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#if defined(SPLIT_RSS_COUNTING)
1258        struct task_rss_stat    rss_stat;
1259#endif
1260/* task state */
1261        int exit_state;
1262        int exit_code, exit_signal;
1263        int pdeath_signal;  /*  The signal sent when the parent dies  */
1264        /* ??? */
1265        unsigned int personality;
1266        unsigned did_exec:1;
1267        unsigned in_execve:1;   /* Tell the LSMs that the process is doing an
1268                                 * execve */
1269        unsigned in_iowait:1;
1270
1271
1272        /* Revert to default priority/policy when forking */
1273        unsigned sched_reset_on_fork:1;
1274
1275        pid_t pid;
1276        pid_t tgid;
1277
1278#ifdef CONFIG_CC_STACKPROTECTOR
1279        /* Canary value for the -fstack-protector gcc feature */
1280        unsigned long stack_canary;
1281#endif
1282
1283        /* 
1284         * pointers to (original) parent process, youngest child, younger sibling,
1285         * older sibling, respectively.  (p->father can be replaced with 
1286         * p->real_parent->pid)
1287         */
1288        struct task_struct *real_parent; /* real parent process */
1289        struct task_struct *parent; /* recipient of SIGCHLD, wait4() reports */
1290        /*
1291         * children/sibling forms the list of my natural children
1292         */
1293        struct list_head children;      /* list of my children */
1294        struct list_head sibling;       /* linkage in my parent's children list */
1295        struct task_struct *group_leader;       /* threadgroup leader */
1296
1297        /*
1298         * ptraced is the list of tasks this task is using ptrace on.
1299         * This includes both natural children and PTRACE_ATTACH targets.
1300         * p->ptrace_entry is p's link on the p->parent->ptraced list.
1301         */
1302        struct list_head ptraced;
1303        struct list_head ptrace_entry;
1304
1305        /* PID/PID hash table linkage. */
1306        struct pid_link pids[PIDTYPE_MAX];
1307        struct list_head thread_group;
1308
1309        struct completion *vfork_done;          /* for vfork() */
1310        int __user *set_child_tid;              /* CLONE_CHILD_SETTID */
1311        int __user *clear_child_tid;            /* CLONE_CHILD_CLEARTID */
1312
1313        cputime_t utime, stime, utimescaled, stimescaled;
1314        cputime_t gtime;
1315#ifndef CONFIG_VIRT_CPU_ACCOUNTING
1316        cputime_t prev_utime, prev_stime;
1317#endif
1318        unsigned long nvcsw, nivcsw; /* context switch counts */
1319        struct timespec start_time;             /* monotonic time */
1320        struct timespec real_start_time;        /* boot based time */
1321/* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */
1322        unsigned long min_flt, maj_flt;
1323
1324        struct task_cputime cputime_expires;
1325        struct list_head cpu_timers[3];
1326
1327/* process credentials */
1328        const struct cred __rcu *real_cred; /* objective and real subjective task
1329                                         * credentials (COW) */
1330        const struct cred __rcu *cred;  /* effective (overridable) subjective task
1331                                         * credentials (COW) */
1332        struct cred *replacement_session_keyring; /* for KEYCTL_SESSION_TO_PARENT */
1333
1334        char comm[TASK_COMM_LEN]; /* executable name excluding path
1335                                     - access with [gs]et_task_comm (which lock
1336                                       it with task_lock())
1337                                     - initialized normally by setup_new_exec */
1338/* file system info */
1339        int link_count, total_link_count;
1340#ifdef CONFIG_SYSVIPC
1341/* ipc stuff */
1342        struct sysv_sem sysvsem;
1343#endif
1344#ifdef CONFIG_DETECT_HUNG_TASK
1345/* hung task detection */
1346        unsigned long last_switch_count;
1347#endif
1348/* CPU-specific state of this task */
1349        struct thread_struct thread;
1350/* filesystem information */
1351        struct fs_struct *fs;
1352/* open file information */
1353        struct files_struct *files;
1354/* namespaces */
1355        struct nsproxy *nsproxy;
1356/* signal handlers */
1357        struct signal_struct *signal;
1358        struct sighand_struct *sighand;
1359
1360        sigset_t blocked, real_blocked;
1361        sigset_t saved_sigmask; /* restored if set_restore_sigmask() was used */
1362        struct sigpending pending;
1363
1364        unsigned long sas_ss_sp;
1365        size_t sas_ss_size;
1366        int (*notifier)(void *priv);
1367        void *notifier_data;
1368        sigset_t *notifier_mask;
1369        struct audit_context *audit_context;
1370#ifdef CONFIG_AUDITSYSCALL
1371        uid_t loginuid;
1372        unsigned int sessionid;
1373#endif
1374        seccomp_t seccomp;
1375
1376/* Thread group tracking */
1377        u32 parent_exec_id;
1378        u32 self_exec_id;
1379/* Protection of (de-)allocation: mm, files, fs, tty, keyrings, mems_allowed,
1380 * mempolicy */
1381        spinlock_t alloc_lock;
1382
1383#ifdef CONFIG_GENERIC_HARDIRQS
1384        /* IRQ handler threads */
1385        struct irqaction *irqaction;
1386#endif
1387
1388        /* Protection of the PI data structures: */
1389        raw_spinlock_t pi_lock;
1390
1391#ifdef CONFIG_RT_MUTEXES
1392        /* PI waiters blocked on a rt_mutex held by this task */
1393        struct plist_head pi_waiters;
1394        /* Deadlock detection and priority inheritance handling */
1395        struct rt_mutex_waiter *pi_blocked_on;
1396#endif
1397
1398#ifdef CONFIG_DEBUG_MUTEXES
1399        /* mutex deadlock detection */
1400        struct mutex_waiter *blocked_on;
1401#endif
1402#ifdef CONFIG_TRACE_IRQFLAGS
1403        unsigned int irq_events;
1404        unsigned long hardirq_enable_ip;
1405        unsigned long hardirq_disable_ip;
1406        unsigned int hardirq_enable_event;
1407        unsigned int hardirq_disable_event;
1408        int hardirqs_enabled;
1409        int hardirq_context;
1410        unsigned long softirq_disable_ip;
1411        unsigned long softirq_enable_ip;
1412        unsigned int softirq_disable_event;
1413        unsigned int softirq_enable_event;
1414        int softirqs_enabled;
1415        int softirq_context;
1416#endif
1417#ifdef CONFIG_LOCKDEP
1418# define MAX_LOCK_DEPTH 48UL
1419        u64 curr_chain_key;
1420        int lockdep_depth;
1421        unsigned int lockdep_recursion;
1422        struct held_lock held_locks[MAX_LOCK_DEPTH];
1423        gfp_t lockdep_reclaim_gfp;
1424#endif
1425
1426/* journalling filesystem info */
1427        void *journal_info;
1428
1429/* stacked block device info */
1430        struct bio_list *bio_list;
1431
1432/* VM state */
1433        struct reclaim_state *reclaim_state;
1434
1435        struct backing_dev_info *backing_dev_info;
1436
1437        struct io_context *io_context;
1438
1439        unsigned long ptrace_message;
1440        siginfo_t *last_siginfo; /* For ptrace use.  */
1441        struct task_io_accounting ioac;
1442#if defined(CONFIG_TASK_XACCT)
1443        u64 acct_rss_mem1;      /* accumulated rss usage */
1444        u64 acct_vm_mem1;       /* accumulated virtual memory usage */
1445        cputime_t acct_timexpd; /* stime + utime since last update */
1446#endif
1447#ifdef CONFIG_CPUSETS
1448        nodemask_t mems_allowed;        /* Protected by alloc_lock */
1449        int mems_allowed_change_disable;
1450        int cpuset_mem_spread_rotor;
1451        int cpuset_slab_spread_rotor;
1452#endif
1453#ifdef CONFIG_CGROUPS
1454        /* Control Group info protected by css_set_lock */
1455        struct css_set __rcu *cgroups;
1456        /* cg_list protected by css_set_lock and tsk->alloc_lock */
1457        struct list_head cg_list;
1458#endif
1459#ifdef CONFIG_FUTEX
1460        struct robust_list_head __user *robust_list;
1461#ifdef CONFIG_COMPAT
1462        struct compat_robust_list_head __user *compat_robust_list;
1463#endif
1464        struct list_head pi_state_list;
1465        struct futex_pi_state *pi_state_cache;
1466#endif
1467#ifdef CONFIG_PERF_EVENTS
1468        struct perf_event_context *perf_event_ctxp[perf_nr_task_contexts];
1469        struct mutex perf_event_mutex;
1470        struct list_head perf_event_list;
1471#endif
1472#ifdef CONFIG_NUMA
1473        struct mempolicy *mempolicy;    /* Protected by alloc_lock */
1474        short il_next;
1475#endif
1476        atomic_t fs_excl;       /* holding fs exclusive resources */
1477        struct rcu_head rcu;
1478
1479        /*
1480         * cache last used pipe for splice
1481         */
1482        struct pipe_inode_info *splice_pipe;
1483#ifdef  CONFIG_TASK_DELAY_ACCT
1484        struct task_delay_info *delays;
1485#endif
1486#ifdef CONFIG_FAULT_INJECTION
1487        int make_it_fail;
1488#endif
1489        struct prop_local_single dirties;
1490#ifdef CONFIG_LATENCYTOP
1491        int latency_record_count;
1492        struct latency_record latency_record[LT_SAVECOUNT];
1493#endif
1494        /*
1495         * time slack values; these are used to round up poll() and
1496         * select() etc timeout values. These are in nanoseconds.
1497         */
1498        unsigned long timer_slack_ns;
1499        unsigned long default_timer_slack_ns;
1500
1501        struct list_head        *scm_work_list;
1502#ifdef CONFIG_FUNCTION_GRAPH_TRACER
1503        /* Index of current stored address in ret_stack */
1504        int curr_ret_stack;
1505        /* Stack of return addresses for return function tracing */
1506        struct ftrace_ret_stack *ret_stack;
1507        /* time stamp for last schedule */
1508        unsigned long long ftrace_timestamp;
1509        /*
1510         * Number of functions that haven't been traced
1511         * because of depth overrun.
1512         */
1513        atomic_t trace_overrun;
1514        /* Pause for the tracing */
1515        atomic_t tracing_graph_pause;
1516#endif
1517#ifdef CONFIG_TRACING
1518        /* state flags for use by tracers */
1519        unsigned long trace;
1520        /* bitmask of trace recursion */
1521        unsigned long trace_recursion;
1522#endif /* CONFIG_TRACING */
1523#ifdef CONFIG_CGROUP_MEM_RES_CTLR /* memcg uses this to do batch job */
1524        struct memcg_batch_info {
1525                int do_batch;   /* incremented when batch uncharge started */
1526                struct mem_cgroup *memcg; /* target memcg of uncharge */
1527                unsigned long bytes;            /* uncharged usage */
1528                unsigned long memsw_bytes; /* uncharged mem+swap usage */
1529        } memcg_batch;
1530#endif
1531};
1532
1533/* Future-safe accessor for struct task_struct's cpus_allowed. */
1534#define tsk_cpus_allowed(tsk) (&(tsk)->cpus_allowed)
1535
1536/*
1537 * Priority of a process goes from 0..MAX_PRIO-1, valid RT
1538 * priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL/SCHED_BATCH
1539 * tasks are in the range MAX_RT_PRIO..MAX_PRIO-1. Priority
1540 * values are inverted: lower p->prio value means higher priority.
1541 *
1542 * The MAX_USER_RT_PRIO value allows the actual maximum
1543 * RT priority to be separate from the value exported to
1544 * user-space.  This allows kernel threads to set their
1545 * priority to a value higher than any user task. Note:
1546 * MAX_RT_PRIO must not be smaller than MAX_USER_RT_PRIO.
1547 */
1548
1549#define MAX_USER_RT_PRIO        100
1550#define MAX_RT_PRIO             MAX_USER_RT_PRIO
1551
1552#define MAX_PRIO                (MAX_RT_PRIO + 40)
1553#define DEFAULT_PRIO            (MAX_RT_PRIO + 20)
1554
1555static inline int rt_prio(int prio)
1556{
1557        if (unlikely(prio < MAX_RT_PRIO))
1558                return 1;
1559        return 0;
1560}
1561
1562static inline int rt_task(struct task_struct *p)
1563{
1564        return rt_prio(p->prio);
1565}
1566
1567static inline struct pid *task_pid(struct task_struct *task)
1568{
1569        return task->pids[PIDTYPE_PID].pid;
1570}
1571
1572static inline struct pid *task_tgid(struct task_struct *task)
1573{
1574        return task->group_leader->pids[PIDTYPE_PID].pid;
1575}
1576
1577/*
1578 * Without tasklist or rcu lock it is not safe to dereference
1579 * the result of task_pgrp/task_session even if task == current,
1580 * we can race with another thread doing sys_setsid/sys_setpgid.
1581 */
1582static inline struct pid *task_pgrp(struct task_struct *task)
1583{
1584        return task->group_leader->pids[PIDTYPE_PGID].pid;
1585}
1586
1587static inline struct pid *task_session(struct task_struct *task)
1588{
1589        return task->group_leader->pids[PIDTYPE_SID].pid;
1590}
1591
1592struct pid_namespace;
1593
1594/*
1595 * the helpers to get the task's different pids as they are seen
1596 * from various namespaces
1597 *
1598 * task_xid_nr()     : global id, i.e. the id seen from the init namespace;
1599 * task_xid_vnr()    : virtual id, i.e. the id seen from the pid namespace of
1600 *                     current.
1601 * task_xid_nr_ns()  : id seen from the ns specified;
1602 *
1603 * set_task_vxid()   : assigns a virtual id to a task;
1604 *
1605 * see also pid_nr() etc in include/linux/pid.h
1606 */
1607pid_t __task_pid_nr_ns(struct task_struct *task, enum pid_type type,
1608                        struct pid_namespace *ns);
1609
1610static inline pid_t task_pid_nr(struct task_struct *tsk)
1611{
1612        return tsk->pid;
1613}
1614
1615static inline pid_t task_pid_nr_ns(struct task_struct *tsk,
1616                                        struct pid_namespace *ns)
1617{
1618        return __task_pid_nr_ns(tsk, PIDTYPE_PID, ns);
1619}
1620
1621static inline pid_t task_pid_vnr(struct task_struct *tsk)
1622{
1623        return __task_pid_nr_ns(tsk, PIDTYPE_PID, NULL);
1624}
1625
1626
1627static inline pid_t task_tgid_nr(struct task_struct *tsk)
1628{
1629        return tsk->tgid;
1630}
1631
1632pid_t task_tgid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);
1633
1634static inline pid_t task_tgid_vnr(struct task_struct *tsk)
1635{
1636        return pid_vnr(task_tgid(tsk));
1637}
1638
1639
1640static inline pid_t task_pgrp_nr_ns(struct task_struct *tsk,
1641                                        struct pid_namespace *ns)
1642{
1643        return __task_pid_nr_ns(tsk, PIDTYPE_PGID, ns);
1644}
1645
1646static inline pid_t task_pgrp_vnr(struct task_struct *tsk)
1647{
1648        return __task_pid_nr_ns(tsk, PIDTYPE_PGID, NULL);
1649}
1650
1651
1652static inline pid_t task_session_nr_ns(struct task_struct *tsk,
1653                                        struct pid_namespace *ns)
1654{
1655        return __task_pid_nr_ns(tsk, PIDTYPE_SID, ns);
1656}
1657
1658static inline pid_t task_session_vnr(struct task_struct *tsk)
1659{
1660        return __task_pid_nr_ns(tsk, PIDTYPE_SID, NULL);
1661}
1662
1663/* obsolete, do not use */
1664static inline pid_t task_pgrp_nr(struct task_struct *tsk)
1665{
1666        return task_pgrp_nr_ns(tsk, &init_pid_ns);
1667}
1668
1669/**
1670 * pid_alive - check that a task structure is not stale
1671 * @p: Task structure to be checked.
1672 *
1673 * Test if a process is not yet dead (at most zombie state)
1674 * If pid_alive fails, then pointers within the task structure
1675 * can be stale and must not be dereferenced.
1676 */
1677static inline int pid_alive(struct task_struct *p)
1678{
1679        return p->pids[PIDTYPE_PID].pid != NULL;
1680}
1681
1682/**
1683 * is_global_init - check if a task structure is init
1684 * @tsk: Task structure to be checked.
1685 *
1686 * Check if a task structure is the first user space task the kernel created.
1687 */
1688static inline int is_global_init(struct task_struct *tsk)
1689{
1690        return tsk->pid == 1;
1691}
1692
1693/*
1694 * is_container_init:
1695 * check whether in the task is init in its own pid namespace.
1696 */
1697extern int is_container_init(struct task_struct *tsk);
1698
1699extern struct pid *cad_pid;
1700
1701extern void free_task(struct task_struct *tsk);
1702#define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0)
1703
1704extern void __put_task_struct(struct task_struct *t);
1705
1706static inline void put_task_struct(struct task_struct *t)
1707{
1708        if (atomic_dec_and_test(&t->usage))
1709                __put_task_struct(t);
1710}
1711
1712extern void task_times(struct task_struct *p, cputime_t *ut, cputime_t *st);
1713extern void thread_group_times(struct task_struct *p, cputime_t *ut, cputime_t *st);
1714
1715/*
1716 * Per process flags
1717 */
1718#define PF_KSOFTIRQD    0x00000001      /* I am ksoftirqd */
1719#define PF_STARTING     0x00000002      /* being created */
1720#define PF_EXITING      0x00000004      /* getting shut down */
1721#define PF_EXITPIDONE   0x00000008      /* pi exit done on shut down */
1722#define PF_VCPU         0x00000010      /* I'm a virtual CPU */
1723#define PF_WQ_WORKER    0x00000020      /* I'm a workqueue worker */
1724#define PF_FORKNOEXEC   0x00000040      /* forked but didn't exec */
1725#define PF_MCE_PROCESS  0x00000080      /* process policy on mce errors */
1726#define PF_SUPERPRIV    0x00000100      /* used super-user privileges */
1727#define PF_DUMPCORE     0x00000200      /* dumped core */
1728#define PF_SIGNALED     0x00000400      /* killed by a signal */
1729#define PF_MEMALLOC     0x00000800      /* Allocating memory */
1730#define PF_USED_MATH    0x00002000      /* if unset the fpu must be initialized before use */
1731#define PF_FREEZING     0x00004000      /* freeze in progress. do not account to load */
1732#define PF_NOFREEZE     0x00008000      /* this thread should not be frozen */
1733#define PF_FROZEN       0x00010000      /* frozen for system suspend */
1734#define PF_FSTRANS      0x00020000      /* inside a filesystem transaction */
1735#define PF_KSWAPD       0x00040000      /* I am kswapd */
1736#define PF_OOM_ORIGIN   0x00080000      /* Allocating much memory to others */
1737#define PF_LESS_THROTTLE 0x00100000     /* Throttle me less: I clean memory */
1738#define PF_KTHREAD      0x00200000      /* I am a kernel thread */
1739#define PF_RANDOMIZE    0x00400000      /* randomize virtual address space */
1740#define PF_SWAPWRITE    0x00800000      /* Allowed to write to swap */
1741#define PF_SPREAD_PAGE  0x01000000      /* Spread page cache over cpuset */
1742#define PF_SPREAD_SLAB  0x02000000      /* Spread some slab caches over cpuset */
1743#define PF_THREAD_BOUND 0x04000000      /* Thread bound to specific cpu */
1744#define PF_MCE_EARLY    0x08000000      /* Early kill for mce process policy */
1745#define PF_MEMPOLICY    0x10000000      /* Non-default NUMA mempolicy */
1746#define PF_MUTEX_TESTER 0x20000000      /* Thread belongs to the rt mutex tester */
1747#define PF_FREEZER_SKIP 0x40000000      /* Freezer should not count it as freezable */
1748#define PF_FREEZER_NOSIG 0x80000000     /* Freezer won't send signals to it */
1749
1750/*
1751 * Only the _current_ task can read/write to tsk->flags, but other
1752 * tasks can access tsk->flags in readonly mode for example
1753 * with tsk_used_math (like during threaded core dumping).
1754 * There is however an exception to this rule during ptrace
1755 * or during fork: the ptracer task is allowed to write to the
1756 * child->flags of its traced child (same goes for fork, the parent
1757 * can write to the child->flags), because we're guaranteed the
1758 * child is not running and in turn not changing child->flags
1759 * at the same time the parent does it.
1760 */
1761#define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0)
1762#define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0)
1763#define clear_used_math() clear_stopped_child_used_math(current)
1764#define set_used_math() set_stopped_child_used_math(current)
1765#define conditional_stopped_child_used_math(condition, child) \
1766        do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0)
1767#define conditional_used_math(condition) \
1768        conditional_stopped_child_used_math(condition, current)
1769#define copy_to_stopped_child_used_math(child) \
1770        do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0)
1771/* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */
1772#define tsk_used_math(p) ((p)->flags & PF_USED_MATH)
1773#define used_math() tsk_used_math(current)
1774
1775#ifdef CONFIG_PREEMPT_RCU
1776
1777#define RCU_READ_UNLOCK_BLOCKED (1 << 0) /* blocked while in RCU read-side. */
1778#define RCU_READ_UNLOCK_BOOSTED (1 << 1) /* boosted while in RCU read-side. */
1779#define RCU_READ_UNLOCK_NEED_QS (1 << 2) /* RCU core needs CPU response. */
1780
1781static inline void rcu_copy_process(struct task_struct *p)
1782{
1783        p->rcu_read_lock_nesting = 0;
1784        p->rcu_read_unlock_special = 0;
1785#ifdef CONFIG_TREE_PREEMPT_RCU
1786        p->rcu_blocked_node = NULL;
1787#endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */
1788#ifdef CONFIG_RCU_BOOST
1789        p->rcu_boost_mutex = NULL;
1790#endif /* #ifdef CONFIG_RCU_BOOST */
1791        INIT_LIST_HEAD(&p->rcu_node_entry);
1792}
1793
1794#else
1795
1796static inline void rcu_copy_process(struct task_struct *p)
1797{
1798}
1799
1800#endif
1801
1802#ifdef CONFIG_SMP
1803extern int set_cpus_allowed_ptr(struct task_struct *p,
1804                                const struct cpumask *new_mask);
1805#else
1806static inline int set_cpus_allowed_ptr(struct task_struct *p,
1807                                       const struct cpumask *new_mask)
1808{
1809        if (!cpumask_test_cpu(0, new_mask))
1810                return -EINVAL;
1811        return 0;
1812}
1813#endif
1814
1815#ifndef CONFIG_CPUMASK_OFFSTACK
1816static inline int set_cpus_allowed(struct task_struct *p, cpumask_t new_mask)
1817{
1818        return set_cpus_allowed_ptr(p, &new_mask);
1819}
1820#endif
1821
1822/*
1823 * Do not use outside of architecture code which knows its limitations.
1824 *
1825 * sched_clock() has no promise of monotonicity or bounded drift between
1826 * CPUs, use (which you should not) requires disabling IRQs.
1827 *
1828 * Please use one of the three interfaces below.
1829 */
1830extern unsigned long long notrace sched_clock(void);
1831/*
1832 * See the comment in kernel/sched_clock.c
1833 */
1834extern u64 cpu_clock(int cpu);
1835extern u64 local_clock(void);
1836extern u64 sched_clock_cpu(int cpu);
1837
1838
1839extern void sched_clock_init(void);
1840
1841#ifndef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK
1842static inline void sched_clock_tick(void)
1843{
1844}
1845
1846static inline void sched_clock_idle_sleep_event(void)
1847{
1848}
1849
1850static inline void sched_clock_idle_wakeup_event(u64 delta_ns)
1851{
1852}
1853#else
1854/*
1855 * Architectures can set this to 1 if they have specified
1856 * CONFIG_HAVE_UNSTABLE_SCHED_CLOCK in their arch Kconfig,
1857 * but then during bootup it turns out that sched_clock()
1858 * is reliable after all:
1859 */
1860extern int sched_clock_stable;
1861
1862extern void sched_clock_tick(void);
1863extern void sched_clock_idle_sleep_event(void);
1864extern void sched_clock_idle_wakeup_event(u64 delta_ns);
1865#endif
1866
1867#ifdef CONFIG_IRQ_TIME_ACCOUNTING
1868/*
1869 * An i/f to runtime opt-in for irq time accounting based off of sched_clock.
1870 * The reason for this explicit opt-in is not to have perf penalty with
1871 * slow sched_clocks.
1872 */
1873extern void enable_sched_clock_irqtime(void);
1874extern void disable_sched_clock_irqtime(void);
1875#else
1876static inline void enable_sched_clock_irqtime(void) {}
1877static inline void disable_sched_clock_irqtime(void) {}
1878#endif
1879
1880extern unsigned long long
1881task_sched_runtime(struct task_struct *task);
1882extern unsigned long long thread_group_sched_runtime(struct task_struct *task);
1883
1884/* sched_exec is called by processes performing an exec */
1885#ifdef CONFIG_SMP
1886extern void sched_exec(void);
1887#else
1888#define sched_exec()   {}
1889#endif
1890
1891extern void sched_clock_idle_sleep_event(void);
1892extern void sched_clock_idle_wakeup_event(u64 delta_ns);
1893
1894#ifdef CONFIG_HOTPLUG_CPU
1895extern void idle_task_exit(void);
1896#else
1897static inline void idle_task_exit(void) {}
1898#endif
1899
1900#if defined(CONFIG_NO_HZ) && defined(CONFIG_SMP)
1901extern void wake_up_idle_cpu(int cpu);
1902#else
1903static inline void wake_up_idle_cpu(int cpu) { }
1904#endif
1905
1906extern unsigned int sysctl_sched_latency;
1907extern unsigned int sysctl_sched_min_granularity;
1908extern unsigned int sysctl_sched_wakeup_granularity;
1909extern unsigned int sysctl_sched_child_runs_first;
1910
1911enum sched_tunable_scaling {
1912        SCHED_TUNABLESCALING_NONE,
1913        SCHED_TUNABLESCALING_LOG,
1914        SCHED_TUNABLESCALING_LINEAR,
1915        SCHED_TUNABLESCALING_END,
1916};
1917extern enum sched_tunable_scaling sysctl_sched_tunable_scaling;
1918
1919#ifdef CONFIG_SCHED_DEBUG
1920extern unsigned int sysctl_sched_migration_cost;
1921extern unsigned int sysctl_sched_nr_migrate;
1922extern unsigned int sysctl_sched_time_avg;
1923extern unsigned int sysctl_timer_migration;
1924extern unsigned int sysctl_sched_shares_window;
1925
1926int sched_proc_update_handler(struct ctl_table *table, int write,
1927                void __user *buffer, size_t *length,
1928                loff_t *ppos);
1929#endif
1930#ifdef CONFIG_SCHED_DEBUG
1931static inline unsigned int get_sysctl_timer_migration(void)
1932{
1933        return sysctl_timer_migration;
1934}
1935#else
1936static inline unsigned int get_sysctl_timer_migration(void)
1937{
1938        return 1;
1939}
1940#endif
1941extern unsigned int sysctl_sched_rt_period;
1942extern int sysctl_sched_rt_runtime;
1943
1944int sched_rt_handler(struct ctl_table *table, int write,
1945                void __user *buffer, size_t *lenp,
1946                loff_t *ppos);
1947
1948extern unsigned int sysctl_sched_compat_yield;
1949
1950#ifdef CONFIG_SCHED_AUTOGROUP
1951extern unsigned int sysctl_sched_autogroup_enabled;
1952
1953extern void sched_autogroup_create_attach(struct task_struct *p);
1954extern void sched_autogroup_detach(struct task_struct *p);
1955extern void sched_autogroup_fork(struct signal_struct *sig);
1956extern void sched_autogroup_exit(struct signal_struct *sig);
1957#ifdef CONFIG_PROC_FS
1958extern void proc_sched_autogroup_show_task(struct task_struct *p, struct seq_file *m);
1959extern int proc_sched_autogroup_set_nice(struct task_struct *p, int *nice);
1960#endif
1961#else
1962static inline void sched_autogroup_create_attach(struct task_struct *p) { }
1963static inline void sched_autogroup_detach(struct task_struct *p) { }
1964static inline void sched_autogroup_fork(struct signal_struct *sig) { }
1965static inline void sched_autogroup_exit(struct signal_struct *sig) { }
1966#endif
1967
1968#ifdef CONFIG_RT_MUTEXES
1969extern int rt_mutex_getprio(struct task_struct *p);
1970extern void rt_mutex_setprio(struct task_struct *p, int prio);
1971extern void rt_mutex_adjust_pi(struct task_struct *p);
1972#else
1973static inline int rt_mutex_getprio(struct task_struct *p)
1974{
1975        return p->normal_prio;
1976}
1977# define rt_mutex_adjust_pi(p)          do { } while (0)
1978#endif
1979
1980extern void set_user_nice(struct task_struct *p, long nice);
1981extern int task_prio(const struct task_struct *p);
1982extern int task_nice(const struct task_struct *p);
1983extern int can_nice(const struct task_struct *p, const int nice);
1984extern int task_curr(const struct task_struct *p);
1985extern int idle_cpu(int cpu);
1986extern int sched_setscheduler(struct task_struct *, int,
1987                              const struct sched_param *);
1988extern int sched_setscheduler_nocheck(struct task_struct *, int,
1989                                      const struct sched_param *);
1990extern struct task_struct *idle_task(int cpu);
1991extern struct task_struct *curr_task(int cpu);
1992extern void set_curr_task(int cpu, struct task_struct *p);
1993
1994void yield(void);
1995
1996/*
1997 * The default (Linux) execution domain.
1998 */
1999extern struct exec_domain       default_exec_domain;
2000
2001union thread_union {
2002        struct thread_info thread_info;
2003        unsigned long stack[THREAD_SIZE/sizeof(long)];
2004};
2005
2006#ifndef __HAVE_ARCH_KSTACK_END
2007static inline int kstack_end(void *addr)
2008{
2009        /* Reliable end of stack detection:
2010         * Some APM bios versions misalign the stack
2011         */
2012        return !(((unsigned long)addr+sizeof(void*)-1) & (THREAD_SIZE-sizeof(void*)));
2013}
2014#endif
2015
2016extern union thread_union init_thread_union;
2017extern struct task_struct init_task;
2018
2019extern struct   mm_struct init_mm;
2020
2021extern struct pid_namespace init_pid_ns;
2022
2023/*
2024 * find a task by one of its numerical ids
2025 *
2026 * find_task_by_pid_ns():
2027 *      finds a task by its pid in the specified namespace
2028 * find_task_by_vpid():
2029 *      finds a task by its virtual pid
2030 *
2031 * see also find_vpid() etc in include/linux/pid.h
2032 */
2033
2034extern struct task_struct *find_task_by_vpid(pid_t nr);
2035extern struct task_struct *find_task_by_pid_ns(pid_t nr,
2036                struct pid_namespace *ns);
2037
2038extern void __set_special_pids(struct pid *pid);
2039
2040/* per-UID process charging. */
2041extern struct user_struct * alloc_uid(struct user_namespace *, uid_t);
2042static inline struct user_struct *get_uid(struct user_struct *u)
2043{
2044        atomic_inc(&u->__count);
2045        return u;
2046}
2047extern void free_uid(struct user_struct *);
2048extern void release_uids(struct user_namespace *ns);
2049
2050#include <asm/current.h>
2051
2052extern void do_timer(unsigned long ticks);
2053
2054extern int wake_up_state(struct task_struct *tsk, unsigned int state);
2055extern int wake_up_process(struct task_struct *tsk);
2056extern void wake_up_new_task(struct task_struct *tsk,
2057                                unsigned long clone_flags);
2058#ifdef CONFIG_SMP
2059 extern void kick_process(struct task_struct *tsk);
2060#else
2061 static inline void kick_process(struct task_struct *tsk) { }
2062#endif
2063extern void sched_fork(struct task_struct *p, int clone_flags);
2064extern void sched_dead(struct task_struct *p);
2065
2066extern void proc_caches_init(void);
2067extern void flush_signals(struct task_struct *);
2068extern void __flush_signals(struct task_struct *);
2069extern void ignore_signals(struct task_struct *);
2070extern void flush_signal_handlers(struct task_struct *, int force_default);
2071extern int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info);
2072
2073static inline int dequeue_signal_lock(struct task_struct *tsk, sigset_t *mask, siginfo_t *info)
2074{
2075        unsigned long flags;
2076        int ret;
2077
2078        spin_lock_irqsave(&tsk->sighand->siglock, flags);
2079        ret = dequeue_signal(tsk, mask, info);
2080        spin_unlock_irqrestore(&tsk->sighand->siglock, flags);
2081
2082        return ret;
2083}       
2084
2085extern void block_all_signals(int (*notifier)(void *priv), void *priv,
2086                              sigset_t *mask);
2087extern void unblock_all_signals(void);
2088extern void release_task(struct task_struct * p);
2089extern int send_sig_info(int, struct siginfo *, struct task_struct *);
2090extern int force_sigsegv(int, struct task_struct *);
2091extern int force_sig_info(int, struct siginfo *, struct task_struct *);
2092extern int __kill_pgrp_info(int sig, struct siginfo *info, struct pid *pgrp);
2093extern int kill_pid_info(int sig, struct siginfo *info, struct pid *pid);
2094extern int kill_pid_info_as_uid(int, struct siginfo *, struct pid *, uid_t, uid_t, u32);
2095extern int kill_pgrp(struct pid *pid, int sig, int priv);
2096extern int kill_pid(struct pid *pid, int sig, int priv);
2097extern int kill_proc_info(int, struct siginfo *, pid_t);
2098extern int do_notify_parent(struct task_struct *, int);
2099extern void __wake_up_parent(struct task_struct *p, struct task_struct *parent);
2100extern void force_sig(int, struct task_struct *);
2101extern int send_sig(int, struct task_struct *, int);
2102extern int zap_other_threads(struct task_struct *p);
2103extern struct sigqueue *sigqueue_alloc(void);
2104extern void sigqueue_free(struct sigqueue *);
2105extern int send_sigqueue(struct sigqueue *,  struct task_struct *, int group);
2106extern int do_sigaction(int, struct k_sigaction *, struct k_sigaction *);
2107extern int do_sigaltstack(const stack_t __user *, stack_t __user *, unsigned long);
2108
2109static inline int kill_cad_pid(int sig, int priv)
2110{
2111        return kill_pid(cad_pid, sig, priv);
2112}
2113
2114/* These can be the second arg to send_sig_info/send_group_sig_info.  */
2115#define SEND_SIG_NOINFO ((struct siginfo *) 0)
2116#define SEND_SIG_PRIV   ((struct siginfo *) 1)
2117#define SEND_SIG_FORCED ((struct siginfo *) 2)
2118
2119/*
2120 * True if we are on the alternate signal stack.
2121 */
2122static inline int on_sig_stack(unsigned long sp)
2123{
2124#ifdef CONFIG_STACK_GROWSUP
2125        return sp >= current->sas_ss_sp &&
2126                sp - current->sas_ss_sp < current->sas_ss_size;
2127#else
2128        return sp > current->sas_ss_sp &&
2129                sp - current->sas_ss_sp <= current->sas_ss_size;
2130#endif
2131}
2132
2133static inline int sas_ss_flags(unsigned long sp)
2134{
2135        return (current->sas_ss_size == 0 ? SS_DISABLE
2136                : on_sig_stack(sp) ? SS_ONSTACK : 0);
2137}
2138
2139/*
2140 * Routines for handling mm_structs
2141 */
2142extern struct mm_struct * mm_alloc(void);
2143
2144/* mmdrop drops the mm and the page tables */
2145extern void __mmdrop(struct mm_struct *);
2146static inline void mmdrop(struct mm_struct * mm)
2147{
2148        if (unlikely(atomic_dec_and_test(&mm->mm_count)))
2149                __mmdrop(mm);
2150}
2151
2152/* mmput gets rid of the mappings and all user-space */
2153extern void mmput(struct mm_struct *);
2154/* Grab a reference to a task's mm, if it is not already going away */
2155extern struct mm_struct *get_task_mm(struct task_struct *task);
2156/* Remove the current tasks stale references to the old mm_struct */
2157extern void mm_release(struct task_struct *, struct mm_struct *);
2158/* Allocate a new mm structure and copy contents from tsk->mm */
2159extern struct mm_struct *dup_mm(struct task_struct *tsk);
2160
2161extern int copy_thread(unsigned long, unsigned long, unsigned long,
2162                        struct task_struct *, struct pt_regs *);
2163extern void flush_thread(void);
2164extern void exit_thread(void);
2165
2166extern void exit_files(struct task_struct *);
2167extern void __cleanup_sighand(struct sighand_struct *);
2168
2169extern void exit_itimers(struct signal_struct *);
2170extern void flush_itimer_signals(void);
2171
2172extern NORET_TYPE void do_group_exit(int);
2173
2174extern void daemonize(const char *, ...);
2175extern int allow_signal(int);
2176extern int disallow_signal(int);
2177
2178extern int do_execve(const char *,
2179                     const char __user * const __user *,
2180                     const char __user * const __user *, struct pt_regs *);
2181extern long do_fork(unsigned long, unsigned long, struct pt_regs *, unsigned long, int __user *, int __user *);
2182struct task_struct *fork_idle(int);
2183
2184extern void set_task_comm(struct task_struct *tsk, char *from);
2185extern char *get_task_comm(char *to, struct task_struct *tsk);
2186
2187#ifdef CONFIG_SMP
2188extern unsigned long wait_task_inactive(struct task_struct *, long match_state);
2189#else
2190static inline unsigned long wait_task_inactive(struct task_struct *p,
2191                                               long match_state)
2192{
2193        return 1;
2194}
2195#endif
2196
2197#define next_task(p) \
2198        list_entry_rcu((p)->tasks.next, struct task_struct, tasks)
2199
2200#define for_each_process(p) \
2201        for (p = &init_task ; (p = next_task(p)) != &init_task ; )
2202
2203extern bool current_is_single_threaded(void);
2204
2205/*
2206 * Careful: do_each_thread/while_each_thread is a double loop so
2207 *          'break' will not work as expected - use goto instead.
2208 */
2209#define do_each_thread(g, t) \
2210        for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do
2211
2212#define while_each_thread(g, t) \
2213        while ((t = next_thread(t)) != g)
2214
2215static inline int get_nr_threads(struct task_struct *tsk)
2216{
2217        return tsk->signal->nr_threads;
2218}
2219
2220/* de_thread depends on thread_group_leader not being a pid based check */
2221#define thread_group_leader(p)  (p == p->group_leader)
2222
2223/* Do to the insanities of de_thread it is possible for a process
2224 * to have the pid of the thread group leader without actually being
2225 * the thread group leader.  For iteration through the pids in proc
2226 * all we care about is that we have a task with the appropriate
2227 * pid, we don't actually care if we have the right task.
2228 */
2229static inline int has_group_leader_pid(struct task_struct *p)
2230{
2231        return p->pid == p->tgid;
2232}
2233
2234static inline
2235int same_thread_group(struct task_struct *p1, struct task_struct *p2)
2236{
2237        return p1->tgid == p2->tgid;
2238}
2239
2240static inline struct task_struct *next_thread(const struct task_struct *p)
2241{
2242        return list_entry_rcu(p->thread_group.next,
2243                              struct task_struct, thread_group);
2244}
2245
2246static inline int thread_group_empty(struct task_struct *p)
2247{
2248        return list_empty(&p->thread_group);
2249}
2250
2251#define delay_group_leader(p) \
2252                (thread_group_leader(p) && !thread_group_empty(p))
2253
2254static inline int task_detached(struct task_struct *p)
2255{
2256        return p->exit_signal == -1;
2257}
2258
2259/*
2260 * Protects ->fs, ->files, ->mm, ->group_info, ->comm, keyring
2261 * subscriptions and synchronises with wait4().  Also used in procfs.  Also
2262 * pins the final release of task.io_context.  Also protects ->cpuset and
2263 * ->cgroup.subsys[].
2264 *
2265 * Nests both inside and outside of read_lock(&tasklist_lock).
2266 * It must not be nested with write_lock_irq(&tasklist_lock),
2267 * neither inside nor outside.
2268 */
2269static inline void task_lock(struct task_struct *p)
2270{
2271        spin_lock(&p->alloc_lock);
2272}
2273
2274static inline void task_unlock(struct task_struct *p)
2275{
2276        spin_unlock(&p->alloc_lock);
2277}
2278
2279extern struct sighand_struct *__lock_task_sighand(struct task_struct *tsk,
2280                                                        unsigned long *flags);
2281
2282#define lock_task_sighand(tsk, flags)                                   \
2283({      struct sighand_struct *__ss;                                    \
2284        __cond_lock(&(tsk)->sighand->siglock,                           \
2285                    (__ss = __lock_task_sighand(tsk, flags)));          \
2286        __ss;                                                           \
2287})                                                                      \
2288
2289static inline void unlock_task_sighand(struct task_struct *tsk,
2290                                                unsigned long *flags)
2291{
2292        spin_unlock_irqrestore(&tsk->sighand->siglock, *flags);
2293}
2294
2295#ifndef __HAVE_THREAD_FUNCTIONS
2296
2297#define task_thread_info(task)  ((struct thread_info *)(task)->stack)
2298#define task_stack_page(task)   ((task)->stack)
2299
2300static inline void setup_thread_stack(struct task_struct *p, struct task_struct *org)
2301{
2302        *task_thread_info(p) = *task_thread_info(org);
2303        task_thread_info(p)->task = p;
2304}
2305
2306static inline unsigned long *end_of_stack(struct task_struct *p)
2307{
2308        return (unsigned long *)(task_thread_info(p) + 1);
2309}
2310
2311#endif
2312
2313static inline int object_is_on_stack(void *obj)
2314{
2315        void *stack = task_stack_page(current);
2316
2317        return (obj >= stack) && (obj < (stack + THREAD_SIZE));
2318}
2319
2320extern void thread_info_cache_init(void);
2321
2322#ifdef CONFIG_DEBUG_STACK_USAGE
2323static inline unsigned long stack_not_used(struct task_struct *p)
2324{
2325        unsigned long *n = end_of_stack(p);
2326
2327        do {    /* Skip over canary */
2328                n++;
2329        } while (!*n);
2330
2331        return (unsigned long)n - (unsigned long)end_of_stack(p);
2332}
2333#endif
2334
2335/* set thread flags in other task's structures
2336 * - see asm/thread_info.h for TIF_xxxx flags available
2337 */
2338static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag)
2339{
2340        set_ti_thread_flag(task_thread_info(tsk), flag);
2341}
2342
2343static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag)
2344{
2345        clear_ti_thread_flag(task_thread_info(tsk), flag);
2346}
2347
2348static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag)
2349{
2350        return test_and_set_ti_thread_flag(task_thread_info(tsk), flag);
2351}
2352
2353static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag)
2354{
2355        return test_and_clear_ti_thread_flag(task_thread_info(tsk), flag);
2356}
2357
2358static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag)
2359{
2360        return test_ti_thread_flag(task_thread_info(tsk), flag);
2361}
2362
2363static inline void set_tsk_need_resched(struct task_struct *tsk)
2364{
2365        set_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
2366}
2367
2368static inline void clear_tsk_need_resched(struct task_struct *tsk)
2369{
2370        clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
2371}
2372
2373static inline int test_tsk_need_resched(struct task_struct *tsk)
2374{
2375        return unlikely(test_tsk_thread_flag(tsk,TIF_NEED_RESCHED));
2376}
2377
2378static inline int restart_syscall(void)
2379{
2380        set_tsk_thread_flag(current, TIF_SIGPENDING);
2381        return -ERESTARTNOINTR;
2382}
2383
2384static inline int signal_pending(struct task_struct *p)
2385{
2386        return unlikely(test_tsk_thread_flag(p,TIF_SIGPENDING));
2387}
2388
2389static inline int __fatal_signal_pending(struct task_struct *p)
2390{
2391        return unlikely(sigismember(&p->pending.signal, SIGKILL));
2392}
2393
2394static inline int fatal_signal_pending(struct task_struct *p)
2395{
2396        return signal_pending(p) && __fatal_signal_pending(p);
2397}
2398
2399static inline int signal_pending_state(long state, struct task_struct *p)
2400{
2401        if (!(state & (TASK_INTERRUPTIBLE | TASK_WAKEKILL)))
2402                return 0;
2403        if (!signal_pending(p))
2404                return 0;
2405
2406        return (state & TASK_INTERRUPTIBLE) || __fatal_signal_pending(p);
2407}
2408
2409static inline int need_resched(void)
2410{
2411        return unlikely(test_thread_flag(TIF_NEED_RESCHED));
2412}
2413
2414/*
2415 * cond_resched() and cond_resched_lock(): latency reduction via
2416 * explicit rescheduling in places that are safe. The return
2417 * value indicates whether a reschedule was done in fact.
2418 * cond_resched_lock() will drop the spinlock before scheduling,
2419 * cond_resched_softirq() will enable bhs before scheduling.
2420 */
2421extern int _cond_resched(void);
2422
2423#define cond_resched() ({                       \
2424        __might_sleep(__FILE__, __LINE__, 0);   \
2425        _cond_resched();                        \
2426})
2427
2428extern int __cond_resched_lock(spinlock_t *lock);
2429
2430#ifdef CONFIG_PREEMPT
2431#define PREEMPT_LOCK_OFFSET     PREEMPT_OFFSET
2432#else
2433#define PREEMPT_LOCK_OFFSET     0
2434#endif
2435
2436#define cond_resched_lock(lock) ({                              \
2437        __might_sleep(__FILE__, __LINE__, PREEMPT_LOCK_OFFSET); \
2438        __cond_resched_lock(lock);                              \
2439})
2440
2441extern int __cond_resched_softirq(void);
2442
2443#define cond_resched_softirq() ({                                       \
2444        __might_sleep(__FILE__, __LINE__, SOFTIRQ_DISABLE_OFFSET);      \
2445        __cond_resched_softirq();                                       \
2446})
2447
2448/*
2449 * Does a critical section need to be broken due to another
2450 * task waiting?: (technically does not depend on CONFIG_PREEMPT,
2451 * but a general need for low latency)
2452 */
2453static inline int spin_needbreak(spinlock_t *lock)
2454{
2455#ifdef CONFIG_PREEMPT
2456        return spin_is_contended(lock);
2457#else
2458        return 0;
2459#endif
2460}
2461
2462/*
2463 * Thread group CPU time accounting.
2464 */
2465void thread_group_cputime(struct task_struct *tsk, struct task_cputime *times);
2466void thread_group_cputimer(struct task_struct *tsk, struct task_cputime *times);
2467
2468static inline void thread_group_cputime_init(struct signal_struct *sig)
2469{
2470        spin_lock_init(&sig->cputimer.lock);
2471}
2472
2473/*
2474 * Reevaluate whether the task has signals pending delivery.
2475 * Wake the task if so.
2476 * This is required every time the blocked sigset_t changes.
2477 * callers must hold sighand->siglock.
2478 */
2479extern void recalc_sigpending_and_wake(struct task_struct *t);
2480extern void recalc_sigpending(void);
2481
2482extern void signal_wake_up(struct task_struct *t, int resume_stopped);
2483
2484/*
2485 * Wrappers for p->thread_info->cpu access. No-op on UP.
2486 */
2487#ifdef CONFIG_SMP
2488
2489static inline unsigned int task_cpu(const struct task_struct *p)
2490{
2491        return task_thread_info(p)->cpu;
2492}
2493
2494extern void set_task_cpu(struct task_struct *p, unsigned int cpu);
2495
2496#else
2497
2498static inline unsigned int task_cpu(const struct task_struct *p)
2499{
2500        return 0;
2501}
2502
2503static inline void set_task_cpu(struct task_struct *p, unsigned int cpu)
2504{
2505}
2506
2507#endif /* CONFIG_SMP */
2508
2509extern long sched_setaffinity(pid_t pid, const struct cpumask *new_mask);
2510extern long sched_getaffinity(pid_t pid, struct cpumask *mask);
2511
2512extern void normalize_rt_tasks(void);
2513
2514#ifdef CONFIG_CGROUP_SCHED
2515
2516extern struct task_group root_task_group;
2517
2518extern struct task_group *sched_create_group(struct task_group *parent);
2519extern void sched_destroy_group(struct task_group *tg);
2520extern void sched_move_task(struct task_struct *tsk);
2521#ifdef CONFIG_FAIR_GROUP_SCHED
2522extern int sched_group_set_shares(struct task_group *tg, unsigned long shares);
2523extern unsigned long sched_group_shares(struct task_group *tg);
2524#endif
2525#ifdef CONFIG_RT_GROUP_SCHED
2526extern int sched_group_set_rt_runtime(struct task_group *tg,
2527                                      long rt_runtime_us);
2528extern long sched_group_rt_runtime(struct task_group *tg);
2529extern int sched_group_set_rt_period(struct task_group *tg,
2530                                      long rt_period_us);
2531extern long sched_group_rt_period(struct task_group *tg);
2532extern int sched_rt_can_attach(struct task_group *tg, struct task_struct *tsk);
2533#endif
2534#endif
2535
2536extern int task_can_switch_user(struct user_struct *up,
2537                                        struct task_struct *tsk);
2538
2539#ifdef CONFIG_TASK_XACCT
2540static inline void add_rchar(struct task_struct *tsk, ssize_t amt)
2541{
2542        tsk->ioac.rchar += amt;
2543}
2544
2545static inline void add_wchar(struct task_struct *tsk, ssize_t amt)
2546{
2547        tsk->ioac.wchar += amt;
2548}
2549
2550static inline void inc_syscr(struct task_struct *tsk)
2551{
2552        tsk->ioac.syscr++;
2553}
2554
2555static inline void inc_syscw(struct task_struct *tsk)
2556{
2557        tsk->ioac.syscw++;
2558}
2559#else
2560static inline void add_rchar(struct task_struct *tsk, ssize_t amt)
2561{
2562}
2563
2564static inline void add_wchar(struct task_struct *tsk, ssize_t amt)
2565{
2566}
2567
2568static inline void inc_syscr(struct task_struct *tsk)
2569{
2570}
2571
2572static inline void inc_syscw(struct task_struct *tsk)
2573{
2574}
2575#endif
2576
2577#ifndef TASK_SIZE_OF
2578#define TASK_SIZE_OF(tsk)       TASK_SIZE
2579#endif
2580
2581/*
2582 * Call the function if the target task is executing on a CPU right now:
2583 */
2584extern void task_oncpu_function_call(struct task_struct *p,
2585                                     void (*func) (void *info), void *info);
2586
2587
2588#ifdef CONFIG_MM_OWNER
2589extern void mm_update_next_owner(struct mm_struct *mm);
2590extern void mm_init_owner(struct mm_struct *mm, struct task_struct *p);
2591#else
2592static inline void mm_update_next_owner(struct mm_struct *mm)
2593{
2594}
2595
2596static inline void mm_init_owner(struct mm_struct *mm, struct task_struct *p)
2597{
2598}
2599#endif /* CONFIG_MM_OWNER */
2600
2601static inline unsigned long task_rlimit(const struct task_struct *tsk,
2602                unsigned int limit)
2603{
2604        return ACCESS_ONCE(tsk->signal->rlim[limit].rlim_cur);
2605}
2606
2607static inline unsigned long task_rlimit_max(const struct task_struct *tsk,
2608                unsigned int limit)
2609{
2610        return ACCESS_ONCE(tsk->signal->rlim[limit].rlim_max);
2611}
2612
2613static inline unsigned long rlimit(unsigned int limit)
2614{
2615        return task_rlimit(current, limit);
2616}
2617
2618static inline unsigned long rlimit_max(unsigned int limit)
2619{
2620        return task_rlimit_max(current, limit);
2621}
2622
2623#endif /* __KERNEL__ */
2624
2625#endif
2626
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