 549        int                     group_stop_count;
 550        unsigned int            flags; /* see SIGNAL_* flags below */
 551
 552        /* POSIX.1b Interval Timers */
 553        struct list_head posix_timers;
 554
 555        /* ITIMER_REAL timer for the process */
 556        struct hrtimer real_timer;
 557        struct pid *leader_pid;
 558        ktime_t it_real_incr;
 559
 560        /*
 561         * ITIMER_PROF and ITIMER_VIRTUAL timers for the process, we use
 562         * CPUCLOCK_PROF and CPUCLOCK_VIRT for indexing array as these
 563         * values are defined to 0 and 1 respectively
 564         */
 565        struct cpu_itimer it[2];
 566
 567        /*
 568         * Thread group totals for process CPU timers.
 569         * See thread_group_cputimer(), et al, for details.
 570         */
 571        struct thread_group_cputimer cputimer;
 572
 573        /* Earliest-expiration cache. */
 574        struct task_cputime cputime_expires;
 575
 576        struct list_head cpu_timers[3];
 577
 578        struct pid *tty_old_pgrp;
 579
 580        /* boolean value for session group leader */
 581        int leader;
 582
 583        struct tty_struct *tty; /* NULL if no tty */
 584
 585#ifdef CONFIG_SCHED_AUTOGROUP
 586        struct autogroup *autogroup;
 587#endif
 588        /*
 589         * Cumulative resource counters for dead threads in the group,
 590         * and for reaped dead child processes forked by this group.
 591         * Live threads maintain their own counters and add to these
 592         * in __exit_signal, except for the group leader.
 593         */
 594        cputime_t utime, stime, cutime, cstime;
 595        cputime_t gtime;
 596        cputime_t cgtime;
 597#ifndef CONFIG_VIRT_CPU_ACCOUNTING
 598        cputime_t prev_utime, prev_stime;
 599#endif
 600        unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw;
 601        unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt;
 602        unsigned long inblock, oublock, cinblock, coublock;
 603        unsigned long maxrss, cmaxrss;
 604        struct task_io_accounting ioac;
 605
 606        /*
 607         * Cumulative ns of schedule CPU time fo dead threads in the
 608         * group, not including a zombie group leader, (This only differs
 609         * from jiffies_to_ns(utime + stime) if sched_clock uses something
 610         * other than jiffies.)
 611         */
 612        unsigned long long sum_sched_runtime;
 613
 614        /*
 615         * We don't bother to synchronize most readers of this at all,
 616         * because there is no reader checking a limit that actually needs
 617         * to get both rlim_cur and rlim_max atomically, and either one
 618         * alone is a single word that can safely be read normally.
 619         * getrlimit/setrlimit use task_lock(current->group_leader) to
 620         * protect this instead of the siglock, because they really
 621         * have no need to disable irqs.
 622         */
 623        struct rlimit rlim[RLIM_NLIMITS];
 624
 625#ifdef CONFIG_BSD_PROCESS_ACCT
 626        struct pacct_struct pacct;      /* per-process accounting information */
 627#endif
 628#ifdef CONFIG_TASKSTATS
 629        struct taskstats *stats;
 630#endif
 631#ifdef CONFIG_AUDIT
 632        unsigned audit_tty;
 633        struct tty_audit_buf *tty_audit_buf;
 634#endif
 635
 636        int oom_adj;            /* OOM kill score adjustment (bit shift) */
 637        int oom_score_adj;      /* OOM kill score adjustment */
 638        int oom_score_adj_min;  /* OOM kill score adjustment minimum value.
 639                                 * Only settable by CAP_SYS_RESOURCE. */
 640
 641        struct mutex cred_guard_mutex;  /* guard against foreign influences on
 642                                         * credential calculations
 643                                         * (notably. ptrace) */
 644};
 645
 646/* Context switch must be unlocked if interrupts are to be enabled */
 647#ifdef __ARCH_WANT_INTERRUPTS_ON_CTXSW
 648# define __ARCH_WANT_UNLOCKED_CTXSW
 649#endif
 650
 651/*
 652 * Bits in flags field of signal_struct.
 653 */
 654#define SIGNAL_STOP_STOPPED     0x00000001 /* job control stop in effect */
 655#define SIGNAL_STOP_DEQUEUED    0x00000002 /* stop signal dequeued */
 656#define SIGNAL_STOP_CONTINUED   0x00000004 /* SIGCONT since WCONTINUED reap */
 657#define SIGNAL_GROUP_EXIT       0x00000008 /* group exit in progress */
 658/*
 659 * Pending notifications to parent.
 660 */
 661#define SIGNAL_CLD_STOPPED      0x00000010
 662#define SIGNAL_CLD_CONTINUED    0x00000020
 663#define SIGNAL_CLD_MASK         (SIGNAL_CLD_STOPPED|SIGNAL_CLD_CONTINUED)
 664
 665#define SIGNAL_UNKILLABLE       0x00000040 /* for init: ignore fatal signals */
 666
 667/* If true, all threads except ->group_exit_task have pending SIGKILL */
 668static inline int signal_group_exit(const struct signal_struct *sig)
 669{
 670        return  (sig->flags & SIGNAL_GROUP_EXIT) ||
 671                (sig->group_exit_task != NULL);
 672}
 673
 674/*
 675 * Some day this will be a full-fledged user tracking system..
 676 */
 677struct user_struct {
 678        atomic_t __count;       /* reference count */
 679        atomic_t processes;     /* How many processes does this user have? */
 680        atomic_t files;         /* How many open files does this user have? */
 681        atomic_t sigpending;    /* How many pending signals does this user have? */
 682#ifdef CONFIG_INOTIFY_USER
 683        atomic_t inotify_watches; /* How many inotify watches does this user have? */
 684        atomic_t inotify_devs;  /* How many inotify devs does this user have opened? */
 685#endif
 686#ifdef CONFIG_FANOTIFY
 687        atomic_t fanotify_listeners;
 688#endif
 689#ifdef CONFIG_EPOLL
 690        atomic_long_t epoll_watches; /* The number of file descriptors currently watched */
 691#endif
 692#ifdef CONFIG_POSIX_MQUEUE
 693        /* protected by mq_lock */
 694        unsigned long mq_bytes; /* How many bytes can be allocated to mqueue? */
 695#endif
 696        unsigned long locked_shm; /* How many pages of mlocked shm ? */
 697
 698#ifdef CONFIG_KEYS
 699        struct key *uid_keyring;        /* UID specific keyring */
 700        struct key *session_keyring;    /* UID's default session keyring */
 701#endif
 702
 703        /* Hash table maintenance information */
 704        struct hlist_node uidhash_node;
 705        uid_t uid;
 706        struct user_namespace *user_ns;
 707
 708#ifdef CONFIG_PERF_EVENTS
 709        atomic_long_t locked_vm;
 710#endif
 711};
 712
 713extern int uids_sysfs_init(void);
 714
 715extern struct user_struct *find_user(uid_t);
 716
 717extern struct user_struct root_user;
 718#define INIT_USER (&root_user)
 719
 720
 721struct backing_dev_info;
 722struct reclaim_state;
 723
 724#if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
 725struct sched_info {
 726        /* cumulative counters */
 727        unsigned long pcount;         /* # of times run on this cpu */
 728        unsigned long long run_delay; /* time spent waiting on a runqueue */
 729
 730        /* timestamps */
 731        unsigned long long last_arrival,/* when we last ran on a cpu */
 732                           last_queued; /* when we were last queued to run */
 733#ifdef CONFIG_SCHEDSTATS
 734        /* BKL stats */
 735        unsigned int bkl_count;
 736#endif
 737};
 738#endif /* defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) */
 739
 740#ifdef CONFIG_TASK_DELAY_ACCT
 741struct task_delay_info {
 742        spinlock_t      lock;
 743        unsigned int    flags;  /* Private per-task flags */
 744
 745        /* For each stat XXX, add following, aligned appropriately
 746         *
 747         * struct timespec XXX_start, XXX_end;
 748         * u64 XXX_delay;
 749         * u32 XXX_count;
 750         *
 751         * Atomicity of updates to XXX_delay, XXX_count protected by
 752         * single lock above (split into XXX_lock if contention is an issue).
 753         */
 754
 755        /*
 756         * XXX_count is incremented on every XXX operation, the delay
 757         * associated with the operation is added to XXX_delay.
 758         * XXX_delay contains the accumulated delay time in nanoseconds.
 759         */
 760        struct timespec blkio_start, blkio_end; /* Shared by blkio, swapin */
 761        u64 blkio_delay;        /* wait for sync block io completion */
 762        u64 swapin_delay;       /* wait for swapin block io completion */
 763        u32 blkio_count;        /* total count of the number of sync block */
 764                                /* io operations performed */
 765        u32 swapin_count;       /* total count of the number of swapin block */
 766                                /* io operations performed */
 767
 768        struct timespec freepages_start, freepages_end;
 769        u64 freepages_delay;    /* wait for memory reclaim */
 770        u32 freepages_count;    /* total count of memory reclaim */
 771};
 772#endif  /* CONFIG_TASK_DELAY_ACCT */
 773
 774static inline int sched_info_on(void)
 775{
 776#ifdef CONFIG_SCHEDSTATS
 777        return 1;
 778#elif defined(CONFIG_TASK_DELAY_ACCT)
 779        extern int delayacct_on;
 780        return delayacct_on;
 781#else
 782        return 0;
 783#endif
 784}
 785
 786enum cpu_idle_type {
 787        CPU_IDLE,
 788        CPU_NOT_IDLE,
 789        CPU_NEWLY_IDLE,
 790        CPU_MAX_IDLE_TYPES
 791};
 792
 793/*
 794 * sched-domains (multiprocessor balancing) declarations:
 795 */
 796
 797/*
 798 * Increase resolution of nice-level calculations:
 799 */
 800#define SCHED_LOAD_SHIFT        10
 801#define SCHED_LOAD_SCALE        (1L << SCHED_LOAD_SHIFT)
 802
 803#define SCHED_LOAD_SCALE_FUZZ   SCHED_LOAD_SCALE
 804
 805#ifdef CONFIG_SMP
 806#define SD_LOAD_BALANCE         0x0001  /* Do load balancing on this domain. */
 807#define SD_BALANCE_NEWIDLE      0x0002  /* Balance when about to become idle */
 808#define SD_BALANCE_EXEC         0x0004  /* Balance on exec */
 809#define SD_BALANCE_FORK         0x0008  /* Balance on fork, clone */
 810#define SD_BALANCE_WAKE         0x0010  /* Balance on wakeup */
 811#define SD_WAKE_AFFINE          0x0020  /* Wake task to waking CPU */
 812#define SD_PREFER_LOCAL         0x0040  /* Prefer to keep tasks local to this domain */
 813#define SD_SHARE_CPUPOWER       0x0080  /* Domain members share cpu power */
 814#define SD_POWERSAVINGS_BALANCE 0x0100  /* Balance for power savings */
 815#define SD_SHARE_PKG_RESOURCES  0x0200  /* Domain members share cpu pkg resources */
 816#define SD_SERIALIZE            0x0400  /* Only a single load balancing instance */
 817#define SD_ASYM_PACKING         0x0800  /* Place busy groups earlier in the domain */
 818#define SD_PREFER_SIBLING       0x1000  /* Prefer to place tasks in a sibling domain */
 819
 820enum powersavings_balance_level {
 821        POWERSAVINGS_BALANCE_NONE = 0,  /* No power saving load balance */
 822        POWERSAVINGS_BALANCE_BASIC,     /* Fill one thread/core/package
 823                                         * first for long running threads
 824                                         */
 825        POWERSAVINGS_BALANCE_WAKEUP,    /* Also bias task wakeups to semi-idle
 826                                         * cpu package for power savings
 827                                         */
 828        MAX_POWERSAVINGS_BALANCE_LEVELS
 829};
 830
 831extern int sched_mc_power_savings, sched_smt_power_savings;
 832
 833static inline int sd_balance_for_mc_power(void)
 834{
 835        if (sched_smt_power_savings)
 836                return SD_POWERSAVINGS_BALANCE;
 837
 838        if (!sched_mc_power_savings)
 839                return SD_PREFER_SIBLING;
 840
 841        return 0;
 842}
 843
 844static inline int sd_balance_for_package_power(void)
 845{
 846        if (sched_mc_power_savings | sched_smt_power_savings)
 847                return SD_POWERSAVINGS_BALANCE;
 848
 849        return SD_PREFER_SIBLING;
 850}
 851
 852extern int __weak arch_sd_sibiling_asym_packing(void);
 853
 854/*
 855 * Optimise SD flags for power savings:
 856 * SD_BALANCE_NEWIDLE helps agressive task consolidation and power savings.
 857 * Keep default SD flags if sched_{smt,mc}_power_saving=0
 858 */
 859
 860static inline int sd_power_saving_flags(void)
 861{
 862        if (sched_mc_power_savings | sched_smt_power_savings)
 863                return SD_BALANCE_NEWIDLE;
 864
 865        return 0;
 866}
 867
 868struct sched_group {
 869        struct sched_group *next;       /* Must be a circular list */
 870
 871        /*
 872         * CPU power of this group, SCHED_LOAD_SCALE being max power for a
 873         * single CPU.
 874         */
 875        unsigned int cpu_power, cpu_power_orig;
 876        unsigned int group_weight;
 877
 878        /*
 879         * The CPUs this group covers.
 880         *
 881         * NOTE: this field is variable length. (Allocated dynamically
 882         * by attaching extra space to the end of the structure,
 883         * depending on how many CPUs the kernel has booted up with)
 884         *
 885         * It is also be embedded into static data structures at build
 886         * time. (See 'struct static_sched_group' in kernel/sched.c)
 887         */
 888        unsigned long cpumask[0];
 889};
 890
 891static inline struct cpumask *sched_group_cpus(struct sched_group *sg)
 892{
 893        return to_cpumask(sg->cpumask);
 894}
 895
 896enum sched_domain_level {
 897        SD_LV_NONE = 0,
 898        SD_LV_SIBLING,
 899        SD_LV_MC,
 900        SD_LV_BOOK,
 901        SD_LV_CPU,
 902        SD_LV_NODE,
 903        SD_LV_ALLNODES,
 904        SD_LV_MAX
 905};
 906
 907struct sched_domain_attr {
 908        int relax_domain_level;
 909};
 910
 911#define SD_ATTR_INIT    (struct sched_domain_attr) {    \
 912        .relax_domain_level = -1,                       \
 913}
 914
 915struct sched_domain {
 916        /* These fields must be setup */
 917        struct sched_domain *parent;    /* top domain must be null terminated */
 918        struct sched_domain *child;     /* bottom domain must be null terminated */
 919        struct sched_group *groups;     /* the balancing groups of the domain */
 920        unsigned long min_interval;     /* Minimum balance interval ms */
 921        unsigned long max_interval;     /* Maximum balance interval ms */
 922        unsigned int busy_factor;       /* less balancing by factor if busy */
 923        unsigned int imbalance_pct;     /* No balance until over watermark */
 924        unsigned int cache_nice_tries;  /* Leave cache hot tasks for # tries */
 925        unsigned int busy_idx;
 926        unsigned int idle_idx;
 927        unsigned int newidle_idx;
 928        unsigned int wake_idx;
 929        unsigned int forkexec_idx;
 930        unsigned int smt_gain;
 931        int flags;                      /* See SD_* */
 932        enum sched_domain_level level;
 933
 934        /* Runtime fields. */
 935        unsigned long last_balance;     /* init to jiffies. units in jiffies */
 936        unsigned int balance_interval;  /* initialise to 1. units in ms. */
 937        unsigned int nr_balance_failed; /* initialise to 0 */
 938
 939        u64 last_update;
 940
 941#ifdef CONFIG_SCHEDSTATS
 942        /* load_balance() stats */
 943        unsigned int lb_count[CPU_MAX_IDLE_TYPES];
 944        unsigned int lb_failed[CPU_MAX_IDLE_TYPES];
 945        unsigned int lb_balanced[CPU_MAX_IDLE_TYPES];
 946        unsigned int lb_imbalance[CPU_MAX_IDLE_TYPES];
 947        unsigned int lb_gained[CPU_MAX_IDLE_TYPES];
 948        unsigned int lb_hot_gained[CPU_MAX_IDLE_TYPES];
 949        unsigned int lb_nobusyg[CPU_MAX_IDLE_TYPES];
 950        unsigned int lb_nobusyq[CPU_MAX_IDLE_TYPES];
 951
 952        /* Active load balancing */
 953        unsigned int alb_count;
 954        unsigned int alb_failed;
 955        unsigned int alb_pushed;
 956
 957        /* SD_BALANCE_EXEC stats */
 958        unsigned int sbe_count;
 959        unsigned int sbe_balanced;
 960        unsigned int sbe_pushed;
 961
 962        /* SD_BALANCE_FORK stats */
 963        unsigned int sbf_count;
 964        unsigned int sbf_balanced;
 965        unsigned int sbf_pushed;
 966
 967        /* try_to_wake_up() stats */
 968        unsigned int ttwu_wake_remote;
 969        unsigned int ttwu_move_affine;
 970        unsigned int ttwu_move_balance;
 971#endif
 972#ifdef CONFIG_SCHED_DEBUG
 973        char *name;
 974#endif
 975
 976        unsigned int span_weight;
 977        /*
 978         * Span of all CPUs in this domain.
 979         *
 980         * NOTE: this field is variable length. (Allocated dynamically
 981         * by attaching extra space to the end of the structure,
 982         * depending on how many CPUs the kernel has booted up with)
 983         *
 984         * It is also be embedded into static data structures at build
 985         * time. (See 'struct static_sched_domain' in kernel/sched.c)
 986         */
 987        unsigned long span[0];
 988};
 989
 990static inline struct cpumask *sched_domain_span(struct sched_domain *sd)
 991{
 992        return to_cpumask(sd->span);
 993}
 994
 995extern void partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[],
 996                                    struct sched_domain_attr *dattr_new);
 997
 998/* Allocate an array of sched domains, for partition_sched_domains(). */
 999cpumask_var_t *alloc_sched_domains(unsigned int ndoms);
1000void free_sched_domains(cpumask_var_t doms[], unsigned int ndoms);
1001
1002/* Test a flag in parent sched domain */
1003static inline int test_sd_parent(struct sched_domain *sd, int flag)
1004{
1005        if (sd->parent && (sd->parent->flags & flag))
1006                return 1;
1007
1008        return 0;
1009}
1010
1011unsigned long default_scale_freq_power(struct sched_domain *sd, int cpu);
1012unsigned long default_scale_smt_power(struct sched_domain *sd, int cpu);
1013
1014#else /* CONFIG_SMP */
1015
1016struct sched_domain_attr;
1017
1018static inline void
1019partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[],
1020                        struct sched_domain_attr *dattr_new)
1021{
1022}
1023#endif  /* !CONFIG_SMP */
1024
1025
1026struct io_context;                      /* See blkdev.h */
1027
1028
1029#ifdef ARCH_HAS_PREFETCH_SWITCH_STACK
1030extern void prefetch_stack(struct task_struct *t);
1031#else
1032static inline void prefetch_stack(struct task_struct *t) { }
1033#endif
1034
1035struct audit_context;           /* See audit.c */
1036struct mempolicy;
1037struct pipe_inode_info;
1038struct uts_namespace;
1039
1040struct rq;
1041struct sched_domain;
1042
1043/*
1044 * wake flags
1045 */
1046#define WF_SYNC         0x01            /* waker goes to sleep after wakup */
1047#define WF_FORK         0x02            /* child wakeup after fork */
1048
1049#define ENQUEUE_WAKEUP          1
1050#define ENQUEUE_WAKING          2
1051#define ENQUEUE_HEAD            4
1052
1053#define DEQUEUE_SLEEP           1
1054
1055struct sched_class {
1056        const struct sched_class *next;
1057
1058        void (*enqueue_task) (struct rq *rq, struct task_struct *p, int flags);
1059        void (*dequeue_task) (struct rq *rq, struct task_struct *p, int flags);
1060        void (*yield_task) (struct rq *rq);
1061
1062        void (*check_preempt_curr) (struct rq *rq, struct task_struct *p, int flags);
1063
1064        struct task_struct * (*pick_next_task) (struct rq *rq);
1065        void (*put_prev_task) (struct rq *rq, struct task_struct *p);
1066
1067#ifdef CONFIG_SMP
1068        int  (*select_task_rq)(struct rq *rq, struct task_struct *p,
1069                               int sd_flag, int flags);
1070
1071        void (*pre_schedule) (struct rq *this_rq, struct task_struct *task);
1072        void (*post_schedule) (struct rq *this_rq);
1073        void (*task_waking) (struct rq *this_rq, struct task_struct *task);
1074        void (*task_woken) (struct rq *this_rq, struct task_struct *task);
1075
1076        void (*set_cpus_allowed)(struct task_struct *p,
1077                                 const struct cpumask *newmask);
1078
1079        void (*rq_online)(struct rq *rq);
1080        void (*rq_offline)(struct rq *rq);
1081#endif
1082
1083        void (*set_curr_task) (struct rq *rq);
1084        void (*task_tick) (struct rq *rq, struct task_struct *p, int queued);
1085        void (*task_fork) (struct task_struct *p);
1086
1087        void (*switched_from) (struct rq *this_rq, struct task_struct *task,
1088                               int running);
1089        void (*switched_to) (struct rq *this_rq, struct task_struct *task,
1090                             int running);
1091        void (*prio_changed) (struct rq *this_rq, struct task_struct *task,
1092                             int oldprio, int running);
1093
1094        unsigned int (*get_rr_interval) (struct rq *rq,
1095                                         struct task_struct *task);
1096
1097#ifdef CONFIG_FAIR_GROUP_SCHED
1098        void (*task_move_group) (struct task_struct *p, int on_rq);
1099#endif
1100};
1101
1102struct load_weight {
1103        unsigned long weight, inv_weight;
1104};
1105
1106#ifdef CONFIG_SCHEDSTATS
1107struct sched_statistics {
1108        u64                     wait_start;
1109        u64                     wait_max;
1110        u64                     wait_count;
1111        u64                     wait_sum;
1112        u64                     iowait_count;
1113        u64                     iowait_sum;
1114
1115        u64                     sleep_start;
1116        u64                     sleep_max;
1117        s64                     sum_sleep_runtime;
1118
1119        u64                     block_start;
1120        u64                     block_max;
1121        u64                     exec_max;
1122        u64                     slice_max;
1123
1124        u64                     nr_migrations_cold;
1125        u64                     nr_failed_migrations_affine;
1126        u64                     nr_failed_migrations_running;
1127        u64                     nr_failed_migrations_hot;
1128        u64                     nr_forced_migrations;
1129
1130        u64                     nr_wakeups;
1131        u64                     nr_wakeups_sync;
1132        u64                     nr_wakeups_migrate;
1133        u64                     nr_wakeups_local;
1134        u64                     nr_wakeups_remote;
1135        u64                     nr_wakeups_affine;
1136        u64                     nr_wakeups_affine_attempts;
1137        u64                     nr_wakeups_passive;
1138        u64                     nr_wakeups_idle;
1139};
1140#endif
1141
1142struct sched_entity {
1143        struct load_weight      load;           /* for load-balancing */
1144        struct rb_node          run_node;
1145        struct list_head        group_node;
1146        unsigned int            on_rq;
1147
1148        u64                     exec_start;
1149        u64                     sum_exec_runtime;
1150        u64                     vruntime;
1151        u64                     prev_sum_exec_runtime;
1152
1153        u64                     nr_migrations;
1154
1155#ifdef CONFIG_SCHEDSTATS
1156        struct sched_statistics statistics;
1157#endif
1158
1159#ifdef CONFIG_FAIR_GROUP_SCHED
1160        struct sched_entity     *parent;
1161        /* rq on which this entity is (to be) queued: */
1162        struct cfs_rq           *cfs_rq;
1163        /* rq "owned" by this entity/group: */
1164        struct cfs_rq           *my_q;
1165#endif
1166};
1167
1168struct sched_rt_entity {
1169        struct list_head run_list;
1170        unsigned long timeout;
1171        unsigned int time_slice;
1172        int nr_cpus_allowed;
1173
1174        struct sched_rt_entity *back;
1175#ifdef CONFIG_RT_GROUP_SCHED
1176        struct sched_rt_entity  *parent;
1177        /* rq on which this entity is (to be) queued: */
1178        struct rt_rq            *rt_rq;
1179        /* rq "owned" by this entity/group: */
1180        struct rt_rq            *my_q;
1181#endif
1182};
1183
1184struct rcu_node;
1185
1186enum perf_event_task_context {
1187        perf_invalid_context = -1,
1188        perf_hw_context = 0,
1189        perf_sw_context,
1190        perf_nr_task_contexts,
1191};
1192
1193struct task_struct {
1194        volatile long state;    /* -1 unrunnable, 0 runnable, >0 stopped */
1195        void *stack;
1196        atomic_t usage;
1197        unsigned int flags;     /* per process flags, defined below */
1198        unsigned int ptrace;
1199
1200        int lock_depth;         /* BKL lock depth */
1201
1202#ifdef CONFIG_SMP
1203#ifdef __ARCH_WANT_UNLOCKED_CTXSW
1204        int oncpu;
1205#endif
1206#endif
1207
1208        int prio, static_prio, normal_prio;
1209        unsigned int rt_priority;
1210        const struct sched_class *sched_class;
1211        struct sched_entity se;
1212        struct sched_rt_entity rt;
1213
1214#ifdef CONFIG_PREEMPT_NOTIFIERS
1215        /* list of struct preempt_notifier: */
1216        struct hlist_head preempt_notifiers;
1217#endif
1218
1219        /*
1220         * fpu_counter contains the number of consecutive context switches
1221         * that the FPU is used. If this is over a threshold, the lazy fpu
1222         * saving becomes unlazy to save the trap. This is an unsigned char
1223         * so that after 256 times the counter wraps and the behavior turns
1224         * lazy again; this to deal with bursty apps that only use FPU for
1225         * a short time
1226         */
1227        unsigned char fpu_counter;
1228#ifdef CONFIG_BLK_DEV_IO_TRACE
1229        unsigned int btrace_seq;
1230#endif
1231
1232        unsigned int policy;
1233        cpumask_t cpus_allowed;
1234
1235#ifdef CONFIG_PREEMPT_RCU
1236        int rcu_read_lock_nesting;
1237        char rcu_read_unlock_special;
1238        struct list_head rcu_node_entry;
1239#endif /* #ifdef CONFIG_PREEMPT_RCU */
1240#ifdef CONFIG_TREE_PREEMPT_RCU
1241        struct rcu_node *rcu_blocked_node;
1242#endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */
1243#ifdef CONFIG_RCU_BOOST
1244        struct rt_mutex *rcu_boost_mutex;
1245#endif /* #ifdef CONFIG_RCU_BOOST */
1246
1247#if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
1248        struct sched_info sched_info;
1249#endif
1250
1251        struct list_head tasks;
1252#ifdef CONFIG_SMP
1253        struct plist_node pushable_tasks;
1254#endif
1255
1256        struct mm_struct *mm, *active_mm;
1257#ifdef CONFIG_COMPAT_BRK
1258        unsigned brk_randomized:1;
1259#endif
1260#if defined(SPLIT_RSS_COUNTING)
1261        struct task_rss_stat    rss_stat;
1262#endif
1263/* task state */
1264        int exit_state;
1265        int exit_code, exit_signal;
1266        int pdeath_signal;  /*  The signal sent when the parent dies  */
1267        /* ??? */
1268        unsigned int personality;
1269        unsigned did_exec:1;
1270        unsigned in_execve:1;   /* Tell the LSMs that the process is doing an
1271                                 * execve */
1272        unsigned in_iowait:1;
1273
1274
1275        /* Revert to default priority/policy when forking */
1276        unsigned sched_reset_on_fork:1;
1277
1278        pid_t pid;
1279        pid_t tgid;
1280
1281#ifdef CONFIG_CC_STACKPROTECTOR
1282        /* Canary value for the -fstack-protector gcc feature */
1283        unsigned long stack_canary;
1284#endif
1285
1286        /* 
1287         * pointers to (original) parent process, youngest child, younger sibling,
1288         * older sibling, respectively.  (p->father can be replaced with 
1289         * p->real_parent->pid)
1290         */
1291        struct task_struct *real_parent; /* real parent process */
1292        struct task_struct *parent; /* recipient of SIGCHLD, wait4() reports */
1293        /*
1294         * children/sibling forms the list of my natural children
1295         */
1296        struct list_head children;      /* list of my children */
1297        struct list_head sibling;       /* linkage in my parent's children list */
1298        struct task_struct *group_leader;       /* threadgroup leader */
1299
1300        /*
1301         * ptraced is the list of tasks this task is using ptrace on.
1302         * This includes both natural children and PTRACE_ATTACH targets.
1303         * p->ptrace_entry is p's link on the p->parent->ptraced list.
1304         */
1305        struct list_head ptraced;
1306        struct list_head ptrace_entry;
1307
1308        /* PID/PID hash table linkage. */
1309        struct pid_link pids[PIDTYPE_MAX];
1310        struct list_head thread_group;
1311
1312        struct completion *vfork_done;          /* for vfork() */
1313        int __user *set_child_tid;              /* CLONE_CHILD_SETTID */
1314        int __user *clear_child_tid;            /* CLONE_CHILD_CLEARTID */
1315
1316        cputime_t utime, stime, utimescaled, stimescaled;
1317        cputime_t gtime;
1318#ifndef CONFIG_VIRT_CPU_ACCOUNTING
1319        cputime_t prev_utime, prev_stime;
1320#endif
1321        unsigned long nvcsw, nivcsw; /* context switch counts */
1322        struct timespec start_time;             /* monotonic time */
1323        struct timespec real_start_time;        /* boot based time */
1324/* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */
1325        unsigned long min_flt, maj_flt;
1326
1327        struct task_cputime cputime_expires;
1328        struct list_head cpu_timers[3];
1329
1330/* process credentials */
1331        const struct cred __rcu *real_cred; /* objective and real subjective task
1332                                         * credentials (COW) */
1333        const struct cred __rcu *cred;  /* effective (overridable) subjective task
1334                                         * credentials (COW) */
1335        struct cred *replacement_session_keyring; /* for KEYCTL_SESSION_TO_PARENT */
1336
1337        char comm[TASK_COMM_LEN]; /* executable name excluding path
1338                                     - access with [gs]et_task_comm (which lock
1339                                       it with task_lock())
1340                                     - initialized normally by setup_new_exec */
1341/* file system info */
1342        int link_count, total_link_count;
1343#ifdef CONFIG_SYSVIPC
1344/* ipc stuff */
1345        struct sysv_sem sysvsem;
1346#endif
1347#ifdef CONFIG_DETECT_HUNG_TASK
1348/* hung task detection */
1349        unsigned long last_switch_count;
1350#endif
1351/* CPU-specific state of this task */
1352        struct thread_struct thread;
1353/* filesystem information */
1354        struct fs_struct *fs;
1355/* open file information */
1356        struct files_struct *files;
1357/* namespaces */
1358        struct nsproxy *nsproxy;
1359/* signal handlers */
1360        struct signal_struct *signal;
1361        struct sighand_struct *sighand;
1362
1363        sigset_t blocked, real_blocked;
1364        sigset_t saved_sigmask; /* restored if set_restore_sigmask() was used */
1365        struct sigpending pending;
1366
1367        unsigned long sas_ss_sp;
1368        size_t sas_ss_size;
1369        int (*notifier)(void *priv);
1370        void *notifier_data;
1371        sigset_t *notifier_mask;
1372        struct audit_context *audit_context;
1373#ifdef CONFIG_AUDITSYSCALL
1374        uid_t loginuid;
1375        unsigned int sessionid;
1376#endif
1377        seccomp_t seccomp;
1378
1379/* Thread group tracking */
1380        u32 parent_exec_id;
1381        u32 self_exec_id;
1382/* Protection of (de-)allocation: mm, files, fs, tty, keyrings, mems_allowed,
1383 * mempolicy */
1384        spinlock_t alloc_lock;
1385
1386#ifdef CONFIG_GENERIC_HARDIRQS
1387        /* IRQ handler threads */
1388        struct irqaction *irqaction;
1389#endif
1390
1391        /* Protection of the PI data structures: */
1392        raw_spinlock_t pi_lock;
1393
1394#ifdef CONFIG_RT_MUTEXES
1395        /* PI waiters blocked on a rt_mutex held by this task */
1396        struct plist_head pi_waiters;
1397        /* Deadlock detection and priority inheritance handling */
1398        struct rt_mutex_waiter *pi_blocked_on;
1399#endif
1400
1401#ifdef CONFIG_DEBUG_MUTEXES
1402        /* mutex deadlock detection */
1403        struct mutex_waiter *blocked_on;
1404#endif
1405#ifdef CONFIG_TRACE_IRQFLAGS
1406        unsigned int irq_events;
1407        unsigned long hardirq_enable_ip;
1408        unsigned long hardirq_disable_ip;
1409        unsigned int hardirq_enable_event;
1410        unsigned int hardirq_disable_event;
1411        int hardirqs_enabled;
1412        int hardirq_context;
1413        unsigned long softirq_disable_ip;
1414        unsigned long softirq_enable_ip;
1415        unsigned int softirq_disable_event;
1416        unsigned int softirq_enable_event;
1417        int softirqs_enabled;
1418        int softirq_context;
1419#endif
1420#ifdef CONFIG_LOCKDEP
1421# define MAX_LOCK_DEPTH 48UL
1422        u64 curr_chain_key;
1423        int lockdep_depth;
1424        unsigned int lockdep_recursion;
1425        struct held_lock held_locks[MAX_LOCK_DEPTH];
1426        gfp_t lockdep_reclaim_gfp;
1427#endif
1428
1429/* journalling filesystem info */
1430        void *journal_info;
1431
1432/* stacked block device info */
1433        struct bio_list *bio_list;
1434
1435/* VM state */
1436        struct reclaim_state *reclaim_state;
1437
1438        struct backing_dev_info *backing_dev_info;
1439
1440        struct io_context *io_context;
1441
1442        unsigned long ptrace_message;
1443        siginfo_t *last_siginfo; /* For ptrace use.  */
1444        struct task_io_accounting ioac;
1445#if defined(CONFIG_TASK_XACCT)
1446        u64 acct_rss_mem1;      /* accumulated rss usage */
1447        u64 acct_vm_mem1;       /* accumulated virtual memory usage */
1448        cputime_t acct_timexpd; /* stime + utime since last update */
1449#endif
1450#ifdef CONFIG_CPUSETS
1451        nodemask_t mems_allowed;        /* Protected by alloc_lock */
1452        int mems_allowed_change_disable;
1453        int cpuset_mem_spread_rotor;
1454        int cpuset_slab_spread_rotor;
1455#endif
1456#ifdef CONFIG_CGROUPS
1457        /* Control Group info protected by css_set_lock */
1458        struct css_set __rcu *cgroups;
1459        /* cg_list protected by css_set_lock and tsk->alloc_lock */
1460        struct list_head cg_list;
1461#endif
1462#ifdef CONFIG_FUTEX
1463        struct robust_list_head __user *robust_list;
1464#ifdef CONFIG_COMPAT
1465        struct compat_robust_list_head __user *compat_robust_list;
1466#endif
1467        struct list_head pi_state_list;
1468        struct futex_pi_state *pi_state_cache;
1469#endif
1470#ifdef CONFIG_PERF_EVENTS
1471        struct perf_event_context *perf_event_ctxp[perf_nr_task_contexts];
1472        struct mutex perf_event_mutex;
1473        struct list_head perf_event_list;
1474#endif
1475#ifdef CONFIG_NUMA
1476        struct mempolicy *mempolicy;    /* Protected by alloc_lock */
1477        short il_next;
1478#endif
1479        atomic_t fs_excl;       /* holding fs exclusive resources */
1480        struct rcu_head rcu;
1481
1482        /*
1483         * cache last used pipe for splice
1484         */
1485        struct pipe_inode_info *splice_pipe;
1486#ifdef  CONFIG_TASK_DELAY_ACCT
1487        struct task_delay_info *delays;
1488#endif
1489#ifdef CONFIG_FAULT_INJECTION
1490        int make_it_fail;
1491#endif
1492        struct prop_local_single dirties;
1493#ifdef CONFIG_LATENCYTOP
1494        int latency_record_count;
1495        struct latency_record latency_record[LT_SAVECOUNT];
1496#endif
1497        /*
1498         * time slack values; these are used to round up poll() and
1499         * select() etc timeout values. These are in nanoseconds.
1500         */
1501        unsigned long timer_slack_ns;
1502        unsigned long default_timer_slack_ns;
1503
1504        struct list_head        *scm_work_list;
1505#ifdef CONFIG_FUNCTION_GRAPH_TRACER
1506        /* Index of current stored address in ret_stack */
1507        int curr_ret_stack;
1508        /* Stack of return addresses for return function tracing */
1509        struct ftrace_ret_stack *ret_stack;
1510        /* time stamp for last schedule */
1511        unsigned long long ftrace_timestamp;
1512        /*
1513         * Number of functions that haven't been traced
1514         * because of depth overrun.
1515         */
1516        atomic_t trace_overrun;
1517        /* Pause for the tracing */
1518        atomic_t tracing_graph_pause;
1519#endif
1520#ifdef CONFIG_TRACING
1521        /* state flags for use by tracers */
1522        unsigned long trace;
1523        /* bitmask of trace recursion */
1524        unsigned long trace_recursion;
1525#endif /* CONFIG_TRACING */
1526#ifdef CONFIG_CGROUP_MEM_RES_CTLR /* memcg uses this to do batch job */
1527        struct memcg_batch_info {
1528                int do_batch;   /* incremented when batch uncharge started */
1529                struct mem_cgroup *memcg; /* target memcg of uncharge */
1530                unsigned long bytes;            /* uncharged usage */
1531                unsigned long memsw_bytes; /* uncharged mem+swap usage */
1532        } memcg_batch;
1533#endif
1534#ifdef CONFIG_HAVE_HW_BREAKPOINT
1535        atomic_t ptrace_bp_refcnt;
1536#endif
1537};
1538
1539/* Future-safe accessor for struct task_struct's cpus_allowed. */
1540#define tsk_cpus_allowed(tsk) (&(tsk)->cpus_allowed)
1541
1542/*
1543 * Priority of a process goes from 0..MAX_PRIO-1, valid RT
1544 * priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL/SCHED_BATCH
1545 * tasks are in the range MAX_RT_PRIO..MAX_PRIO-1. Priority
1546 * values are inverted: lower p->prio value means higher priority.
1547 *
1548 * The MAX_USER_RT_PRIO value allows the actual maximum
1549 * RT priority to be separate from the value exported to
1550 * user-space.  This allows kernel threads to set their
1551 * priority to a value higher than any user task. Note:
1552 * MAX_RT_PRIO must not be smaller than MAX_USER_RT_PRIO.
1553 */
1554
1555#define MAX_USER_RT_PRIO        100
1556#define MAX_RT_PRIO             MAX_USER_RT_PRIO
1557
1558#define MAX_PRIO                (MAX_RT_PRIO + 40)
1559#define DEFAULT_PRIO            (MAX_RT_PRIO + 20)
1560
1561static inline int rt_prio(int prio)
1562{
1563        if (unlikely(prio < MAX_RT_PRIO))
1564                return 1;
1565        return 0;
1566}
1567
1568static inline int rt_task(struct task_struct *p)
1569{
1570        return rt_prio(p->prio);
1571}
1572
1573static inline struct pid *task_pid(struct task_struct *task)
1574{
1575        return task->pids[PIDTYPE_PID].pid;
1576}
1577
1578static inline struct pid *task_tgid(struct task_struct *task)
1579{
1580        return task->group_leader->pids[PIDTYPE_PID].pid;
1581}
1582
1583/*
1584 * Without tasklist or rcu lock it is not safe to dereference
1585 * the result of task_pgrp/task_session even if task == current,
1586 * we can race with another thread doing sys_setsid/sys_setpgid.
1587 */
1588static inline struct pid *task_pgrp(struct task_struct *task)
1589{
1590        return task->group_leader->pids[PIDTYPE_PGID].pid;
1591}
1592
1593static inline struct pid *task_session(struct task_struct *task)
1594{
1595        return task->group_leader->pids[PIDTYPE_SID].pid;
1596}
1597
1598struct pid_namespace;
1599
1600/*
1601 * the helpers to get the task's different pids as they are seen
1602 * from various namespaces
1603 *
1604 * task_xid_nr()     : global id, i.e. the id seen from the init namespace;
1605 * task_xid_vnr()    : virtual id, i.e. the id seen from the pid namespace of
1606 *                     current.
1607 * task_xid_nr_ns()  : id seen from the ns specified;
1608 *
1609 * set_task_vxid()   : assigns a virtual id to a task;
1610 *
1611 * see also pid_nr() etc in include/linux/pid.h
1612 */
1613pid_t __task_pid_nr_ns(struct task_struct *task, enum pid_type type,
1614                        struct pid_namespace *ns);
1615
1616static inline pid_t task_pid_nr(struct task_struct *tsk)
1617{
1618        return tsk->pid;
1619}
1620
1621static inline pid_t task_pid_nr_ns(struct task_struct *tsk,
1622                                        struct pid_namespace *ns)
1623{
1624        return __task_pid_nr_ns(tsk, PIDTYPE_PID, ns);
1625}
1626
1627static inline pid_t task_pid_vnr(struct task_struct *tsk)
1628{
1629        return __task_pid_nr_ns(tsk, PIDTYPE_PID, NULL);
1630}
1631
1632
1633static inline pid_t task_tgid_nr(struct task_struct *tsk)
1634{
1635        return tsk->tgid;
1636}
1637
1638pid_t task_tgid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);
1639
1640static inline pid_t task_tgid_vnr(struct task_struct *tsk)
1641{
1642        return pid_vnr(task_tgid(tsk));
1643}
1644
1645
1646static inline pid_t task_pgrp_nr_ns(struct task_struct *tsk,
1647                                        struct pid_namespace *ns)
1648{
1649        return __task_pid_nr_ns(tsk, PIDTYPE_PGID, ns);
1650}
1651
1652static inline pid_t task_pgrp_vnr(struct task_struct *tsk)
1653{
1654        return __task_pid_nr_ns(tsk, PIDTYPE_PGID, NULL);
1655}
1656
1657
1658static inline pid_t task_session_nr_ns(struct task_struct *tsk,
1659                                        struct pid_namespace *ns)
1660{
1661        return __task_pid_nr_ns(tsk, PIDTYPE_SID, ns);
1662}
1663
1664static inline pid_t task_session_vnr(struct task_struct *tsk)
1665{
1666        return __task_pid_nr_ns(tsk, PIDTYPE_SID, NULL);
1667}
1668
1669/* obsolete, do not use */
1670static inline pid_t task_pgrp_nr(struct task_struct *tsk)
1671{
1672        return task_pgrp_nr_ns(tsk, &init_pid_ns);
1673}
1674
1675/**
1676 * pid_alive - check that a task structure is not stale
1677 * @p: Task structure to be checked.
1678 *
1679 * Test if a process is not yet dead (at most zombie state)
1680 * If pid_alive fails, then pointers within the task structure
1681 * can be stale and must not be dereferenced.
1682 */
1683static inline int pid_alive(struct task_struct *p)
1684{
1685        return p->pids[PIDTYPE_PID].pid != NULL;
1686}
1687
1688/**
1689 * is_global_init - check if a task structure is init
1690 * @tsk: Task structure to be checked.
1691 *
1692 * Check if a task structure is the first user space task the kernel created.
1693 */
1694static inline int is_global_init(struct task_struct *tsk)
1695{
1696        return tsk->pid == 1;
1697}
1698
1699/*
1700 * is_container_init:
1701 * check whether in the task is init in its own pid namespace.
1702 */
1703extern int is_container_init(struct task_struct *tsk);
1704
1705extern struct pid *cad_pid;
1706
1707extern void free_task(struct task_struct *tsk);
1708#define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0)
1709
1710extern void __put_task_struct(struct task_struct *t);
1711
1712static inline void put_task_struct(struct task_struct *t)
1713{
1714        if (atomic_dec_and_test(&t->usage))
1715                __put_task_struct(t);
1716}
1717
1718extern void task_times(struct task_struct *p, cputime_t *ut, cputime_t *st);
1719extern void thread_group_times(struct task_struct *p, cputime_t *ut, cputime_t *st);
1720
1721/*
1722 * Per process flags
1723 */
1724#define PF_KSOFTIRQD    0x00000001      /* I am ksoftirqd */
1725#define PF_STARTING     0x00000002      /* being created */
1726#define PF_EXITING      0x00000004      /* getting shut down */
1727#define PF_EXITPIDONE   0x00000008      /* pi exit done on shut down */
1728#define PF_VCPU         0x00000010      /* I'm a virtual CPU */
1729#define PF_WQ_WORKER    0x00000020      /* I'm a workqueue worker */
1730#define PF_FORKNOEXEC   0x00000040      /* forked but didn't exec */
1731#define PF_MCE_PROCESS  0x00000080      /* process policy on mce errors */
1732#define PF_SUPERPRIV    0x00000100      /* used super-user privileges */
1733#define PF_DUMPCORE     0x00000200      /* dumped core */
1734#define PF_SIGNALED     0x00000400      /* killed by a signal */
1735#define PF_MEMALLOC     0x00000800      /* Allocating memory */
1736#define PF_USED_MATH    0x00002000      /* if unset the fpu must be initialized before use */
1737#define PF_FREEZING     0x00004000      /* freeze in progress. do not account to load */
1738#define PF_NOFREEZE     0x00008000      /* this thread should not be frozen */
1739#define PF_FROZEN       0x00010000      /* frozen for system suspend */
1740#define PF_FSTRANS      0x00020000      /* inside a filesystem transaction */
1741#define PF_KSWAPD       0x00040000      /* I am kswapd */
1742#define PF_OOM_ORIGIN   0x00080000      /* Allocating much memory to others */
1743#define PF_LESS_THROTTLE 0x00100000     /* Throttle me less: I clean memory */
1744#define PF_KTHREAD      0x00200000      /* I am a kernel thread */
1745#define PF_RANDOMIZE    0x00400000      /* randomize virtual address space */
1746#define PF_SWAPWRITE    0x00800000      /* Allowed to write to swap */
1747#define PF_SPREAD_PAGE  0x01000000      /* Spread page cache over cpuset */
1748#define PF_SPREAD_SLAB  0x02000000      /* Spread some slab caches over cpuset */
1749#define PF_THREAD_BOUND 0x04000000      /* Thread bound to specific cpu */
1750#define PF_MCE_EARLY    0x08000000      /* Early kill for mce process policy */
1751#define PF_MEMPOLICY    0x10000000      /* Non-default NUMA mempolicy */
1752#define PF_MUTEX_TESTER 0x20000000      /* Thread belongs to the rt mutex tester */
1753#define PF_FREEZER_SKIP 0x40000000      /* Freezer should not count it as freezable */
1754#define PF_FREEZER_NOSIG 0x80000000     /* Freezer won't send signals to it */
1755
1756/*
1757 * Only the _current_ task can read/write to tsk->flags, but other
1758 * tasks can access tsk->flags in readonly mode for example
1759 * with tsk_used_math (like during threaded core dumping).
1760 * There is however an exception to this rule during ptrace
1761 * or during fork: the ptracer task is allowed to write to the
1762 * child->flags of its traced child (same goes for fork, the parent
1763 * can write to the child->flags), because we're guaranteed the
1764 * child is not running and in turn not changing child->flags
1765 * at the same time the parent does it.
1766 */
1767#define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0)
1768#define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0)
1769#define clear_used_math() clear_stopped_child_used_math(current)
1770#define set_used_math() set_stopped_child_used_math(current)
1771#define conditional_stopped_child_used_math(condition, child) \
1772        do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0)
1773#define conditional_used_math(condition) \
1774        conditional_stopped_child_used_math(condition, current)
1775#define copy_to_stopped_child_used_math(child) \
1776        do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0)
1777/* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */
1778#define tsk_used_math(p) ((p)->flags & PF_USED_MATH)
1779#define used_math() tsk_used_math(current)
1780
1781#ifdef CONFIG_PREEMPT_RCU
1782
1783#define RCU_READ_UNLOCK_BLOCKED (1 << 0) /* blocked while in RCU read-side. */
1784#define RCU_READ_UNLOCK_BOOSTED (1 << 1) /* boosted while in RCU read-side. */
1785#define RCU_READ_UNLOCK_NEED_QS (1 << 2) /* RCU core needs CPU response. */
1786
1787static inline void rcu_copy_process(struct task_struct *p)
1788{
1789        p->rcu_read_lock_nesting = 0;
1790        p->rcu_read_unlock_special = 0;
1791#ifdef CONFIG_TREE_PREEMPT_RCU
1792        p->rcu_blocked_node = NULL;
1793#endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */
1794#ifdef CONFIG_RCU_BOOST
1795        p->rcu_boost_mutex = NULL;
1796#endif /* #ifdef CONFIG_RCU_BOOST */
1797        INIT_LIST_HEAD(&p->rcu_node_entry);
1798}
1799
1800#else
1801
1802static inline void rcu_copy_process(struct task_struct *p)
1803{
1804}
1805
1806#endif
1807
1808#ifdef CONFIG_SMP
1809extern int set_cpus_allowed_ptr(struct task_struct *p,
1810                                const struct cpumask *new_mask);
1811#else
1812static inline int set_cpus_allowed_ptr(struct task_struct *p,
1813                                       const struct cpumask *new_mask)
1814{
1815        if (!cpumask_test_cpu(0, new_mask))
1816                return -EINVAL;
1817        return 0;
1818}
1819#endif
1820
1821#ifndef CONFIG_CPUMASK_OFFSTACK
1822static inline int set_cpus_allowed(struct task_struct *p, cpumask_t new_mask)
1823{
1824        return set_cpus_allowed_ptr(p, &new_mask);
1825}
1826#endif
1827
1828/*
1829 * Do not use outside of architecture code which knows its limitations.
1830 *
1831 * sched_clock() has no promise of monotonicity or bounded drift between
1832 * CPUs, use (which you should not) requires disabling IRQs.
1833 *
1834 * Please use one of the three interfaces below.
1835 */
1836extern unsigned long long notrace sched_clock(void);
1837/*
1838 * See the comment in kernel/sched_clock.c
1839 */
1840extern u64 cpu_clock(int cpu);
1841extern u64 local_clock(void);
1842extern u64 sched_clock_cpu(int cpu);
1843
1844
1845extern void sched_clock_init(void);
1846
1847#ifndef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK
1848static inline void sched_clock_tick(void)
1849{
1850}
1851
1852static inline void sched_clock_idle_sleep_event(void)
1853{
1854}
1855
1856static inline void sched_clock_idle_wakeup_event(u64 delta_ns)
1857{
1858}
1859#else
1860/*
1861 * Architectures can set this to 1 if they have specified
1862 * CONFIG_HAVE_UNSTABLE_SCHED_CLOCK in their arch Kconfig,
1863 * but then during bootup it turns out that sched_clock()
1864 * is reliable after all:
1865 */
1866extern int sched_clock_stable;
1867
1868extern void sched_clock_tick(void);
1869extern void sched_clock_idle_sleep_event(void);
1870extern void sched_clock_idle_wakeup_event(u64 delta_ns);
1871#endif
1872
1873#ifdef CONFIG_IRQ_TIME_ACCOUNTING
1874/*
1875 * An i/f to runtime opt-in for irq time accounting based off of sched_clock.
1876 * The reason for this explicit opt-in is not to have perf penalty with
1877 * slow sched_clocks.
1878 */
1879extern void enable_sched_clock_irqtime(void);
1880extern void disable_sched_clock_irqtime(void);
1881#else
1882static inline void enable_sched_clock_irqtime(void) {}
1883static inline void disable_sched_clock_irqtime(void) {}
1884#endif
1885
1886extern unsigned long long
1887task_sched_runtime(struct task_struct *task);
1888extern unsigned long long thread_group_sched_runtime(struct task_struct *task);
1889
1890/* sched_exec is called by processes performing an exec */
1891#ifdef CONFIG_SMP
1892extern void sched_exec(void);
1893#else
1894#define sched_exec()   {}
1895#endif
1896
1897extern void sched_clock_idle_sleep_event(void);
1898extern void sched_clock_idle_wakeup_event(u64 delta_ns);
1899
1900#ifdef CONFIG_HOTPLUG_CPU
1901extern void idle_task_exit(void);
1902#else
1903static inline void idle_task_exit(void) {}
1904#endif
1905
1906#if defined(CONFIG_NO_HZ) && defined(CONFIG_SMP)
1907extern void wake_up_idle_cpu(int cpu);
1908#else
1909static inline void wake_up_idle_cpu(int cpu) { }
1910#endif
1911
1912extern unsigned int sysctl_sched_latency;
1913extern unsigned int sysctl_sched_min_granularity;
1914extern unsigned int sysctl_sched_wakeup_granularity;
1915extern unsigned int sysctl_sched_child_runs_first;
1916
1917enum sched_tunable_scaling {
1918        SCHED_TUNABLESCALING_NONE,
1919        SCHED_TUNABLESCALING_LOG,
1920        SCHED_TUNABLESCALING_LINEAR,
1921        SCHED_TUNABLESCALING_END,
1922};
1923extern enum sched_tunable_scaling sysctl_sched_tunable_scaling;
1924
1925#ifdef CONFIG_SCHED_DEBUG
1926extern unsigned int sysctl_sched_migration_cost;
1927extern unsigned int sysctl_sched_nr_migrate;
1928extern unsigned int sysctl_sched_time_avg;
1929extern unsigned int sysctl_timer_migration;
1930extern unsigned int sysctl_sched_shares_window;
1931
1932int sched_proc_update_handler(struct ctl_table *table, int write,
1933                void __user *buffer, size_t *length,
1934                loff_t *ppos);
1935#endif
1936#ifdef CONFIG_SCHED_DEBUG
1937static inline unsigned int get_sysctl_timer_migration(void)
1938{
1939        return sysctl_timer_migration;
1940}
1941#else
1942static inline unsigned int get_sysctl_timer_migration(void)
1943{
1944        return 1;
1945}
1946#endif
1947extern unsigned int sysctl_sched_rt_period;
1948extern int sysctl_sched_rt_runtime;
1949
1950int sched_rt_handler(struct ctl_table *table, int write,
1951                void __user *buffer, size_t *lenp,
1952                loff_t *ppos);
1953
1954extern unsigned int sysctl_sched_compat_yield;
1955
1956#ifdef CONFIG_SCHED_AUTOGROUP
1957extern unsigned int sysctl_sched_autogroup_enabled;
1958
1959extern void sched_autogroup_create_attach(struct task_struct *p);
1960extern void sched_autogroup_detach(struct task_struct *p);
1961extern void sched_autogroup_fork(struct signal_struct *sig);
1962extern void sched_autogroup_exit(struct signal_struct *sig);
1963#ifdef CONFIG_PROC_FS
1964extern void proc_sched_autogroup_show_task(struct task_struct *p, struct seq_file *m);
1965extern int proc_sched_autogroup_set_nice(struct task_struct *p, int *nice);
1966#endif
1967#else
1968static inline void sched_autogroup_create_attach(struct task_struct *p) { }
1969static inline void sched_autogroup_detach(struct task_struct *p) { }
1970static inline void sched_autogroup_fork(struct signal_struct *sig) { }
1971static inline void sched_autogroup_exit(struct signal_struct *sig) { }
1972#endif
1973
1974#ifdef CONFIG_RT_MUTEXES
1975extern int rt_mutex_getprio(struct task_struct *p);
1976extern void rt_mutex_setprio(struct task_struct *p, int prio);
1977extern void rt_mutex_adjust_pi(struct task_struct *p);
1978#else
1979static inline int rt_mutex_getprio(struct task_struct *p)
1980{
1981        return p->normal_prio;
1982}
1983# define rt_mutex_adjust_pi(p)          do { } while (0)
1984#endif
1985
1986extern void set_user_nice(struct task_struct *p, long nice);
1987extern int task_prio(const struct task_struct *p);
1988extern int task_nice(const struct task_struct *p);
1989extern int can_nice(const struct task_struct *p, const int nice);
1990extern int task_curr(const struct task_struct *p);
1991extern int idle_cpu(int cpu);
1992extern int sched_setscheduler(struct task_struct *, int,
1993                              const struct sched_param *);
1994extern int sched_setscheduler_nocheck(struct task_struct *, int,
1995                                      const struct sched_param *);
1996extern struct task_struct *idle_task(int cpu);
1997extern struct task_struct *curr_task(int cpu);
1998extern void set_curr_task(int cpu, struct task_struct *p);
1999
2000void yield(void);
2001
2002/*
2003 * The default (Linux) execution domain.
2004 */
2005extern struct exec_domain       default_exec_domain;
2006
2007union thread_union {
2008        struct thread_info thread_info;
2009        unsigned long stack[THREAD_SIZE/sizeof(long)];
2010};
2011
2012#ifndef __HAVE_ARCH_KSTACK_END
2013static inline int kstack_end(void *addr)
2014{
2015        /* Reliable end of stack detection:
2016         * Some APM bios versions misalign the stack
2017         */
2018        return !(((unsigned long)addr+sizeof(void*)-1) & (THREAD_SIZE-sizeof(void*)));
2019}
2020#endif
2021
2022extern union thread_union init_thread_union;
2023extern struct task_struct init_task;
2024
2025extern struct   mm_struct init_mm;
2026
2027extern struct pid_namespace init_pid_ns;
2028
2029/*
2030 * find a task by one of its numerical ids
2031 *
2032 * find_task_by_pid_ns():
2033 *      finds a task by its pid in the specified namespace
2034 * find_task_by_vpid():
2035 *      finds a task by its virtual pid
2036 *
2037 * see also find_vpid() etc in include/linux/pid.h
2038 */
2039
2040extern struct task_struct *find_task_by_vpid(pid_t nr);
2041extern struct task_struct *find_task_by_pid_ns(pid_t nr,
2042                struct pid_namespace *ns);
2043
2044extern void __set_special_pids(struct pid *pid);
2045
2046/* per-UID process charging. */
2047extern struct user_struct * alloc_uid(struct user_namespace *, uid_t);
2048static inline struct user_struct *get_uid(struct user_struct *u)
2049{
2050        atomic_inc(&u->__count);
2051        return u;
2052}
2053extern void free_uid(struct user_struct *);
2054extern void release_uids(struct user_namespace *ns);
2055
2056#include <asm/current.h>
2057
2058extern void do_timer(unsigned long ticks);
2059
2060extern int wake_up_state(struct task_struct *tsk, unsigned int state);
2061extern int wake_up_process(struct task_struct *tsk);
2062extern void wake_up_new_task(struct task_struct *tsk,
2063                                unsigned long clone_flags);
2064#ifdef CONFIG_SMP
2065 extern void kick_process(struct task_struct *tsk);
2066#else
2067 static inline void kick_process(struct task_struct *tsk) { }
2068#endif
2069extern void sched_fork(struct task_struct *p, int clone_flags);
2070extern void sched_dead(struct task_struct *p);
2071
2072extern void proc_caches_init(void);
2073extern void flush_signals(struct task_struct *);
2074extern void __flush_signals(struct task_struct *);
2075extern void ignore_signals(struct task_struct *);
2076extern void flush_signal_handlers(struct task_struct *, int force_default);
2077extern int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info);
2078
2079static inline int dequeue_signal_lock(struct task_struct *tsk, sigset_t *mask, siginfo_t *info)
2080{
2081        unsigned long flags;
2082        int ret;
2083
2084        spin_lock_irqsave(&tsk->sighand->siglock, flags);
2085        ret = dequeue_signal(tsk, mask, info);
2086        spin_unlock_irqrestore(&tsk->sighand->siglock, flags);
2087
2088        return ret;
2089}       
2090
2091extern void block_all_signals(int (*notifier)(void *priv), void *priv,
2092                              sigset_t *mask);
2093extern void unblock_all_signals(void);
2094extern void release_task(struct task_struct * p);
2095extern int send_sig_info(int, struct siginfo *, struct task_struct *);
2096extern int force_sigsegv(int, struct task_struct *);
2097extern int force_sig_info(int, struct siginfo *, struct task_struct *);
2098extern int __kill_pgrp_info(int sig, struct siginfo *info, struct pid *pgrp);
2099extern int kill_pid_info(int sig, struct siginfo *info, struct pid *pid);
2100extern int kill_pid_info_as_uid(int, struct siginfo *, struct pid *, uid_t, uid_t, u32);
2101extern int kill_pgrp(struct pid *pid, int sig, int priv);
2102extern int kill_pid(struct pid *pid, int sig, int priv);
2103extern int kill_proc_info(int, struct siginfo *, pid_t);
2104extern int do_notify_parent(struct task_struct *, int);
2105extern void __wake_up_parent(struct task_struct *p, struct task_struct *parent);
2106extern void force_sig(int, struct task_struct *);
2107extern int send_sig(int, struct task_struct *, int);
2108extern int zap_other_threads(struct task_struct *p);
2109extern struct sigqueue *sigqueue_alloc(void);
2110extern void sigqueue_free(struct sigqueue *);
2111extern int send_sigqueue(struct sigqueue *,  struct task_struct *, int group);
2112extern int do_sigaction(int, struct k_sigaction *, struct k_sigaction *);
2113extern int do_sigaltstack(const stack_t __user *, stack_t __user *, unsigned long);
2114
2115static inline int kill_cad_pid(int sig, int priv)
2116{
2117        return kill_pid(cad_pid, sig, priv);
2118}
2119
2120/* These can be the second arg to send_sig_info/send_group_sig_info.  */
2121#define SEND_SIG_NOINFO ((struct siginfo *) 0)
2122#define SEND_SIG_PRIV   ((struct siginfo *) 1)
2123#define SEND_SIG_FORCED ((struct siginfo *) 2)
2124
2125/*
2126 * True if we are on the alternate signal stack.
2127 */
2128static inline int on_sig_stack(unsigned long sp)
2129{
2130#ifdef CONFIG_STACK_GROWSUP
2131        return sp >= current->sas_ss_sp &&
2132                sp - current->sas_ss_sp < current->sas_ss_size;
2133#else
2134        return sp > current->sas_ss_sp &&
2135                sp - current->sas_ss_sp <= current->sas_ss_size;
2136#endif
2137}
2138
2139static inline int sas_ss_flags(unsigned long sp)
2140{
2141        return (current->sas_ss_size == 0 ? SS_DISABLE
2142                : on_sig_stack(sp) ? SS_ONSTACK : 0);
2143}
2144
2145/*
2146 * Routines for handling mm_structs
2147 */
2148extern struct mm_struct * mm_alloc(void);
2149
2150/* mmdrop drops the mm and the page tables */
2151extern void __mmdrop(struct mm_struct *);
2152static inline void mmdrop(struct mm_struct * mm)
2153{
2154        if (unlikely(atomic_dec_and_test(&mm->mm_count)))
2155                __mmdrop(mm);
2156}
2157
2158/* mmput gets rid of the mappings and all user-space */
2159extern void mmput(struct mm_struct *);
2160/* Grab a reference to a task's mm, if it is not already going away */
2161extern struct mm_struct *get_task_mm(struct task_struct *task);
2162/* Remove the current tasks stale references to the old mm_struct */
2163extern void mm_release(struct task_struct *, struct mm_struct *);
2164/* Allocate a new mm structure and copy contents from tsk->mm */
2165extern struct mm_struct *dup_mm(struct task_struct *tsk);
2166
2167extern int copy_thread(unsigned long, unsigned long, unsigned long,
2168                        struct task_struct *, struct pt_regs *);
2169extern void flush_thread(void);
2170extern void exit_thread(void);
2171
2172extern void exit_files(struct task_struct *);
2173extern void __cleanup_sighand(struct sighand_struct *);
2174
2175extern void exit_itimers(struct signal_struct *);
2176extern void flush_itimer_signals(void);
2177
2178extern NORET_TYPE void do_group_exit(int);
2179
2180extern void daemonize(const char *, ...);
2181extern int allow_signal(int);
2182extern int disallow_signal(int);
2183
2184extern int do_execve(const char *,
2185                     const char __user * const __user *,
2186                     const char __user * const __user *, struct pt_regs *);
2187extern long do_fork(unsigned long, unsigned long, struct pt_regs *, unsigned long, int __user *, int __user *);
2188struct task_struct *fork_idle(int);
2189
2190extern void set_task_comm(struct task_struct *tsk, char *from);
2191extern char *get_task_comm(char *to, struct task_struct *tsk);
2192
2193#ifdef CONFIG_SMP
2194extern unsigned long wait_task_inactive(struct task_struct *, long match_state);
2195#else
2196static inline unsigned long wait_task_inactive(struct task_struct *p,
2197                                               long match_state)
2198{
2199        return 1;
2200}
2201#endif
2202
2203#define next_task(p) \
2204        list_entry_rcu((p)->tasks.next, struct task_struct, tasks)
2205
2206#define for_each_process(p) \
2207        for (p = &init_task ; (p = next_task(p)) != &init_task ; )
2208
2209extern bool current_is_single_threaded(void);
2210
2211/*
2212 * Careful: do_each_thread/while_each_thread is a double loop so
2213 *          'break' will not work as expected - use goto instead.
2214 */
2215#define do_each_thread(g, t) \
2216        for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do
2217
2218#define while_each_thread(g, t) \
2219        while ((t = next_thread(t)) != g)
2220
2221static inline int get_nr_threads(struct task_struct *tsk)
2222{
2223        return tsk->signal->nr_threads;
2224}
2225
2226/* de_thread depends on thread_group_leader not being a pid based check */
2227#define thread_group_leader(p)  (p == p->group_leader)
2228
2229/* Do to the insanities of de_thread it is possible for a process
2230 * to have the pid of the thread group leader without actually being
2231 * the thread group leader.  For iteration through the pids in proc
2232 * all we care about is that we have a task with the appropriate
2233 * pid, we don't actually care if we have the right task.
2234 */
2235static inline int has_group_leader_pid(struct task_struct *p)
2236{
2237        return p->pid == p->tgid;
2238}
2239
2240static inline
2241int same_thread_group(struct task_struct *p1, struct task_struct *p2)
2242{
2243        return p1->tgid == p2->tgid;
2244}
2245
2246static inline struct task_struct *next_thread(const struct task_struct *p)
2247{
2248        return list_entry_rcu(p->thread_group.next,
2249                              struct task_struct, thread_group);
2250}
2251
2252static inline int thread_group_empty(struct task_struct *p)
2253{
2254        return list_empty(&p->thread_group);
2255}
2256
2257#define delay_group_leader(p) \
2258                (thread_group_leader(p) && !thread_group_empty(p))
2259
2260static inline int task_detached(struct task_struct *p)
2261{
2262        return p->exit_signal == -1;
2263}
2264
2265/*
2266 * Protects ->fs, ->files, ->mm, ->group_info, ->comm, keyring
2267 * subscriptions and synchronises with wait4().  Also used in procfs.  Also
2268 * pins the final release of task.io_context.  Also protects ->cpuset and
2269 * ->cgroup.subsys[].
2270 *
2271 * Nests both inside and outside of read_lock(&tasklist_lock).
2272 * It must not be nested with write_lock_irq(&tasklist_lock),
2273 * neither inside nor outside.
2274 */
2275static inline void task_lock(struct task_struct *p)
2276{
2277        spin_lock(&p->alloc_lock);
2278}
2279
2280static inline void task_unlock(struct task_struct *p)
2281{
2282        spin_unlock(&p->alloc_lock);
2283}
2284
2285extern struct sighand_struct *__lock_task_sighand(struct task_struct *tsk,
2286                                                        unsigned long *flags);
2287
2288#define lock_task_sighand(tsk, flags)                                   \
2289({      struct sighand_struct *__ss;                                    \
2290        __cond_lock(&(tsk)->sighand->siglock,                           \
2291                    (__ss = __lock_task_sighand(tsk, flags)));          \
2292        __ss;                                                           \
2293})                                                                      \
2294
2295static inline void unlock_task_sighand(struct task_struct *tsk,
2296                                                unsigned long *flags)
2297{
2298        spin_unlock_irqrestore(&tsk->sighand->siglock, *flags);
2299}
2300
2301#ifndef __HAVE_THREAD_FUNCTIONS
2302
2303#define task_thread_info(task)  ((struct thread_info *)(task)->stack)
2304#define task_stack_page(task)   ((task)->stack)
2305
2306static inline void setup_thread_stack(struct task_struct *p, struct task_struct *org)
2307{
2308        *task_thread_info(p) = *task_thread_info(org);
2309        task_thread_info(p)->task = p;
2310}
2311
2312static inline unsigned long *end_of_stack(struct task_struct *p)
2313{
2314        return (unsigned long *)(task_thread_info(p) + 1);
2315}
2316
2317#endif
2318
2319static inline int object_is_on_stack(void *obj)
2320{
2321        void *stack = task_stack_page(current);
2322
2323        return (obj >= stack) && (obj < (stack + THREAD_SIZE));
2324}
2325
2326extern void thread_info_cache_init(void);
2327
2328#ifdef CONFIG_DEBUG_STACK_USAGE
2329static inline unsigned long stack_not_used(struct task_struct *p)
2330{
2331        unsigned long *n = end_of_stack(p);
2332
2333        do {    /* Skip over canary */
2334                n++;
2335        } while (!*n);
2336
2337        return (unsigned long)n - (unsigned long)end_of_stack(p);
2338}
2339#endif
2340
2341/* set thread flags in other task's structures
2342 * - see asm/thread_info.h for TIF_xxxx flags available
2343 */
2344static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag)
2345{
2346        set_ti_thread_flag(task_thread_info(tsk), flag);
2347}
2348
2349static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag)
2350{
2351        clear_ti_thread_flag(task_thread_info(tsk), flag);
2352}
2353
2354static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag)
2355{
2356        return test_and_set_ti_thread_flag(task_thread_info(tsk), flag);
2357}
2358
2359static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag)
2360{
2361        return test_and_clear_ti_thread_flag(task_thread_info(tsk), flag);
2362}
2363
2364static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag)
2365{
2366        return test_ti_thread_flag(task_thread_info(tsk), flag);
2367}
2368
2369static inline void set_tsk_need_resched(struct task_struct *tsk)
2370{
2371        set_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
2372}
2373
2374static inline void clear_tsk_need_resched(struct task_struct *tsk)
2375{
2376        clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
2377}
2378
2379static inline int test_tsk_need_resched(struct task_struct *tsk)
2380{
2381        return unlikely(test_tsk_thread_flag(tsk,TIF_NEED_RESCHED));
2382}
2383
2384static inline int restart_syscall(void)
2385{
2386        set_tsk_thread_flag(current, TIF_SIGPENDING);
2387        return -ERESTARTNOINTR;
2388}
2389
2390static inline int signal_pending(struct task_struct *p)
2391{
2392        return unlikely(test_tsk_thread_flag(p,TIF_SIGPENDING));
2393}
2394
2395static inline int __fatal_signal_pending(struct task_struct *p)
2396{
2397        return unlikely(sigismember(&p->pending.signal, SIGKILL));
2398}
2399
2400static inline int fatal_signal_pending(struct task_struct *p)
2401{
2402        return signal_pending(p) && __fatal_signal_pending(p);
2403}
2404
2405static inline int signal_pending_state(long state, struct task_struct *p)
2406{
2407        if (!(state & (TASK_INTERRUPTIBLE | TASK_WAKEKILL)))
2408                return 0;
2409        if (!signal_pending(p))
2410                return 0;
2411
2412        return (state & TASK_INTERRUPTIBLE) || __fatal_signal_pending(p);
2413}
2414
2415static inline int need_resched(void)
2416{
2417        return unlikely(test_thread_flag(TIF_NEED_RESCHED));
2418}
2419
2420/*
2421 * cond_resched() and cond_resched_lock(): latency reduction via
2422 * explicit rescheduling in places that are safe. The return
2423 * value indicates whether a reschedule was done in fact.
2424 * cond_resched_lock() will drop the spinlock before scheduling,
2425 * cond_resched_softirq() will enable bhs before scheduling.
2426 */
2427extern int _cond_resched(void);
2428
2429#define cond_resched() ({                       \
2430        __might_sleep(__FILE__, __LINE__, 0);   \
2431        _cond_resched();                        \
2432})
2433
2434extern int __cond_resched_lock(spinlock_t *lock);
2435
2436#ifdef CONFIG_PREEMPT
2437#define PREEMPT_LOCK_OFFSET     PREEMPT_OFFSET
2438#else
2439#define PREEMPT_LOCK_OFFSET     0
2440#endif
2441
2442#define cond_resched_lock(lock) ({                              \
2443        __might_sleep(__FILE__, __LINE__, PREEMPT_LOCK_OFFSET); \
2444        __cond_resched_lock(lock);                              \
2445})
2446
2447extern int __cond_resched_softirq(void);
2448
2449#define cond_resched_softirq() ({                                       \
2450        __might_sleep(__FILE__, __LINE__, SOFTIRQ_DISABLE_OFFSET);      \
2451        __cond_resched_softirq();                                       \
2452})
2453
2454/*
2455 * Does a critical section need to be broken due to another
2456 * task waiting?: (technically does not depend on CONFIG_PREEMPT,
2457 * but a general need for low latency)
2458 */
2459static inline int spin_needbreak(spinlock_t *lock)
2460{
2461#ifdef CONFIG_PREEMPT
2462        return spin_is_contended(lock);
2463#else
2464        return 0;
2465#endif
2466}
2467
2468/*
2469 * Thread group CPU time accounting.
2470 */
2471void thread_group_cputime(struct task_struct *tsk, struct task_cputime *times);
2472void thread_group_cputimer(struct task_struct *tsk, struct task_cputime *times);
2473
2474static inline void thread_group_cputime_init(struct signal_struct *sig)
2475{
2476        spin_lock_init(&sig->cputimer.lock);
2477}
2478
2479/*
2480 * Reevaluate whether the task has signals pending delivery.
2481 * Wake the task if so.
2482 * This is required every time the blocked sigset_t changes.
2483 * callers must hold sighand->siglock.
2484 */
2485extern void recalc_sigpending_and_wake(struct task_struct *t);
2486extern void recalc_sigpending(void);
2487
2488extern void signal_wake_up(struct task_struct *t, int resume_stopped);
2489
2490/*
2491 * Wrappers for p->thread_info->cpu access. No-op on UP.
2492 */
2493#ifdef CONFIG_SMP
2494
2495static inline unsigned int task_cpu(const struct task_struct *p)
2496{
2497        return task_thread_info(p)->cpu;
2498}
2499
2500extern void set_task_cpu(struct task_struct *p, unsigned int cpu);
2501
2502#else
2503
2504static inline unsigned int task_cpu(const struct task_struct *p)
2505{
2506        return 0;
2507}
2508
2509static inline void set_task_cpu(struct task_struct *p, unsigned int cpu)
2510{
2511}
2512
2513#endif /* CONFIG_SMP */
2514
2515extern long sched_setaffinity(pid_t pid, const struct cpumask *new_mask);
2516extern long sched_getaffinity(pid_t pid, struct cpumask *mask);
2517
2518extern void normalize_rt_tasks(void);
2519
2520#ifdef CONFIG_CGROUP_SCHED
2521
2522extern struct task_group root_task_group;
2523
2524extern struct task_group *sched_create_group(struct task_group *parent);
2525extern void sched_destroy_group(struct task_group *tg);
2526extern void sched_move_task(struct task_struct *tsk);
2527#ifdef CONFIG_FAIR_GROUP_SCHED
2528extern int sched_group_set_shares(struct task_group *tg, unsigned long shares);
2529extern unsigned long sched_group_shares(struct task_group *tg);
2530#endif
2531#ifdef CONFIG_RT_GROUP_SCHED
2532extern int sched_group_set_rt_runtime(struct task_group *tg,
2533                                      long rt_runtime_us);
2534extern long sched_group_rt_runtime(struct task_group *tg);
2535extern int sched_group_set_rt_period(struct task_group *tg,
2536                                      long rt_period_us);
2537extern long sched_group_rt_period(struct task_group *tg);
2538extern int sched_rt_can_attach(struct task_group *tg, struct task_struct *tsk);
2539#endif
2540#endif
2541
2542extern int task_can_switch_user(struct user_struct *up,
2543                                        struct task_struct *tsk);
2544
2545#ifdef CONFIG_TASK_XACCT
2546static inline void add_rchar(struct task_struct *tsk, ssize_t amt)
2547{
2548        tsk->ioac.rchar += amt;
2549}
2550
2551static inline void add_wchar(struct task_struct *tsk, ssize_t amt)
2552{
2553        tsk->ioac.wchar += amt;
2554}
2555
2556static inline void inc_syscr(struct task_struct *tsk)
2557{
2558        tsk->ioac.syscr++;
2559}
2560
2561static inline void inc_syscw(struct task_struct *tsk)
2562{
2563        tsk->ioac.syscw++;
2564}
2565#else
2566static inline void add_rchar(struct task_struct *tsk, ssize_t amt)
2567{
2568}
2569
2570static inline void add_wchar(struct task_struct *tsk, ssize_t amt)
2571{
2572}
2573
2574static inline void inc_syscr(struct task_struct *tsk)
2575{
2576}
2577
2578static inline void inc_syscw(struct task_struct *tsk)
2579{
2580}
2581#endif
2582
2583#ifndef TASK_SIZE_OF
2584#define TASK_SIZE_OF(tsk)       TASK_SIZE
2585#endif
2586
2587/*
2588 * Call the function if the target task is executing on a CPU right now:
2589 */
2590extern void task_oncpu_function_call(struct task_struct *p,
2591                                     void (*func) (void *info), void *info);
2592
2593
2594#ifdef CONFIG_MM_OWNER
2595extern void mm_update_next_owner(struct mm_struct *mm);
2596extern void mm_init_owner(struct mm_struct *mm, struct task_struct *p);
2597#else
2598static inline void mm_update_next_owner(struct mm_struct *mm)
2599{
2600}
2601
2602static inline void mm_init_owner(struct mm_struct *mm, struct task_struct *p)
2603{
2604}
2605#endif /* CONFIG_MM_OWNER */
2606
2607static inline unsigned long task_rlimit(const struct task_struct *tsk,
2608                unsigned int limit)
2609{
2610        return ACCESS_ONCE(tsk->signal->rlim[limit].rlim_cur);
2611}
2612
2613static inline unsigned long task_rlimit_max(const struct task_struct *tsk,
2614                unsigned int limit)
2615{
2616        return ACCESS_ONCE(tsk->signal->rlim[limit].rlim_max);
2617}
2618
2619static inline unsigned long rlimit(unsigned int limit)
2620{
2621        return task_rlimit(current, limit);
2622}
2623
2624static inline unsigned long rlimit_max(unsigned int limit)
2625{
2626        return task_rlimit_max(current, limit);
2627}
2628
2629#endif /* __KERNEL__ */
2630
2631#endif
2632