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#define CLONE_STOPPED           0x02000000      /* Start in stopped state */
  25#define CLONE_NEWUTS            0x04000000      /* New utsname group? */
  26#define CLONE_NEWIPC            0x08000000      /* New ipcs */
  27#define CLONE_NEWUSER           0x10000000      /* New user namespace */
  28#define CLONE_NEWPID            0x20000000      /* New pid namespace */
  29#define CLONE_NEWNET            0x40000000      /* New network namespace */
  30#define CLONE_IO                0x80000000      /* Clone io context */
  31
  32/*
  33 * Scheduling policies
  34 */
  35#define SCHED_NORMAL            0
  36#define SCHED_FIFO              1
  37#define SCHED_RR                2
  38#define SCHED_BATCH             3
  39/* SCHED_ISO: reserved but not implemented yet */
  40#define SCHED_IDLE              5
  41
  42#ifdef __KERNEL__
  43
  44struct sched_param {
  45        int sched_priority;
  46};
  47
  48#include <asm/param.h>  /* for HZ */
  49
  50#include <linux/capability.h>
  51#include <linux/threads.h>
  52#include <linux/kernel.h>
  53#include <linux/types.h>
  54#include <linux/timex.h>
  55#include <linux/jiffies.h>
  56#include <linux/rbtree.h>
  57#include <linux/thread_info.h>
  58#include <linux/cpumask.h>
  59#include <linux/errno.h>
  60#include <linux/nodemask.h>
  61#include <linux/mm_types.h>
  62
  63#include <asm/system.h>
  64#include <asm/page.h>
  65#include <asm/ptrace.h>
  66#include <asm/cputime.h>
  67
  68#include <linux/smp.h>
  69#include <linux/sem.h>
  70#include <linux/signal.h>
  71#include <linux/fs_struct.h>
  72#include <linux/compiler.h>
  73#include <linux/completion.h>
  74#include <linux/pid.h>
  75#include <linux/percpu.h>
  76#include <linux/topology.h>
  77#include <linux/proportions.h>
  78#include <linux/seccomp.h>
  79#include <linux/rcupdate.h>
  80#include <linux/rtmutex.h>
  81
  82#include <linux/time.h>
  83#include <linux/param.h>
  84#include <linux/resource.h>
  85#include <linux/timer.h>
  86#include <linux/hrtimer.h>
  87#include <linux/task_io_accounting.h>
  88#include <linux/kobject.h>
  89#include <linux/latencytop.h>
  90
  91#include <asm/processor.h>
  92
  93struct mem_cgroup;
  94struct exec_domain;
  95struct futex_pi_state;
  96struct robust_list_head;
  97struct bio;
  98
  99/*
 100 * List of flags we want to share for kernel threads,
 101 * if only because they are not used by them anyway.
 102 */
 103#define CLONE_KERNEL    (CLONE_FS | CLONE_FILES | CLONE_SIGHAND)
 104
 105/*
 106 * These are the constant used to fake the fixed-point load-average
 107 * counting. Some notes:
 108 *  - 11 bit fractions expand to 22 bits by the multiplies: this gives
 109 *    a load-average precision of 10 bits integer + 11 bits fractional
 110 *  - if you want to count load-averages more often, you need more
 111 *    precision, or rounding will get you. With 2-second counting freq,
 112 *    the EXP_n values would be 1981, 2034 and 2043 if still using only
 113 *    11 bit fractions.
 114 */
 115extern unsigned long avenrun[];         /* Load averages */
 116
 117#define FSHIFT          11              /* nr of bits of precision */
 118#define FIXED_1         (1<<FSHIFT)     /* 1.0 as fixed-point */
 119#define LOAD_FREQ       (5*HZ+1)        /* 5 sec intervals */
 120#define EXP_1           1884            /* 1/exp(5sec/1min) as fixed-point */
 121#define EXP_5           2014            /* 1/exp(5sec/5min) */
 122#define EXP_15          2037            /* 1/exp(5sec/15min) */
 123
 124#define CALC_LOAD(load,exp,n) \
 125        load *= exp; \
 126        load += n*(FIXED_1-exp); \
 127        load >>= FSHIFT;
 128
 129extern unsigned long total_forks;
 130extern int nr_threads;
 131DECLARE_PER_CPU(unsigned long, process_counts);
 132extern int nr_processes(void);
 133extern unsigned long nr_running(void);
 134extern unsigned long nr_uninterruptible(void);
 135extern unsigned long nr_active(void);
 136extern unsigned long nr_iowait(void);
 137extern unsigned long weighted_cpuload(const int cpu);
 138
 139struct seq_file;
 140struct cfs_rq;
 141struct task_group;
 142#ifdef CONFIG_SCHED_DEBUG
 143extern void proc_sched_show_task(struct task_struct *p, struct seq_file *m);
 144extern void proc_sched_set_task(struct task_struct *p);
 145extern void
 146print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq);
 147#else
 148static inline void
 149proc_sched_show_task(struct task_struct *p, struct seq_file *m)
 150{
 151}
 152static inline void proc_sched_set_task(struct task_struct *p)
 153{
 154}
 155static inline void
 156print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)
 157{
 158}
 159#endif
 160
 161extern unsigned long long time_sync_thresh;
 162
 163/*
 164 * Task state bitmask. NOTE! These bits are also
 165 * encoded in fs/proc/array.c: get_task_state().
 166 *
 167 * We have two separate sets of flags: task->state
 168 * is about runnability, while task->exit_state are
 169 * about the task exiting. Confusing, but this way
 170 * modifying one set can't modify the other one by
 171 * mistake.
 172 */
 173#define TASK_RUNNING            0
 174#define TASK_INTERRUPTIBLE      1
 175#define TASK_UNINTERRUPTIBLE    2
 176#define __TASK_STOPPED          4
 177#define __TASK_TRACED           8
 178/* in tsk->exit_state */
 179#define EXIT_ZOMBIE             16
 180#define EXIT_DEAD               32
 181/* in tsk->state again */
 182#define TASK_DEAD               64
 183#define TASK_WAKEKILL           128
 184
 185/* Convenience macros for the sake of set_task_state */
 186#define TASK_KILLABLE           (TASK_WAKEKILL | TASK_UNINTERRUPTIBLE)
 187#define TASK_STOPPED            (TASK_WAKEKILL | __TASK_STOPPED)
 188#define TASK_TRACED             (TASK_WAKEKILL | __TASK_TRACED)
 189
 190/* Convenience macros for the sake of wake_up */
 191#define TASK_NORMAL             (TASK_INTERRUPTIBLE | TASK_UNINTERRUPTIBLE)
 192#define TASK_ALL                (TASK_NORMAL | __TASK_STOPPED | __TASK_TRACED)
 193
 194/* get_task_state() */
 195#define TASK_REPORT             (TASK_RUNNING | TASK_INTERRUPTIBLE | \
 196                                 TASK_UNINTERRUPTIBLE | __TASK_STOPPED | \
 197                                 __TASK_TRACED)
 198
 199#define task_is_traced(task)    ((task->state & __TASK_TRACED) != 0)
 200#define task_is_stopped(task)   ((task->state & __TASK_STOPPED) != 0)
 201#define task_is_stopped_or_traced(task) \
 202                        ((task->state & (__TASK_STOPPED | __TASK_TRACED)) != 0)
 203#define task_contributes_to_load(task)  \
 204                                ((task->state & TASK_UNINTERRUPTIBLE) != 0)
 205
 206#define __set_task_state(tsk, state_value)              \
 207        do { (tsk)->state = (state_value); } while (0)
 208#define set_task_state(tsk, state_value)                \
 209        set_mb((tsk)->state, (state_value))
 210
 211/*
 212 * set_current_state() includes a barrier so that the write of current->state
 213 * is correctly serialised wrt the caller's subsequent test of whether to
 214 * actually sleep:
 215 *
 216 *      set_current_state(TASK_UNINTERRUPTIBLE);
 217 *      if (do_i_need_to_sleep())
 218 *              schedule();
 219 *
 220 * If the caller does not need such serialisation then use __set_current_state()
 221 */
 222#define __set_current_state(state_value)                        \
 223        do { current->state = (state_value); } while (0)
 224#define set_current_state(state_value)          \
 225        set_mb(current->state, (state_value))
 226
 227/* Task command name length */
 228#define TASK_COMM_LEN 16
 229
 230#include <linux/spinlock.h>
 231
 232/*
 233 * This serializes "schedule()" and also protects
 234 * the run-queue from deletions/modifications (but
 235 * _adding_ to the beginning of the run-queue has
 236 * a separate lock).
 237 */
 238extern rwlock_t tasklist_lock;
 239extern spinlock_t mmlist_lock;
 240
 241struct task_struct;
 242
 243extern void sched_init(void);
 244extern void sched_init_smp(void);
 245extern asmlinkage void schedule_tail(struct task_struct *prev);
 246extern void init_idle(struct task_struct *idle, int cpu);
 247extern void init_idle_bootup_task(struct task_struct *idle);
 248
 249extern cpumask_t nohz_cpu_mask;
 250#if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ)
 251extern int select_nohz_load_balancer(int cpu);
 252#else
 253static inline int select_nohz_load_balancer(int cpu)
 254{
 255        return 0;
 256}
 257#endif
 258
 259extern unsigned long rt_needs_cpu(int cpu);
 260
 261/*
 262 * Only dump TASK_* tasks. (0 for all tasks)
 263 */
 264extern void show_state_filter(unsigned long state_filter);
 265
 266static inline void show_state(void)
 267{
 268        show_state_filter(0);
 269}
 270
 271extern void show_regs(struct pt_regs *);
 272
 273/*
 274 * TASK is a pointer to the task whose backtrace we want to see (or NULL for current
 275 * task), SP is the stack pointer of the first frame that should be shown in the back
 276 * trace (or NULL if the entire call-chain of the task should be shown).
 277 */
 278extern void show_stack(struct task_struct *task, unsigned long *sp);
 279
 280void io_schedule(void);
 281long io_schedule_timeout(long timeout);
 282
 283extern void cpu_init (void);
 284extern void trap_init(void);
 285extern void account_process_tick(struct task_struct *task, int user);
 286extern void update_process_times(int user);
 287extern void scheduler_tick(void);
 288extern void hrtick_resched(void);
 289
 290extern void sched_show_task(struct task_struct *p);
 291
 292#ifdef CONFIG_DETECT_SOFTLOCKUP
 293extern void softlockup_tick(void);
 294extern void spawn_softlockup_task(void);
 295extern void touch_softlockup_watchdog(void);
 296extern void touch_all_softlockup_watchdogs(void);
 297extern unsigned long  softlockup_thresh;
 298extern unsigned long sysctl_hung_task_check_count;
 299extern unsigned long sysctl_hung_task_timeout_secs;
 300extern unsigned long sysctl_hung_task_warnings;
 301#else
 302static inline void softlockup_tick(void)
 303{
 304}
 305static inline void spawn_softlockup_task(void)
 306{
 307}
 308static inline void touch_softlockup_watchdog(void)
 309{
 310}
 311static inline void touch_all_softlockup_watchdogs(void)
 312{
 313}
 314#endif
 315
 316
 317/* Attach to any functions which should be ignored in wchan output. */
 318#define __sched         __attribute__((__section__(".sched.text")))
 319
 320/* Linker adds these: start and end of __sched functions */
 321extern char __sched_text_start[], __sched_text_end[];
 322
 323/* Is this address in the __sched functions? */
 324extern int in_sched_functions(unsigned long addr);
 325
 326#define MAX_SCHEDULE_TIMEOUT    LONG_MAX
 327extern signed long schedule_timeout(signed long timeout);
 328extern signed long schedule_timeout_interruptible(signed long timeout);
 329extern signed long schedule_timeout_killable(signed long timeout);
 330extern signed long schedule_timeout_uninterruptible(signed long timeout);
 331asmlinkage void schedule(void);
 332
 333struct nsproxy;
 334struct user_namespace;
 335
 336/* Maximum number of active map areas.. This is a random (large) number */
 337#define DEFAULT_MAX_MAP_COUNT   65536
 338
 339extern int sysctl_max_map_count;
 340
 341#include <linux/aio.h>
 342
 343extern unsigned long
 344arch_get_unmapped_area(struct file *, unsigned long, unsigned long,
 345                       unsigned long, unsigned long);
 346extern unsigned long
 347arch_get_unmapped_area_topdown(struct file *filp, unsigned long addr,
 348                          unsigned long len, unsigned long pgoff,
 349                          unsigned long flags);
 350extern void arch_unmap_area(struct mm_struct *, unsigned long);
 351extern void arch_unmap_area_topdown(struct mm_struct *, unsigned long);
 352
 353#if NR_CPUS >= CONFIG_SPLIT_PTLOCK_CPUS
 354/*
 355 * The mm counters are not protected by its page_table_lock,
 356 * so must be incremented atomically.
 357 */
 358#define set_mm_counter(mm, member, value) atomic_long_set(&(mm)->_##member, value)
 359#define get_mm_counter(mm, member) ((unsigned long)atomic_long_read(&(mm)->_##member))
 360#define add_mm_counter(mm, member, value) atomic_long_add(value, &(mm)->_##member)
 361#define inc_mm_counter(mm, member) atomic_long_inc(&(mm)->_##member)
 362#define dec_mm_counter(mm, member) atomic_long_dec(&(mm)->_##member)
 363
 364#else  /* NR_CPUS < CONFIG_SPLIT_PTLOCK_CPUS */
 365/*
 366 * The mm counters are protected by its page_table_lock,
 367 * so can be incremented directly.
 368 */
 369#define set_mm_counter(mm, member, value) (mm)->_##member = (value)
 370#define get_mm_counter(mm, member) ((mm)->_##member)
 371#define add_mm_counter(mm, member, value) (mm)->_##member += (value)
 372#define inc_mm_counter(mm, member) (mm)->_##member++
 373#define dec_mm_counter(mm, member) (mm)->_##member--
 374
 375#endif /* NR_CPUS < CONFIG_SPLIT_PTLOCK_CPUS */
 376
 377#define get_mm_rss(mm)                                  \
 378        (get_mm_counter(mm, file_rss) + get_mm_counter(mm, anon_rss))
 379#define update_hiwater_rss(mm)  do {                    \
 380        unsigned long _rss = get_mm_rss(mm);            \
 381        if ((mm)->hiwater_rss < _rss)                   \
 382                (mm)->hiwater_rss = _rss;               \
 383} while (0)
 384#define update_hiwater_vm(mm)   do {                    \
 385        if ((mm)->hiwater_vm < (mm)->total_vm)          \
 386                (mm)->hiwater_vm = (mm)->total_vm;      \
 387} while (0)
 388
 389extern void set_dumpable(struct mm_struct *mm, int value);
 390extern int get_dumpable(struct mm_struct *mm);
 391
 392/* mm flags */
 393/* dumpable bits */
 394#define MMF_DUMPABLE      0  /* core dump is permitted */
 395#define MMF_DUMP_SECURELY 1  /* core file is readable only by root */
 396#define MMF_DUMPABLE_BITS 2
 397
 398/* coredump filter bits */
 399#define MMF_DUMP_ANON_PRIVATE   2
 400#define MMF_DUMP_ANON_SHARED    3
 401#define MMF_DUMP_MAPPED_PRIVATE 4
 402#define MMF_DUMP_MAPPED_SHARED  5
 403#define MMF_DUMP_ELF_HEADERS    6
 404#define MMF_DUMP_FILTER_SHIFT   MMF_DUMPABLE_BITS
 405#define MMF_DUMP_FILTER_BITS    5
 406#define MMF_DUMP_FILTER_MASK \
 407        (((1 << MMF_DUMP_FILTER_BITS) - 1) << MMF_DUMP_FILTER_SHIFT)
 408#define MMF_DUMP_FILTER_DEFAULT \
 409        ((1 << MMF_DUMP_ANON_PRIVATE) | (1 << MMF_DUMP_ANON_SHARED))
 410
 411struct sighand_struct {
 412        atomic_t                count;
 413        struct k_sigaction      action[_NSIG];
 414        spinlock_t              siglock;
 415        wait_queue_head_t       signalfd_wqh;
 416};
 417
 418struct pacct_struct {
 419        int                     ac_flag;
 420        long                    ac_exitcode;
 421        unsigned long           ac_mem;
 422        cputime_t               ac_utime, ac_stime;
 423        unsigned long           ac_minflt, ac_majflt;
 424};
 425
 426/*
 427 * NOTE! "signal_struct" does not have it's own
 428 * locking, because a shared signal_struct always
 429 * implies a shared sighand_struct, so locking
 430 * sighand_struct is always a proper superset of
 431 * the locking of signal_struct.
 432 */
 433struct signal_struct {
 434        atomic_t                count;
 435        atomic_t                live;
 436
 437        wait_queue_head_t       wait_chldexit;  /* for wait4() */
 438
 439        /* current thread group signal load-balancing target: */
 440        struct task_struct      *curr_target;
 441
 442        /* shared signal handling: */
 443        struct sigpending       shared_pending;
 444
 445        /* thread group exit support */
 446        int                     group_exit_code;
 447        /* overloaded:
 448         * - notify group_exit_task when ->count is equal to notify_count
 449         * - everyone except group_exit_task is stopped during signal delivery
 450         *   of fatal signals, group_exit_task processes the signal.
 451         */
 452        struct task_struct      *group_exit_task;
 453        int                     notify_count;
 454
 455        /* thread group stop support, overloads group_exit_code too */
 456        int                     group_stop_count;
 457        unsigned int            flags; /* see SIGNAL_* flags below */
 458
 459        /* POSIX.1b Interval Timers */
 460        struct list_head posix_timers;
 461
 462        /* ITIMER_REAL timer for the process */
 463        struct hrtimer real_timer;
 464        struct pid *leader_pid;
 465        ktime_t it_real_incr;
 466
 467        /* ITIMER_PROF and ITIMER_VIRTUAL timers for the process */
 468        cputime_t it_prof_expires, it_virt_expires;
 469        cputime_t it_prof_incr, it_virt_incr;
 470
 471        /* job control IDs */
 472
 473        /*
 474         * pgrp and session fields are deprecated.
 475         * use the task_session_Xnr and task_pgrp_Xnr routines below
 476         */
 477
 478        union {
 479                pid_t pgrp __deprecated;
 480                pid_t __pgrp;
 481        };
 482
 483        struct pid *tty_old_pgrp;
 484
 485        union {
 486                pid_t session __deprecated;
 487                pid_t __session;
 488        };
 489
 490        /* boolean value for session group leader */
 491        int leader;
 492
 493        struct tty_struct *tty; /* NULL if no tty */
 494
 495        /*
 496         * Cumulative resource counters for dead threads in the group,
 497         * and for reaped dead child processes forked by this group.
 498         * Live threads maintain their own counters and add to these
 499         * in __exit_signal, except for the group leader.
 500         */
 501        cputime_t utime, stime, cutime, cstime;
 502        cputime_t gtime;
 503        cputime_t cgtime;
 504        unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw;
 505        unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt;
 506        unsigned long inblock, oublock, cinblock, coublock;
 507
 508        /*
 509         * Cumulative ns of scheduled CPU time for dead threads in the
 510         * group, not including a zombie group leader.  (This only differs
 511         * from jiffies_to_ns(utime + stime) if sched_clock uses something
 512         * other than jiffies.)
 513         */
 514        unsigned long long sum_sched_runtime;
 515
 516        /*
 517         * We don't bother to synchronize most readers of this at all,
 518         * because there is no reader checking a limit that actually needs
 519         * to get both rlim_cur and rlim_max atomically, and either one
 520         * alone is a single word that can safely be read normally.
 521         * getrlimit/setrlimit use task_lock(current->group_leader) to
 522         * protect this instead of the siglock, because they really
 523         * have no need to disable irqs.
 524         */
 525        struct rlimit rlim[RLIM_NLIMITS];
 526
 527        struct list_head cpu_timers[3];
 528
 529        /* keep the process-shared keyrings here so that they do the right
 530         * thing in threads created with CLONE_THREAD */
 531#ifdef CONFIG_KEYS
 532        struct key *session_keyring;    /* keyring inherited over fork */
 533        struct key *process_keyring;    /* keyring private to this process */
 534#endif
 535#ifdef CONFIG_BSD_PROCESS_ACCT
 536        struct pacct_struct pacct;      /* per-process accounting information */
 537#endif
 538#ifdef CONFIG_TASKSTATS
 539        struct taskstats *stats;
 540#endif
 541#ifdef CONFIG_AUDIT
 542        unsigned audit_tty;
 543        struct tty_audit_buf *tty_audit_buf;
 544#endif
 545};
 546
 547/* Context switch must be unlocked if interrupts are to be enabled */
 548#ifdef __ARCH_WANT_INTERRUPTS_ON_CTXSW
 549# define __ARCH_WANT_UNLOCKED_CTXSW
 550#endif
 551
 552/*
 553 * Bits in flags field of signal_struct.
 554 */
 555#define SIGNAL_STOP_STOPPED     0x00000001 /* job control stop in effect */
 556#define SIGNAL_STOP_DEQUEUED    0x00000002 /* stop signal dequeued */
 557#define SIGNAL_STOP_CONTINUED   0x00000004 /* SIGCONT since WCONTINUED reap */
 558#define SIGNAL_GROUP_EXIT       0x00000008 /* group exit in progress */
 559/*
 560 * Pending notifications to parent.
 561 */
 562#define SIGNAL_CLD_STOPPED      0x00000010
 563#define SIGNAL_CLD_CONTINUED    0x00000020
 564#define SIGNAL_CLD_MASK         (SIGNAL_CLD_STOPPED|SIGNAL_CLD_CONTINUED)
 565
 566#define SIGNAL_UNKILLABLE       0x00000040 /* for init: ignore fatal signals */
 567
 568/* If true, all threads except ->group_exit_task have pending SIGKILL */
 569static inline int signal_group_exit(const struct signal_struct *sig)
 570{
 571        return  (sig->flags & SIGNAL_GROUP_EXIT) ||
 572                (sig->group_exit_task != NULL);
 573}
 574
 575/*
 576 * Some day this will be a full-fledged user tracking system..
 577 */
 578struct user_struct {
 579        atomic_t __count;       /* reference count */
 580        atomic_t processes;     /* How many processes does this user have? */
 581        atomic_t files;         /* How many open files does this user have? */
 582        atomic_t sigpending;    /* How many pending signals does this user have? */
 583#ifdef CONFIG_INOTIFY_USER
 584        atomic_t inotify_watches; /* How many inotify watches does this user have? */
 585        atomic_t inotify_devs;  /* How many inotify devs does this user have opened? */
 586#endif
 587#ifdef CONFIG_POSIX_MQUEUE
 588        /* protected by mq_lock */
 589        unsigned long mq_bytes; /* How many bytes can be allocated to mqueue? */
 590#endif
 591        unsigned long locked_shm; /* How many pages of mlocked shm ? */
 592
 593#ifdef CONFIG_KEYS
 594        struct key *uid_keyring;        /* UID specific keyring */
 595        struct key *session_keyring;    /* UID's default session keyring */
 596#endif
 597
 598        /* Hash table maintenance information */
 599        struct hlist_node uidhash_node;
 600        uid_t uid;
 601
 602#ifdef CONFIG_USER_SCHED
 603        struct task_group *tg;
 604#ifdef CONFIG_SYSFS
 605        struct kobject kobj;
 606        struct work_struct work;
 607#endif
 608#endif
 609};
 610
 611extern int uids_sysfs_init(void);
 612
 613extern struct user_struct *find_user(uid_t);
 614
 615extern struct user_struct root_user;
 616#define INIT_USER (&root_user)
 617
 618struct backing_dev_info;
 619struct reclaim_state;
 620
 621#if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
 622struct sched_info {
 623        /* cumulative counters */
 624        unsigned long pcount;         /* # of times run on this cpu */
 625        unsigned long long cpu_time,  /* time spent on the cpu */
 626                           run_delay; /* time spent waiting on a runqueue */
 627
 628        /* timestamps */
 629        unsigned long long last_arrival,/* when we last ran on a cpu */
 630                           last_queued; /* when we were last queued to run */
 631#ifdef CONFIG_SCHEDSTATS
 632        /* BKL stats */
 633        unsigned int bkl_count;
 634#endif
 635};
 636#endif /* defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) */
 637
 638#ifdef CONFIG_SCHEDSTATS
 639extern const struct file_operations proc_schedstat_operations;
 640#endif /* CONFIG_SCHEDSTATS */
 641
 642#ifdef CONFIG_TASK_DELAY_ACCT
 643struct task_delay_info {
 644        spinlock_t      lock;
 645        unsigned int    flags;  /* Private per-task flags */
 646
 647        /* For each stat XXX, add following, aligned appropriately
 648         *
 649         * struct timespec XXX_start, XXX_end;
 650         * u64 XXX_delay;
 651         * u32 XXX_count;
 652         *
 653         * Atomicity of updates to XXX_delay, XXX_count protected by
 654         * single lock above (split into XXX_lock if contention is an issue).
 655         */
 656
 657        /*
 658         * XXX_count is incremented on every XXX operation, the delay
 659         * associated with the operation is added to XXX_delay.
 660         * XXX_delay contains the accumulated delay time in nanoseconds.
 661         */
 662        struct timespec blkio_start, blkio_end; /* Shared by blkio, swapin */
 663        u64 blkio_delay;        /* wait for sync block io completion */
 664        u64 swapin_delay;       /* wait for swapin block io completion */
 665        u32 blkio_count;        /* total count of the number of sync block */
 666                                /* io operations performed */
 667        u32 swapin_count;       /* total count of the number of swapin block */
 668                                /* io operations performed */
 669};
 670#endif  /* CONFIG_TASK_DELAY_ACCT */
 671
 672static inline int sched_info_on(void)
 673{
 674#ifdef CONFIG_SCHEDSTATS
 675        return 1;
 676#elif defined(CONFIG_TASK_DELAY_ACCT)
 677        extern int delayacct_on;
 678        return delayacct_on;
 679#else
 680        return 0;
 681#endif
 682}
 683
 684enum cpu_idle_type {
 685        CPU_IDLE,
 686        CPU_NOT_IDLE,
 687        CPU_NEWLY_IDLE,
 688        CPU_MAX_IDLE_TYPES
 689};
 690
 691/*
 692 * sched-domains (multiprocessor balancing) declarations:
 693 */
 694
 695/*
 696 * Increase resolution of nice-level calculations:
 697 */
 698#define SCHED_LOAD_SHIFT        10
 699#define SCHED_LOAD_SCALE        (1L << SCHED_LOAD_SHIFT)
 700
 701#define SCHED_LOAD_SCALE_FUZZ   SCHED_LOAD_SCALE
 702
 703#ifdef CONFIG_SMP
 704#define SD_LOAD_BALANCE         1       /* Do load balancing on this domain. */
 705#define SD_BALANCE_NEWIDLE      2       /* Balance when about to become idle */
 706#define SD_BALANCE_EXEC         4       /* Balance on exec */
 707#define SD_BALANCE_FORK         8       /* Balance on fork, clone */
 708#define SD_WAKE_IDLE            16      /* Wake to idle CPU on task wakeup */
 709#define SD_WAKE_AFFINE          32      /* Wake task to waking CPU */
 710#define SD_WAKE_BALANCE         64      /* Perform balancing at task wakeup */
 711#define SD_SHARE_CPUPOWER       128     /* Domain members share cpu power */
 712#define SD_POWERSAVINGS_BALANCE 256     /* Balance for power savings */
 713#define SD_SHARE_PKG_RESOURCES  512     /* Domain members share cpu pkg resources */
 714#define SD_SERIALIZE            1024    /* Only a single load balancing instance */
 715#define SD_WAKE_IDLE_FAR        2048    /* Gain latency sacrificing cache hit */
 716
 717#define BALANCE_FOR_MC_POWER    \
 718        (sched_smt_power_savings ? SD_POWERSAVINGS_BALANCE : 0)
 719
 720#define BALANCE_FOR_PKG_POWER   \
 721        ((sched_mc_power_savings || sched_smt_power_savings) ?  \
 722         SD_POWERSAVINGS_BALANCE : 0)
 723
 724#define test_sd_parent(sd, flag)        ((sd->parent &&         \
 725                                         (sd->parent->flags & flag)) ? 1 : 0)
 726
 727
 728struct sched_group {
 729        struct sched_group *next;       /* Must be a circular list */
 730        cpumask_t cpumask;
 731
 732        /*
 733         * CPU power of this group, SCHED_LOAD_SCALE being max power for a
 734         * single CPU. This is read only (except for setup, hotplug CPU).
 735         * Note : Never change cpu_power without recompute its reciprocal
 736         */
 737        unsigned int __cpu_power;
 738        /*
 739         * reciprocal value of cpu_power to avoid expensive divides
 740         * (see include/linux/reciprocal_div.h)
 741         */
 742        u32 reciprocal_cpu_power;
 743};
 744
 745enum sched_domain_level {
 746        SD_LV_NONE = 0,
 747        SD_LV_SIBLING,
 748        SD_LV_MC,
 749        SD_LV_CPU,
 750        SD_LV_NODE,
 751        SD_LV_ALLNODES,
 752        SD_LV_MAX
 753};
 754
 755struct sched_domain_attr {
 756        int relax_domain_level;
 757};
 758
 759#define SD_ATTR_INIT    (struct sched_domain_attr) {    \
 760        .relax_domain_level = -1,                       \
 761}
 762
 763struct sched_domain {
 764        /* These fields must be setup */
 765        struct sched_domain *parent;    /* top domain must be null terminated */
 766        struct sched_domain *child;     /* bottom domain must be null terminated */
 767        struct sched_group *groups;     /* the balancing groups of the domain */
 768        cpumask_t span;                 /* span of all CPUs in this domain */
 769        unsigned long min_interval;     /* Minimum balance interval ms */
 770        unsigned long max_interval;     /* Maximum balance interval ms */
 771        unsigned int busy_factor;       /* less balancing by factor if busy */
 772        unsigned int imbalance_pct;     /* No balance until over watermark */
 773        unsigned int cache_nice_tries;  /* Leave cache hot tasks for # tries */
 774        unsigned int busy_idx;
 775        unsigned int idle_idx;
 776        unsigned int newidle_idx;
 777        unsigned int wake_idx;
 778        unsigned int forkexec_idx;
 779        int flags;                      /* See SD_* */
 780        enum sched_domain_level level;
 781
 782        /* Runtime fields. */
 783        unsigned long last_balance;     /* init to jiffies. units in jiffies */
 784        unsigned int balance_interval;  /* initialise to 1. units in ms. */
 785        unsigned int nr_balance_failed; /* initialise to 0 */
 786
 787#ifdef CONFIG_SCHEDSTATS
 788        /* load_balance() stats */
 789        unsigned int lb_count[CPU_MAX_IDLE_TYPES];
 790        unsigned int lb_failed[CPU_MAX_IDLE_TYPES];
 791        unsigned int lb_balanced[CPU_MAX_IDLE_TYPES];
 792        unsigned int lb_imbalance[CPU_MAX_IDLE_TYPES];
 793        unsigned int lb_gained[CPU_MAX_IDLE_TYPES];
 794        unsigned int lb_hot_gained[CPU_MAX_IDLE_TYPES];
 795        unsigned int lb_nobusyg[CPU_MAX_IDLE_TYPES];
 796        unsigned int lb_nobusyq[CPU_MAX_IDLE_TYPES];
 797
 798        /* Active load balancing */
 799        unsigned int alb_count;
 800        unsigned int alb_failed;
 801        unsigned int alb_pushed;
 802
 803        /* SD_BALANCE_EXEC stats */
 804        unsigned int sbe_count;
 805        unsigned int sbe_balanced;
 806        unsigned int sbe_pushed;
 807
 808        /* SD_BALANCE_FORK stats */
 809        unsigned int sbf_count;
 810        unsigned int sbf_balanced;
 811        unsigned int sbf_pushed;
 812
 813        /* try_to_wake_up() stats */
 814        unsigned int ttwu_wake_remote;
 815        unsigned int ttwu_move_affine;
 816        unsigned int ttwu_move_balance;
 817#endif
 818};
 819
 820extern void partition_sched_domains(int ndoms_new, cpumask_t *doms_new,
 821                                    struct sched_domain_attr *dattr_new);
 822extern int arch_reinit_sched_domains(void);
 823
 824#endif  /* CONFIG_SMP */
 825
 826/*
 827 * A runqueue laden with a single nice 0 task scores a weighted_cpuload of
 828 * SCHED_LOAD_SCALE. This function returns 1 if any cpu is laden with a
 829 * task of nice 0 or enough lower priority tasks to bring up the
 830 * weighted_cpuload
 831 */
 832static inline int above_background_load(void)
 833{
 834        unsigned long cpu;
 835
 836        for_each_online_cpu(cpu) {
 837                if (weighted_cpuload(cpu) >= SCHED_LOAD_SCALE)
 838                        return 1;
 839        }
 840        return 0;
 841}
 842
 843struct io_context;                      /* See blkdev.h */
 844#define NGROUPS_SMALL           32
 845#define NGROUPS_PER_BLOCK       ((unsigned int)(PAGE_SIZE / sizeof(gid_t)))
 846struct group_info {
 847        int ngroups;
 848        atomic_t usage;
 849        gid_t small_block[NGROUPS_SMALL];
 850        int nblocks;
 851        gid_t *blocks[0];
 852};
 853
 854/*
 855 * get_group_info() must be called with the owning task locked (via task_lock())
 856 * when task != current.  The reason being that the vast majority of callers are
 857 * looking at current->group_info, which can not be changed except by the
 858 * current task.  Changing current->group_info requires the task lock, too.
 859 */
 860#define get_group_info(group_info) do { \
 861        atomic_inc(&(group_info)->usage); \
 862} while (0)
 863
 864#define put_group_info(group_info) do { \
 865        if (atomic_dec_and_test(&(group_info)->usage)) \
 866                groups_free(group_info); \
 867} while (0)
 868
 869extern struct group_info *groups_alloc(int gidsetsize);
 870extern void groups_free(struct group_info *group_info);
 871extern int set_current_groups(struct group_info *group_info);
 872extern int groups_search(struct group_info *group_info, gid_t grp);
 873/* access the groups "array" with this macro */
 874#define GROUP_AT(gi, i) \
 875    ((gi)->blocks[(i)/NGROUPS_PER_BLOCK][(i)%NGROUPS_PER_BLOCK])
 876
 877#ifdef ARCH_HAS_PREFETCH_SWITCH_STACK
 878extern void prefetch_stack(struct task_struct *t);
 879#else
 880static inline void prefetch_stack(struct task_struct *t) { }
 881#endif
 882
 883struct audit_context;           /* See audit.c */
 884struct mempolicy;
 885struct pipe_inode_info;
 886struct uts_namespace;
 887
 888struct rq;
 889struct sched_domain;
 890
 891struct sched_class {
 892        const struct sched_class *next;
 893
 894        void (*enqueue_task) (struct rq *rq, struct task_struct *p, int wakeup);
 895        void (*dequeue_task) (struct rq *rq, struct task_struct *p, int sleep);
 896        void (*yield_task) (struct rq *rq);
 897        int  (*select_task_rq)(struct task_struct *p, int sync);
 898
 899        void (*check_preempt_curr) (struct rq *rq, struct task_struct *p);
 900
 901        struct task_struct * (*pick_next_task) (struct rq *rq);
 902        void (*put_prev_task) (struct rq *rq, struct task_struct *p);
 903
 904#ifdef CONFIG_SMP
 905        unsigned long (*load_balance) (struct rq *this_rq, int this_cpu,
 906                        struct rq *busiest, unsigned long max_load_move,
 907                        struct sched_domain *sd, enum cpu_idle_type idle,
 908                        int *all_pinned, int *this_best_prio);
 909
 910        int (*move_one_task) (struct rq *this_rq, int this_cpu,
 911                              struct rq *busiest, struct sched_domain *sd,
 912                              enum cpu_idle_type idle);
 913        void (*pre_schedule) (struct rq *this_rq, struct task_struct *task);
 914        void (*post_schedule) (struct rq *this_rq);
 915        void (*task_wake_up) (struct rq *this_rq, struct task_struct *task);
 916#endif
 917
 918        void (*set_curr_task) (struct rq *rq);
 919        void (*task_tick) (struct rq *rq, struct task_struct *p, int queued);
 920        void (*task_new) (struct rq *rq, struct task_struct *p);
 921        void (*set_cpus_allowed)(struct task_struct *p,
 922                                 const cpumask_t *newmask);
 923
 924        void (*join_domain)(struct rq *rq);
 925        void (*leave_domain)(struct rq *rq);
 926
 927        void (*switched_from) (struct rq *this_rq, struct task_struct *task,
 928                               int running);
 929        void (*switched_to) (struct rq *this_rq, struct task_struct *task,
 930                             int running);
 931        void (*prio_changed) (struct rq *this_rq, struct task_struct *task,
 932                             int oldprio, int running);
 933
 934#ifdef CONFIG_FAIR_GROUP_SCHED
 935        void (*moved_group) (struct task_struct *p);
 936#endif
 937};
 938
 939struct load_weight {
 940        unsigned long weight, inv_weight;
 941};
 942
 943/*
 944 * CFS stats for a schedulable entity (task, task-group etc)
 945 *
 946 * Current field usage histogram:
 947 *
 948 *     4 se->block_start
 949 *     4 se->run_node
 950 *     4 se->sleep_start
 951 *     6 se->load.weight
 952 */
 953struct sched_entity {
 954        struct load_weight      load;           /* for load-balancing */
 955        struct rb_node          run_node;
 956        struct list_head        group_node;
 957        unsigned int            on_rq;
 958
 959        u64                     exec_start;
 960        u64                     sum_exec_runtime;
 961        u64                     vruntime;
 962        u64                     prev_sum_exec_runtime;
 963
 964        u64                     last_wakeup;
 965        u64                     avg_overlap;
 966
 967#ifdef CONFIG_SCHEDSTATS
 968        u64                     wait_start;
 969        u64                     wait_max;
 970        u64                     wait_count;
 971        u64                     wait_sum;
 972
 973        u64                     sleep_start;
 974        u64                     sleep_max;
 975        s64                     sum_sleep_runtime;
 976
 977        u64                     block_start;
 978        u64                     block_max;
 979        u64                     exec_max;
 980        u64                     slice_max;
 981
 982        u64                     nr_migrations;
 983        u64                     nr_migrations_cold;
 984        u64                     nr_failed_migrations_affine;
 985        u64                     nr_failed_migrations_running;
 986        u64                     nr_failed_migrations_hot;
 987        u64                     nr_forced_migrations;
 988        u64                     nr_forced2_migrations;
 989
 990        u64                     nr_wakeups;
 991        u64                     nr_wakeups_sync;
 992        u64                     nr_wakeups_migrate;
 993        u64                     nr_wakeups_local;
 994        u64                     nr_wakeups_remote;
 995        u64                     nr_wakeups_affine;
 996        u64                     nr_wakeups_affine_attempts;
 997        u64                     nr_wakeups_passive;
 998        u64                     nr_wakeups_idle;
 999#endif
1000
1001#ifdef CONFIG_FAIR_GROUP_SCHED
1002        struct sched_entity     *parent;
1003        /* rq on which this entity is (to be) queued: */
1004        struct cfs_rq           *cfs_rq;
1005        /* rq "owned" by this entity/group: */
1006        struct cfs_rq           *my_q;
1007#endif
1008};
1009
1010struct sched_rt_entity {
1011        struct list_head run_list;
1012        unsigned int time_slice;
1013        unsigned long timeout;
1014        int nr_cpus_allowed;
1015
1016        struct sched_rt_entity *back;
1017#ifdef CONFIG_RT_GROUP_SCHED
1018        struct sched_rt_entity  *parent;
1019        /* rq on which this entity is (to be) queued: */
1020        struct rt_rq            *rt_rq;
1021        /* rq "owned" by this entity/group: */
1022        struct rt_rq            *my_q;
1023#endif
1024};
1025
1026struct task_struct {
1027        volatile long state;    /* -1 unrunnable, 0 runnable, >0 stopped */
1028        void *stack;
1029        atomic_t usage;
1030        unsigned int flags;     /* per process flags, defined below */
1031        unsigned int ptrace;
1032
1033        int lock_depth;         /* BKL lock depth */
1034
1035#ifdef CONFIG_SMP
1036#ifdef __ARCH_WANT_UNLOCKED_CTXSW
1037        int oncpu;
1038#endif
1039#endif
1040
1041        int prio, static_prio, normal_prio;
1042        const struct sched_class *sched_class;
1043        struct sched_entity se;
1044        struct sched_rt_entity rt;
1045
1046#ifdef CONFIG_PREEMPT_NOTIFIERS
1047        /* list of struct preempt_notifier: */
1048        struct hlist_head preempt_notifiers;
1049#endif
1050
1051        /*
1052         * fpu_counter contains the number of consecutive context switches
1053         * that the FPU is used. If this is over a threshold, the lazy fpu
1054         * saving becomes unlazy to save the trap. This is an unsigned char
1055         * so that after 256 times the counter wraps and the behavior turns
1056         * lazy again; this to deal with bursty apps that only use FPU for
1057         * a short time
1058         */
1059        unsigned char fpu_counter;
1060        s8 oomkilladj; /* OOM kill score adjustment (bit shift). */
1061#ifdef CONFIG_BLK_DEV_IO_TRACE
1062        unsigned int btrace_seq;
1063#endif
1064
1065        unsigned int policy;
1066        cpumask_t cpus_allowed;
1067
1068#ifdef CONFIG_PREEMPT_RCU
1069        int rcu_read_lock_nesting;
1070        int rcu_flipctr_idx;
1071#endif /* #ifdef CONFIG_PREEMPT_RCU */
1072
1073#if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
1074        struct sched_info sched_info;
1075#endif
1076
1077        struct list_head tasks;
1078        /*
1079         * ptrace_list/ptrace_children forms the list of my children
1080         * that were stolen by a ptracer.
1081         */
1082        struct list_head ptrace_children;
1083        struct list_head ptrace_list;
1084
1085        struct mm_struct *mm, *active_mm;
1086
1087/* task state */
1088        struct linux_binfmt *binfmt;
1089        int exit_state;
1090        int exit_code, exit_signal;
1091        int pdeath_signal;  /*  The signal sent when the parent dies  */
1092        /* ??? */
1093        unsigned int personality;
1094        unsigned did_exec:1;
1095        pid_t pid;
1096        pid_t tgid;
1097
1098#ifdef CONFIG_CC_STACKPROTECTOR
1099        /* Canary value for the -fstack-protector gcc feature */
1100        unsigned long stack_canary;
1101#endif
1102        /* 
1103         * pointers to (original) parent process, youngest child, younger sibling,
1104         * older sibling, respectively.  (p->father can be replaced with 
1105         * p->parent->pid)
1106         */
1107        struct task_struct *real_parent; /* real parent process (when being debugged) */
1108        struct task_struct *parent;     /* parent process */
1109        /*
1110         * children/sibling forms the list of my children plus the
1111         * tasks I'm ptracing.
1112         */
1113        struct list_head children;      /* list of my children */
1114        struct list_head sibling;       /* linkage in my parent's children list */
1115        struct task_struct *group_leader;       /* threadgroup leader */
1116
1117        /* PID/PID hash table linkage. */
1118        struct pid_link pids[PIDTYPE_MAX];
1119        struct list_head thread_group;
1120
1121        struct completion *vfork_done;          /* for vfork() */
1122        int __user *set_child_tid;              /* CLONE_CHILD_SETTID */
1123        int __user *clear_child_tid;            /* CLONE_CHILD_CLEARTID */
1124
1125        unsigned int rt_priority;
1126        cputime_t utime, stime, utimescaled, stimescaled;
1127        cputime_t gtime;
1128        cputime_t prev_utime, prev_stime;
1129        unsigned long nvcsw, nivcsw; /* context switch counts */
1130        struct timespec start_time;             /* monotonic time */
1131        struct timespec real_start_time;        /* boot based time */
1132/* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */
1133        unsigned long min_flt, maj_flt;
1134
1135        cputime_t it_prof_expires, it_virt_expires;
1136        unsigned long long it_sched_expires;
1137        struct list_head cpu_timers[3];
1138
1139/* process credentials */
1140        uid_t uid,euid,suid,fsuid;
1141        gid_t gid,egid,sgid,fsgid;
1142        struct group_info *group_info;
1143        kernel_cap_t   cap_effective, cap_inheritable, cap_permitted, cap_bset;
1144        unsigned securebits;
1145        struct user_struct *user;
1146#ifdef CONFIG_KEYS
1147        struct key *request_key_auth;   /* assumed request_key authority */
1148        struct key *thread_keyring;     /* keyring private to this thread */
1149        unsigned char jit_keyring;      /* default keyring to attach requested keys to */
1150#endif
1151        char comm[TASK_COMM_LEN]; /* executable name excluding path
1152                                     - access with [gs]et_task_comm (which lock
1153                                       it with task_lock())
1154                                     - initialized normally by flush_old_exec */
1155/* file system info */
1156        int link_count, total_link_count;
1157#ifdef CONFIG_SYSVIPC
1158/* ipc stuff */
1159        struct sysv_sem sysvsem;
1160#endif
1161#ifdef CONFIG_DETECT_SOFTLOCKUP
1162/* hung task detection */
1163        unsigned long last_switch_timestamp;
1164        unsigned long last_switch_count;
1165#endif
1166/* CPU-specific state of this task */
1167        struct thread_struct thread;
1168/* filesystem information */
1169        struct fs_struct *fs;
1170/* open file information */
1171        struct files_struct *files;
1172/* namespaces */
1173        struct nsproxy *nsproxy;
1174/* signal handlers */
1175        struct signal_struct *signal;
1176        struct sighand_struct *sighand;
1177
1178        sigset_t blocked, real_blocked;
1179        sigset_t saved_sigmask; /* restored if set_restore_sigmask() was used */
1180        struct sigpending pending;
1181
1182        unsigned long sas_ss_sp;
1183        size_t sas_ss_size;
1184        int (*notifier)(void *priv);
1185        void *notifier_data;
1186        sigset_t *notifier_mask;
1187#ifdef CONFIG_SECURITY
1188        void *security;
1189#endif
1190        struct audit_context *audit_context;
1191#ifdef CONFIG_AUDITSYSCALL
1192        uid_t loginuid;
1193        unsigned int sessionid;
1194#endif
1195        seccomp_t seccomp;
1196
1197/* Thread group tracking */
1198        u32 parent_exec_id;
1199        u32 self_exec_id;
1200/* Protection of (de-)allocation: mm, files, fs, tty, keyrings */
1201        spinlock_t alloc_lock;
1202
1203        /* Protection of the PI data structures: */
1204        spinlock_t pi_lock;
1205
1206#ifdef CONFIG_RT_MUTEXES
1207        /* PI waiters blocked on a rt_mutex held by this task */
1208        struct plist_head pi_waiters;
1209        /* Deadlock detection and priority inheritance handling */
1210        struct rt_mutex_waiter *pi_blocked_on;
1211#endif
1212
1213#ifdef CONFIG_DEBUG_MUTEXES
1214        /* mutex deadlock detection */
1215        struct mutex_waiter *blocked_on;
1216#endif
1217#ifdef CONFIG_TRACE_IRQFLAGS
1218        unsigned int irq_events;
1219        int hardirqs_enabled;
1220        unsigned long hardirq_enable_ip;
1221        unsigned int hardirq_enable_event;
1222        unsigned long hardirq_disable_ip;
1223        unsigned int hardirq_disable_event;
1224        int softirqs_enabled;
1225        unsigned long softirq_disable_ip;
1226        unsigned int softirq_disable_event;
1227        unsigned long softirq_enable_ip;
1228        unsigned int softirq_enable_event;
1229        int hardirq_context;
1230        int softirq_context;
1231#endif
1232#ifdef CONFIG_LOCKDEP
1233# define MAX_LOCK_DEPTH 48UL
1234        u64 curr_chain_key;
1235        int lockdep_depth;
1236        struct held_lock held_locks[MAX_LOCK_DEPTH];
1237        unsigned int lockdep_recursion;
1238#endif
1239
1240/* journalling filesystem info */
1241        void *journal_info;
1242
1243/* stacked block device info */
1244        struct bio *bio_list, **bio_tail;
1245
1246/* VM state */
1247        struct reclaim_state *reclaim_state;
1248
1249        struct backing_dev_info *backing_dev_info;
1250
1251        struct io_context *io_context;
1252
1253        unsigned long ptrace_message;
1254        siginfo_t *last_siginfo; /* For ptrace use.  */
1255#ifdef CONFIG_TASK_XACCT
1256/* i/o counters(bytes read/written, #syscalls */
1257        u64 rchar, wchar, syscr, syscw;
1258#endif
1259        struct task_io_accounting ioac;
1260#if defined(CONFIG_TASK_XACCT)
1261        u64 acct_rss_mem1;      /* accumulated rss usage */
1262        u64 acct_vm_mem1;       /* accumulated virtual memory usage */
1263        cputime_t acct_stimexpd;/* stime since last update */
1264#endif
1265#ifdef CONFIG_NUMA
1266        struct mempolicy *mempolicy;
1267        short il_next;
1268#endif
1269#ifdef CONFIG_CPUSETS
1270        nodemask_t mems_allowed;
1271        int cpuset_mems_generation;
1272        int cpuset_mem_spread_rotor;
1273#endif
1274#ifdef CONFIG_CGROUPS
1275        /* Control Group info protected by css_set_lock */
1276        struct css_set *cgroups;
1277        /* cg_list protected by css_set_lock and tsk->alloc_lock */
1278        struct list_head cg_list;
1279#endif
1280#ifdef CONFIG_FUTEX
1281        struct robust_list_head __user *robust_list;
1282#ifdef CONFIG_COMPAT
1283        struct compat_robust_list_head __user *compat_robust_list;
1284#endif
1285        struct list_head pi_state_list;
1286        struct futex_pi_state *pi_state_cache;
1287#endif
1288        atomic_t fs_excl;       /* holding fs exclusive resources */
1289        struct rcu_head rcu;
1290
1291        /*
1292         * cache last used pipe for splice
1293         */
1294        struct pipe_inode_info *splice_pipe;
1295#ifdef  CONFIG_TASK_DELAY_ACCT
1296        struct task_delay_info *delays;
1297#endif
1298#ifdef CONFIG_FAULT_INJECTION
1299        int make_it_fail;
1300#endif
1301        struct prop_local_single dirties;
1302#ifdef CONFIG_LATENCYTOP
1303        int latency_record_count;
1304        struct latency_record latency_record[LT_SAVECOUNT];
1305#endif
1306};
1307
1308/*
1309 * Priority of a process goes from 0..MAX_PRIO-1, valid RT
1310 * priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL/SCHED_BATCH
1311 * tasks are in the range MAX_RT_PRIO..MAX_PRIO-1. Priority
1312 * values are inverted: lower p->prio value means higher priority.
1313 *
1314 * The MAX_USER_RT_PRIO value allows the actual maximum
1315 * RT priority to be separate from the value exported to
1316 * user-space.  This allows kernel threads to set their
1317 * priority to a value higher than any user task. Note:
1318 * MAX_RT_PRIO must not be smaller than MAX_USER_RT_PRIO.
1319 */
1320
1321#define MAX_USER_RT_PRIO        100
1322#define MAX_RT_PRIO             MAX_USER_RT_PRIO
1323
1324#define MAX_PRIO                (MAX_RT_PRIO + 40)
1325#define DEFAULT_PRIO            (MAX_RT_PRIO + 20)
1326
1327static inline int rt_prio(int prio)
1328{
1329        if (unlikely(prio < MAX_RT_PRIO))
1330                return 1;
1331        return 0;
1332}
1333
1334static inline int rt_task(struct task_struct *p)
1335{
1336        return rt_prio(p->prio);
1337}
1338
1339static inline void set_task_session(struct task_struct *tsk, pid_t session)
1340{
1341        tsk->signal->__session = session;
1342}
1343
1344static inline void set_task_pgrp(struct task_struct *tsk, pid_t pgrp)
1345{
1346        tsk->signal->__pgrp = pgrp;
1347}
1348
1349static inline struct pid *task_pid(struct task_struct *task)
1350{
1351        return task->pids[PIDTYPE_PID].pid;
1352}
1353
1354static inline struct pid *task_tgid(struct task_struct *task)
1355{
1356        return task->group_leader->pids[PIDTYPE_PID].pid;
1357}
1358
1359static inline struct pid *task_pgrp(struct task_struct *task)
1360{
1361        return task->group_leader->pids[PIDTYPE_PGID].pid;
1362}
1363
1364static inline struct pid *task_session(struct task_struct *task)
1365{
1366        return task->group_leader->pids[PIDTYPE_SID].pid;
1367}
1368
1369struct pid_namespace;
1370
1371/*
1372 * the helpers to get the task's different pids as they are seen
1373 * from various namespaces
1374 *
1375 * task_xid_nr()     : global id, i.e. the id seen from the init namespace;
1376 * task_xid_vnr()    : virtual id, i.e. the id seen from the pid namespace of
1377 *                     current.
1378 * task_xid_nr_ns()  : id seen from the ns specified;
1379 *
1380 * set_task_vxid()   : assigns a virtual id to a task;
1381 *
1382 * see also pid_nr() etc in include/linux/pid.h
1383 */
1384
1385static inline pid_t task_pid_nr(struct task_struct *tsk)
1386{
1387        return tsk->pid;
1388}
1389
1390pid_t task_pid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);
1391
1392static inline pid_t task_pid_vnr(struct task_struct *tsk)
1393{
1394        return pid_vnr(task_pid(tsk));
1395}
1396
1397
1398static inline pid_t task_tgid_nr(struct task_struct *tsk)
1399{
1400        return tsk->tgid;
1401}
1402
1403pid_t task_tgid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);
1404
1405static inline pid_t task_tgid_vnr(struct task_struct *tsk)
1406{
1407        return pid_vnr(task_tgid(tsk));
1408}
1409
1410
1411static inline pid_t task_pgrp_nr(struct task_struct *tsk)
1412{
1413        return tsk->signal->__pgrp;
1414}
1415
1416pid_t task_pgrp_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);
1417
1418static inline pid_t task_pgrp_vnr(struct task_struct *tsk)
1419{
1420        return pid_vnr(task_pgrp(tsk));
1421}
1422
1423
1424static inline pid_t task_session_nr(struct task_struct *tsk)
1425{
1426        return tsk->signal->__session;
1427}
1428
1429pid_t task_session_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);
1430
1431static inline pid_t task_session_vnr(struct task_struct *tsk)
1432{
1433        return pid_vnr(task_session(tsk));
1434}
1435
1436
1437/**
1438 * pid_alive - check that a task structure is not stale
1439 * @p: Task structure to be checked.
1440 *
1441 * Test if a process is not yet dead (at most zombie state)
1442 * If pid_alive fails, then pointers within the task structure
1443 * can be stale and must not be dereferenced.
1444 */
1445static inline int pid_alive(struct task_struct *p)
1446{
1447        return p->pids[PIDTYPE_PID].pid != NULL;
1448}
1449
1450/**
1451 * is_global_init - check if a task structure is init
1452 * @tsk: Task structure to be checked.
1453 *
1454 * Check if a task structure is the first user space task the kernel created.
1455 */
1456static inline int is_global_init(struct task_struct *tsk)
1457{
1458        return tsk->pid == 1;
1459}
1460
1461/*
1462 * is_container_init:
1463 * check whether in the task is init in its own pid namespace.
1464 */
1465extern int is_container_init(struct task_struct *tsk);
1466
1467extern struct pid *cad_pid;
1468
1469extern void free_task(struct task_struct *tsk);
1470#define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0)
1471
1472extern void __put_task_struct(struct task_struct *t);
1473
1474static inline void put_task_struct(struct task_struct *t)
1475{
1476        if (atomic_dec_and_test(&t->usage))
1477                __put_task_struct(t);
1478}
1479
1480/*
1481 * Per process flags
1482 */
1483#define PF_ALIGNWARN    0x00000001      /* Print alignment warning msgs */
1484                                        /* Not implemented yet, only for 486*/
1485#define PF_STARTING     0x00000002      /* being created */
1486#define PF_EXITING      0x00000004      /* getting shut down */
1487#define PF_EXITPIDONE   0x00000008      /* pi exit done on shut down */
1488#define PF_VCPU         0x00000010      /* I'm a virtual CPU */
1489#define PF_FORKNOEXEC   0x00000040      /* forked but didn't exec */
1490#define PF_SUPERPRIV    0x00000100      /* used super-user privileges */
1491#define PF_DUMPCORE     0x00000200      /* dumped core */
1492#define PF_SIGNALED     0x00000400      /* killed by a signal */
1493#define PF_MEMALLOC     0x00000800      /* Allocating memory */
1494#define PF_FLUSHER      0x00001000      /* responsible for disk writeback */
1495#define PF_USED_MATH    0x00002000      /* if unset the fpu must be initialized before use */
1496#define PF_NOFREEZE     0x00008000      /* this thread should not be frozen */
1497#define PF_FROZEN       0x00010000      /* frozen for system suspend */
1498#define PF_FSTRANS      0x00020000      /* inside a filesystem transaction */
1499#define PF_KSWAPD       0x00040000      /* I am kswapd */
1500#define PF_SWAPOFF      0x00080000      /* I am in swapoff */
1501#define PF_LESS_THROTTLE 0x00100000     /* Throttle me less: I clean memory */
1502#define PF_BORROWED_MM  0x00200000      /* I am a kthread doing use_mm */
1503#define PF_RANDOMIZE    0x00400000      /* randomize virtual address space */
1504#define PF_SWAPWRITE    0x00800000      /* Allowed to write to swap */
1505#define PF_SPREAD_PAGE  0x01000000      /* Spread page cache over cpuset */
1506#define PF_SPREAD_SLAB  0x02000000      /* Spread some slab caches over cpuset */
1507#define PF_MEMPOLICY    0x10000000      /* Non-default NUMA mempolicy */
1508#define PF_MUTEX_TESTER 0x20000000      /* Thread belongs to the rt mutex tester */
1509#define PF_FREEZER_SKIP 0x40000000      /* Freezer should not count it as freezeable */
1510
1511/*
1512 * Only the _current_ task can read/write to tsk->flags, but other
1513 * tasks can access tsk->flags in readonly mode for example
1514 * with tsk_used_math (like during threaded core dumping).
1515 * There is however an exception to this rule during ptrace
1516 * or during fork: the ptracer task is allowed to write to the
1517 * child->flags of its traced child (same goes for fork, the parent
1518 * can write to the child->flags), because we're guaranteed the
1519 * child is not running and in turn not changing child->flags
1520 * at the same time the parent does it.
1521 */
1522#define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0)
1523#define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0)
1524#define clear_used_math() clear_stopped_child_used_math(current)
1525#define set_used_math() set_stopped_child_used_math(current)
1526#define conditional_stopped_child_used_math(condition, child) \
1527        do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0)
1528#define conditional_used_math(condition) \
1529        conditional_stopped_child_used_math(condition, current)
1530#define copy_to_stopped_child_used_math(child) \
1531        do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0)
1532/* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */
1533#define tsk_used_math(p) ((p)->flags & PF_USED_MATH)
1534#define used_math() tsk_used_math(current)
1535
1536#ifdef CONFIG_SMP
1537extern int set_cpus_allowed_ptr(struct task_struct *p,
1538                                const cpumask_t *new_mask);
1539#else
1540static inline int set_cpus_allowed_ptr(struct task_struct *p,
1541                                       const cpumask_t *new_mask)
1542{
1543        if (!cpu_isset(0, *new_mask))
1544                return -EINVAL;
1545        return 0;
1546}
1547#endif
1548static inline int set_cpus_allowed(struct task_struct *p, cpumask_t new_mask)
1549{
1550        return set_cpus_allowed_ptr(p, &new_mask);
1551}
1552
1553extern unsigned long long sched_clock(void);
1554
1555#ifndef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK
1556static inline void sched_clock_init(void)
1557{
1558}
1559
1560static inline u64 sched_clock_cpu(int cpu)
1561{
1562        return sched_clock();
1563}
1564
1565static inline void sched_clock_tick(void)
1566{
1567}
1568
1569static inline void sched_clock_idle_sleep_event(void)
1570{
1571}
1572
1573static inline void sched_clock_idle_wakeup_event(u64 delta_ns)
1574{
1575}
1576#else
1577extern void sched_clock_init(void);
1578extern u64 sched_clock_cpu(int cpu);
1579extern void sched_clock_tick(void);
1580extern void sched_clock_idle_sleep_event(void);
1581extern void sched_clock_idle_wakeup_event(u64 delta_ns);
1582#endif
1583
1584/*
1585 * For kernel-internal use: high-speed (but slightly incorrect) per-cpu
1586 * clock constructed from sched_clock():
1587 */
1588extern unsigned long long cpu_clock(int cpu);
1589
1590extern unsigned long long
1591task_sched_runtime(struct task_struct *task);
1592
1593/* sched_exec is called by processes performing an exec */
1594#ifdef CONFIG_SMP
1595extern void sched_exec(void);
1596#else
1597#define sched_exec()   {}
1598#endif
1599
1600extern void sched_clock_idle_sleep_event(void);
1601extern void sched_clock_idle_wakeup_event(u64 delta_ns);
1602
1603#ifdef CONFIG_HOTPLUG_CPU
1604extern void idle_task_exit(void);
1605#else
1606static inline void idle_task_exit(void) {}
1607#endif
1608
1609extern void sched_idle_next(void);
1610
1611#if defined(CONFIG_NO_HZ) && defined(CONFIG_SMP)
1612extern void wake_up_idle_cpu(int cpu);
1613#else
1614static inline void wake_up_idle_cpu(int cpu) { }
1615#endif
1616
1617#ifdef CONFIG_SCHED_DEBUG
1618extern unsigned int sysctl_sched_latency;
1619extern unsigned int sysctl_sched_min_granularity;
1620extern unsigned int sysctl_sched_wakeup_granularity;
1621extern unsigned int sysctl_sched_child_runs_first;
1622extern unsigned int sysctl_sched_features;
1623extern unsigned int sysctl_sched_migration_cost;
1624extern unsigned int sysctl_sched_nr_migrate;
1625
1626int sched_nr_latency_handler(struct ctl_table *table, int write,
1627                struct file *file, void __user *buffer, size_t *length,
1628                loff_t *ppos);
1629#endif
1630extern unsigned int sysctl_sched_rt_period;
1631extern int sysctl_sched_rt_runtime;
1632
1633int sched_rt_handler(struct ctl_table *table, int write,
1634                struct file *filp, void __user *buffer, size_t *lenp,
1635                loff_t *ppos);
1636
1637extern unsigned int sysctl_sched_compat_yield;
1638
1639#ifdef CONFIG_RT_MUTEXES
1640extern int rt_mutex_getprio(struct task_struct *p);
1641extern void rt_mutex_setprio(struct task_struct *p, int prio);
1642extern void rt_mutex_adjust_pi(struct task_struct *p);
1643#else
1644static inline int rt_mutex_getprio(struct task_struct *p)
1645{
1646        return p->normal_prio;
1647}
1648# define rt_mutex_adjust_pi(p)          do { } while (0)
1649#endif
1650
1651extern void set_user_nice(struct task_struct *p, long nice);
1652extern int task_prio(const struct task_struct *p);
1653extern int task_nice(const struct task_struct *p);
1654extern int can_nice(const struct task_struct *p, const int nice);
1655extern int task_curr(const struct task_struct *p);
1656extern int idle_cpu(int cpu);
1657extern int sched_setscheduler(struct task_struct *, int, struct sched_param *);
1658extern struct task_struct *idle_task(int cpu);
1659extern struct task_struct *curr_task(int cpu);
1660extern void set_curr_task(int cpu, struct task_struct *p);
1661
1662void yield(void);
1663
1664/*
1665 * The default (Linux) execution domain.
1666 */
1667extern struct exec_domain       default_exec_domain;
1668
1669union thread_union {
1670        struct thread_info thread_info;
1671        unsigned long stack[THREAD_SIZE/sizeof(long)];
1672};
1673
1674#ifndef __HAVE_ARCH_KSTACK_END
1675static inline int kstack_end(void *addr)
1676{
1677        /* Reliable end of stack detection:
1678         * Some APM bios versions misalign the stack
1679         */
1680        return !(((unsigned long)addr+sizeof(void*)-1) & (THREAD_SIZE-sizeof(void*)));
1681}
1682#endif
1683
1684extern union thread_union init_thread_union;
1685extern struct task_struct init_task;
1686
1687extern struct   mm_struct init_mm;
1688
1689extern struct pid_namespace init_pid_ns;
1690
1691/*
1692 * find a task by one of its numerical ids
1693 *
1694 * find_task_by_pid_type_ns():
1695 *      it is the most generic call - it finds a task by all id,
1696 *      type and namespace specified
1697 * find_task_by_pid_ns():
1698 *      finds a task by its pid in the specified namespace
1699 * find_task_by_vpid():
1700 *      finds a task by its virtual pid
1701 * find_task_by_pid():
1702 *      finds a task by its global pid
1703 *
1704 * see also find_pid() etc in include/linux/pid.h
1705 */
1706
1707extern struct task_struct *find_task_by_pid_type_ns(int type, int pid,
1708                struct pid_namespace *ns);
1709
1710static inline struct task_struct *__deprecated find_task_by_pid(pid_t nr)
1711{
1712        return find_task_by_pid_type_ns(PIDTYPE_PID, nr, &init_pid_ns);
1713}
1714extern struct task_struct *find_task_by_vpid(pid_t nr);
1715extern struct task_struct *find_task_by_pid_ns(pid_t nr,
1716                struct pid_namespace *ns);
1717
1718extern void __set_special_pids(struct pid *pid);
1719
1720/* per-UID process charging. */
1721extern struct user_struct * alloc_uid(struct user_namespace *, uid_t);
1722static inline struct user_struct *get_uid(struct user_struct *u)
1723{
1724        atomic_inc(&u->__count);
1725        return u;
1726}
1727extern void free_uid(struct user_struct *);
1728extern void switch_uid(struct user_struct *);
1729extern void release_uids(struct user_namespace *ns);
1730
1731#include <asm/current.h>
1732
1733extern void do_timer(unsigned long ticks);
1734
1735extern int wake_up_state(struct task_struct *tsk, unsigned int state);
1736extern int wake_up_process(struct task_struct *tsk);
1737extern void wake_up_new_task(struct task_struct *tsk,
1738                                unsigned long clone_flags);
1739#ifdef CONFIG_SMP
1740 extern void kick_process(struct task_struct *tsk);
1741#else
1742 static inline void kick_process(struct task_struct *tsk) { }
1743#endif
1744extern void sched_fork(struct task_struct *p, int clone_flags);
1745extern void sched_dead(struct task_struct *p);
1746
1747extern int in_group_p(gid_t);
1748extern int in_egroup_p(gid_t);
1749
1750extern void proc_caches_init(void);
1751extern void flush_signals(struct task_struct *);
1752extern void ignore_signals(struct task_struct *);
1753extern void flush_signal_handlers(struct task_struct *, int force_default);
1754extern int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info);
1755
1756static inline int dequeue_signal_lock(struct task_struct *tsk, sigset_t *mask, siginfo_t *info)
1757{
1758        unsigned long flags;
1759        int ret;
1760
1761        spin_lock_irqsave(&tsk->sighand->siglock, flags);
1762        ret = dequeue_signal(tsk, mask, info);
1763        spin_unlock_irqrestore(&tsk->sighand->siglock, flags);
1764
1765        return ret;
1766}       
1767
1768extern void block_all_signals(int (*notifier)(void *priv), void *priv,
1769                              sigset_t *mask);
1770extern void unblock_all_signals(void);
1771extern void release_task(struct task_struct * p);
1772extern int send_sig_info(int, struct siginfo *, struct task_struct *);
1773extern int force_sigsegv(int, struct task_struct *);
1774extern int force_sig_info(int, struct siginfo *, struct task_struct *);
1775extern int __kill_pgrp_info(int sig, struct siginfo *info, struct pid *pgrp);
1776extern int kill_pid_info(int sig, struct siginfo *info, struct pid *pid);
1777extern int kill_pid_info_as_uid(int, struct siginfo *, struct pid *, uid_t, uid_t, u32);
1778extern int kill_pgrp(struct pid *pid, int sig, int priv);
1779extern int kill_pid(struct pid *pid, int sig, int priv);
1780extern int kill_proc_info(int, struct siginfo *, pid_t);
1781extern void do_notify_parent(struct task_struct *, int);
1782extern void force_sig(int, struct task_struct *);
1783extern void force_sig_specific(int, struct task_struct *);
1784extern int send_sig(int, struct task_struct *, int);
1785extern void zap_other_threads(struct task_struct *p);
1786extern int kill_proc(pid_t, int, int);
1787extern struct sigqueue *sigqueue_alloc(void);
1788extern void sigqueue_free(struct sigqueue *);
1789extern int send_sigqueue(struct sigqueue *,  struct task_struct *, int group);
1790extern int do_sigaction(int, struct k_sigaction *, struct k_sigaction *);
1791extern int do_sigaltstack(const stack_t __user *, stack_t __user *, unsigned long);
1792
1793static inline int kill_cad_pid(int sig, int priv)
1794{
1795        return kill_pid(cad_pid, sig, priv);
1796}
1797
1798/* These can be the second arg to send_sig_info/send_group_sig_info.  */
1799#define SEND_SIG_NOINFO ((struct siginfo *) 0)
1800#define SEND_SIG_PRIV   ((struct siginfo *) 1)
1801#define SEND_SIG_FORCED ((struct siginfo *) 2)
1802
1803static inline int is_si_special(const struct siginfo *info)
1804{
1805        return info <= SEND_SIG_FORCED;
1806}
1807
1808/* True if we are on the alternate signal stack.  */
1809
1810static inline int on_sig_stack(unsigned long sp)
1811{
1812        return (sp - current->sas_ss_sp < current->sas_ss_size);
1813}
1814
1815static inline int sas_ss_flags(unsigned long sp)
1816{
1817        return (current->sas_ss_size == 0 ? SS_DISABLE
1818                : on_sig_stack(sp) ? SS_ONSTACK : 0);
1819}
1820
1821/*
1822 * Routines for handling mm_structs
1823 */
1824extern struct mm_struct * mm_alloc(void);
1825
1826/* mmdrop drops the mm and the page tables */
1827extern void __mmdrop(struct mm_struct *);
1828static inline void mmdrop(struct mm_struct * mm)
1829{
1830        if (unlikely(atomic_dec_and_test(&mm->mm_count)))
1831                __mmdrop(mm);
1832}
1833
1834/* mmput gets rid of the mappings and all user-space */
1835extern void mmput(struct mm_struct *);
1836/* Grab a reference to a task's mm, if it is not already going away */
1837extern struct mm_struct *get_task_mm(struct task_struct *task);
1838/* Remove the current tasks stale references to the old mm_struct */
1839extern void mm_release(struct task_struct *, struct mm_struct *);
1840/* Allocate a new mm structure and copy contents from tsk->mm */
1841extern struct mm_struct *dup_mm(struct task_struct *tsk);
1842
1843extern int  copy_thread(int, unsigned long, unsigned long, unsigned long, struct task_struct *, struct pt_regs *);
1844extern void flush_thread(void);
1845extern void exit_thread(void);
1846
1847extern void exit_files(struct task_struct *);
1848extern void __cleanup_signal(struct signal_struct *);
1849extern void __cleanup_sighand(struct sighand_struct *);
1850
1851extern void exit_itimers(struct signal_struct *);
1852extern void flush_itimer_signals(void);
1853
1854extern NORET_TYPE void do_group_exit(int);
1855
1856extern void daemonize(const char *, ...);
1857extern int allow_signal(int);
1858extern int disallow_signal(int);
1859
1860extern int do_execve(char *, char __user * __user *, char __user * __user *, struct pt_regs *);
1861extern long do_fork(unsigned long, unsigned long, struct pt_regs *, unsigned long, int __user *, int __user *);
1862struct task_struct *fork_idle(int);
1863
1864extern void set_task_comm(struct task_struct *tsk, char *from);
1865extern char *get_task_comm(char *to, struct task_struct *tsk);
1866
1867#ifdef CONFIG_SMP
1868extern void wait_task_inactive(struct task_struct * p);
1869#else
1870#define wait_task_inactive(p)   do { } while (0)
1871#endif
1872
1873#define remove_parent(p)        list_del_init(&(p)->sibling)
1874#define add_parent(p)           list_add_tail(&(p)->sibling,&(p)->parent->children)
1875
1876#define next_task(p)    list_entry(rcu_dereference((p)->tasks.next), struct task_struct, tasks)
1877
1878#define for_each_process(p) \
1879        for (p = &init_task ; (p = next_task(p)) != &init_task ; )
1880
1881/*
1882 * Careful: do_each_thread/while_each_thread is a double loop so
1883 *          'break' will not work as expected - use goto instead.
1884 */
1885#define do_each_thread(g, t) \
1886        for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do
1887
1888#define while_each_thread(g, t) \
1889        while ((t = next_thread(t)) != g)
1890
1891/* de_thread depends on thread_group_leader not being a pid based check */
1892#define thread_group_leader(p)  (p == p->group_leader)
1893
1894/* Do to the insanities of de_thread it is possible for a process
1895 * to have the pid of the thread group leader without actually being
1896 * the thread group leader.  For iteration through the pids in proc
1897 * all we care about is that we have a task with the appropriate
1898 * pid, we don't actually care if we have the right task.
1899 */
1900static inline int has_group_leader_pid(struct task_struct *p)
1901{
1902        return p->pid == p->tgid;
1903}
1904
1905static inline
1906int same_thread_group(struct task_struct *p1, struct task_struct *p2)
1907{
1908        return p1->tgid == p2->tgid;
1909}
1910
1911static inline struct task_struct *next_thread(const struct task_struct *p)
1912{
1913        return list_entry(rcu_dereference(p->thread_group.next),
1914                          struct task_struct, thread_group);
1915}
1916
1917static inline int thread_group_empty(struct task_struct *p)
1918{
1919        return list_empty(&p->thread_group);
1920}
1921
1922#define delay_group_leader(p) \
1923                (thread_group_leader(p) && !thread_group_empty(p))
1924
1925/*
1926 * Protects ->fs, ->files, ->mm, ->group_info, ->comm, keyring
1927 * subscriptions and synchronises with wait4().  Also used in procfs.  Also
1928 * pins the final release of task.io_context.  Also protects ->cpuset and
1929 * ->cgroup.subsys[].
1930 *
1931 * Nests both inside and outside of read_lock(&tasklist_lock).
1932 * It must not be nested with write_lock_irq(&tasklist_lock),
1933 * neither inside nor outside.
1934 */
1935static inline void task_lock(struct task_struct *p)
1936{
1937        spin_lock(&p->alloc_lock);
1938}
1939
1940static inline void task_unlock(struct task_struct *p)
1941{
1942        spin_unlock(&p->alloc_lock);
1943}
1944
1945extern struct sighand_struct *lock_task_sighand(struct task_struct *tsk,
1946                                                        unsigned long *flags);
1947
1948static inline void unlock_task_sighand(struct task_struct *tsk,
1949                                                unsigned long *flags)
1950{
1951        spin_unlock_irqrestore(&tsk->sighand->siglock, *flags);
1952}
1953
1954#ifndef __HAVE_THREAD_FUNCTIONS
1955
1956#define task_thread_info(task)  ((struct thread_info *)(task)->stack)
1957#define task_stack_page(task)   ((task)->stack)
1958
1959static inline void setup_thread_stack(struct task_struct *p, struct task_struct *org)
1960{
1961        *task_thread_info(p) = *task_thread_info(org);
1962        task_thread_info(p)->task = p;
1963}
1964
1965static inline unsigned long *end_of_stack(struct task_struct *p)
1966{
1967        return (unsigned long *)(task_thread_info(p) + 1);
1968}
1969
1970#endif
1971
1972extern void thread_info_cache_init(void);
1973
1974/* set thread flags in other task's structures
1975 * - see asm/thread_info.h for TIF_xxxx flags available
1976 */
1977static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag)
1978{
1979        set_ti_thread_flag(task_thread_info(tsk), flag);
1980}
1981
1982static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag)
1983{
1984        clear_ti_thread_flag(task_thread_info(tsk), flag);
1985}
1986
1987static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag)
1988{
1989        return test_and_set_ti_thread_flag(task_thread_info(tsk), flag);
1990}
1991
1992static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag)
1993{
1994        return test_and_clear_ti_thread_flag(task_thread_info(tsk), flag);
1995}
1996
1997static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag)
1998{
1999        return test_ti_thread_flag(task_thread_info(tsk), flag);
2000}
2001
2002static inline void set_tsk_need_resched(struct task_struct *tsk)
2003{
2004        set_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
2005}
2006
2007static inline void clear_tsk_need_resched(struct task_struct *tsk)
2008{
2009        clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
2010}
2011
2012static inline int test_tsk_need_resched(struct task_struct *tsk)
2013{
2014        return unlikely(test_tsk_thread_flag(tsk,TIF_NEED_RESCHED));
2015}
2016
2017static inline int signal_pending(struct task_struct *p)
2018{
2019        return unlikely(test_tsk_thread_flag(p,TIF_SIGPENDING));
2020}
2021
2022extern int __fatal_signal_pending(struct task_struct *p);
2023
2024static inline int fatal_signal_pending(struct task_struct *p)
2025{
2026        return signal_pending(p) && __fatal_signal_pending(p);
2027}
2028
2029static inline int signal_pending_state(long state, struct task_struct *p)
2030{
2031        if (!(state & (TASK_INTERRUPTIBLE | TASK_WAKEKILL)))
2032                return 0;
2033        if (!signal_pending(p))
2034                return 0;
2035
2036        if (state & (__TASK_STOPPED | __TASK_TRACED))
2037                return 0;
2038
2039        return (state & TASK_INTERRUPTIBLE) || __fatal_signal_pending(p);
2040}
2041
2042static inline int need_resched(void)
2043{
2044        return unlikely(test_thread_flag(TIF_NEED_RESCHED));
2045}
2046
2047/*
2048 * cond_resched() and cond_resched_lock(): latency reduction via
2049 * explicit rescheduling in places that are safe. The return
2050 * value indicates whether a reschedule was done in fact.
2051 * cond_resched_lock() will drop the spinlock before scheduling,
2052 * cond_resched_softirq() will enable bhs before scheduling.
2053 */
2054extern int _cond_resched(void);
2055#ifdef CONFIG_PREEMPT_BKL
2056static inline int cond_resched(void)
2057{
2058        return 0;
2059}
2060#else
2061static inline int cond_resched(void)
2062{
2063        return _cond_resched();
2064}
2065#endif
2066extern int cond_resched_lock(spinlock_t * lock);
2067extern int cond_resched_softirq(void);
2068static inline int cond_resched_bkl(void)
2069{
2070        return _cond_resched();
2071}
2072
2073/*
2074 * Does a critical section need to be broken due to another
2075 * task waiting?: (technically does not depend on CONFIG_PREEMPT,
2076 * but a general need for low latency)
2077 */
2078static inline int spin_needbreak(spinlock_t *lock)
2079{
2080#ifdef CONFIG_PREEMPT
2081        return spin_is_contended(lock);
2082#else
2083        return 0;
2084#endif
2085}
2086
2087/*
2088 * Reevaluate whether the task has signals pending delivery.
2089 * Wake the task if so.
2090 * This is required every time the blocked sigset_t changes.
2091 * callers must hold sighand->siglock.
2092 */
2093extern void recalc_sigpending_and_wake(struct task_struct *t);
2094extern void recalc_sigpending(void);
2095
2096extern void signal_wake_up(struct task_struct *t, int resume_stopped);
2097
2098/*
2099 * Wrappers for p->thread_info->cpu access. No-op on UP.
2100 */
2101#ifdef CONFIG_SMP
2102
2103static inline unsigned int task_cpu(const struct task_struct *p)
2104{
2105        return task_thread_info(p)->cpu;
2106}
2107
2108extern void set_task_cpu(struct task_struct *p, unsigned int cpu);
2109
2110#else
2111
2112static inline unsigned int task_cpu(const struct task_struct *p)
2113{
2114        return 0;
2115}
2116
2117static inline void set_task_cpu(struct task_struct *p, unsigned int cpu)
2118{
2119}
2120
2121#endif /* CONFIG_SMP */
2122
2123#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
2124extern void arch_pick_mmap_layout(struct mm_struct *mm);
2125#else
2126static inline void arch_pick_mmap_layout(struct mm_struct *mm)
2127{
2128        mm->mmap_base = TASK_UNMAPPED_BASE;
2129        mm->get_unmapped_area = arch_get_unmapped_area;
2130        mm->unmap_area = arch_unmap_area;
2131}
2132#endif
2133
2134extern long sched_setaffinity(pid_t pid, const cpumask_t *new_mask);
2135extern long sched_getaffinity(pid_t pid, cpumask_t *mask);
2136
2137extern int sched_mc_power_savings, sched_smt_power_savings;
2138
2139extern void normalize_rt_tasks(void);
2140
2141#ifdef CONFIG_GROUP_SCHED
2142
2143extern struct task_group init_task_group;
2144#ifdef CONFIG_USER_SCHED
2145extern struct task_group root_task_group;
2146#endif
2147
2148extern struct task_group *sched_create_group(struct task_group *parent);
2149extern void sched_destroy_group(struct task_group *tg);
2150extern void sched_move_task(struct task_struct *tsk);
2151#ifdef CONFIG_FAIR_GROUP_SCHED
2152extern int sched_group_set_shares(struct task_group *tg, unsigned long shares);
2153extern unsigned long sched_group_shares(struct task_group *tg);
2154#endif
2155#ifdef CONFIG_RT_GROUP_SCHED
2156extern int sched_group_set_rt_runtime(struct task_group *tg,
2157                                      long rt_runtime_us);
2158extern long sched_group_rt_runtime(struct task_group *tg);
2159extern int sched_group_set_rt_period(struct task_group *tg,
2160                                      long rt_period_us);
2161extern long sched_group_rt_period(struct task_group *tg);
2162#endif
2163#endif
2164
2165#ifdef CONFIG_TASK_XACCT
2166static inline void add_rchar(struct task_struct *tsk, ssize_t amt)
2167{
2168        tsk->rchar += amt;
2169}
2170
2171static inline void add_wchar(struct task_struct *tsk, ssize_t amt)
2172{
2173        tsk->wchar += amt;
2174}
2175
2176static inline void inc_syscr(struct task_struct *tsk)
2177{
2178        tsk->syscr++;
2179}
2180
2181static inline void inc_syscw(struct task_struct *tsk)
2182{
2183        tsk->syscw++;
2184}
2185#else
2186static inline void add_rchar(struct task_struct *tsk, ssize_t amt)
2187{
2188}
2189
2190static inline void add_wchar(struct task_struct *tsk, ssize_t amt)
2191{
2192}
2193
2194static inline void inc_syscr(struct task_struct *tsk)
2195{
2196}
2197
2198static inline void inc_syscw(struct task_struct *tsk)
2199{
2200}
2201#endif
2202
2203#ifdef CONFIG_SMP
2204void migration_init(void);
2205#else
2206static inline void migration_init(void)
2207{
2208}
2209#endif
2210
2211#ifndef TASK_SIZE_OF
2212#define TASK_SIZE_OF(tsk)       TASK_SIZE
2213#endif
2214
2215#ifdef CONFIG_MM_OWNER
2216extern void mm_update_next_owner(struct mm_struct *mm);
2217extern void mm_init_owner(struct mm_struct *mm, struct task_struct *p);
2218#else
2219static inline void mm_update_next_owner(struct mm_struct *mm)
2220{
2221}
2222
2223static inline void mm_init_owner(struct mm_struct *mm, struct task_struct *p)
2224{
2225}
2226#endif /* CONFIG_MM_OWNER */
2227
2228#endif /* __KERNEL__ */
2229
2230#endif
2231
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