include/linux/sched.h

   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
  44 struct 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
  93 struct mem_cgroup;
  94 struct exec_domain;
  95 struct futex_pi_state;
  96 struct robust_list_head;
  97 struct 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  */
 115 extern 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
 129 extern unsigned long total_forks;
 130 extern int nr_threads;
 131 DECLARE_PER_CPU(unsigned long, process_counts);
 132 extern int nr_processes(void);
 133 extern unsigned long nr_running(void);
 134 extern unsigned long nr_uninterruptible(void);
 135 extern unsigned long nr_active(void);
 136 extern unsigned long nr_iowait(void);
 137
 138 struct seq_file;
 139 struct cfs_rq;
 140 struct task_group;
 141 #ifdef CONFIG_SCHED_DEBUG
 142 extern void proc_sched_show_task(struct task_struct *p, struct seq_file *m);
 143 extern void proc_sched_set_task(struct task_struct *p);
 144 extern void
 145 print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq);
 146 #else
 147 static inline void
 148 proc_sched_show_task(struct task_struct *p, struct seq_file *m)
 149 {
 150 }
 151 static inline void proc_sched_set_task(struct task_struct *p)
 152 {
 153 }
 154 static inline void
 155 print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)
 156 {
 157 }
 158 #endif
 159
 160 extern unsigned long long time_sync_thresh;
 161
 162 /*
 163  * Task state bitmask. NOTE! These bits are also
 164  * encoded in fs/proc/array.c: get_task_state().
 165  *
 166  * We have two separate sets of flags: task->state
 167  * is about runnability, while task->exit_state are
 168  * about the task exiting. Confusing, but this way
 169  * modifying one set can't modify the other one by
 170  * mistake.
 171  */
 172 #define TASK_RUNNING            0
 173 #define TASK_INTERRUPTIBLE      1
 174 #define TASK_UNINTERRUPTIBLE    2
 175 #define __TASK_STOPPED          4
 176 #define __TASK_TRACED           8
 177 /* in tsk->exit_state */
 178 #define EXIT_ZOMBIE             16
 179 #define EXIT_DEAD               32
 180 /* in tsk->state again */
 181 #define TASK_DEAD               64
 182 #define TASK_WAKEKILL           128
 183
 184 /* Convenience macros for the sake of set_task_state */
 185 #define TASK_KILLABLE           (TASK_WAKEKILL | TASK_UNINTERRUPTIBLE)
 186 #define TASK_STOPPED            (TASK_WAKEKILL | __TASK_STOPPED)
 187 #define TASK_TRACED             (TASK_WAKEKILL | __TASK_TRACED)
 188
 189 /* Convenience macros for the sake of wake_up */
 190 #define TASK_NORMAL             (TASK_INTERRUPTIBLE | TASK_UNINTERRUPTIBLE)
 191 #define TASK_ALL                (TASK_NORMAL | __TASK_STOPPED | __TASK_TRACED)
 192
 193 /* get_task_state() */
 194 #define TASK_REPORT             (TASK_RUNNING | TASK_INTERRUPTIBLE | \
 195                                  TASK_UNINTERRUPTIBLE | __TASK_STOPPED | \
 196                                  __TASK_TRACED)
 197
 198 #define task_is_traced(task)    ((task->state & __TASK_TRACED) != 0)
 199 #define task_is_stopped(task)   ((task->state & __TASK_STOPPED) != 0)
 200 #define task_is_stopped_or_traced(task) \
 201                         ((task->state & (__TASK_STOPPED | __TASK_TRACED)) != 0)
 202 #define task_contributes_to_load(task)  \
 203                                 ((task->state & TASK_UNINTERRUPTIBLE) != 0)
 204
 205 #define __set_task_state(tsk, state_value)              \
 206         do { (tsk)->state = (state_value); } while (0)
 207 #define set_task_state(tsk, state_value)                \
 208         set_mb((tsk)->state, (state_value))
 209
 210 /*
 211  * set_current_state() includes a barrier so that the write of current->state
 212  * is correctly serialised wrt the caller's subsequent test of whether to
 213  * actually sleep:
 214  *
 215  *      set_current_state(TASK_UNINTERRUPTIBLE);
 216  *      if (do_i_need_to_sleep())
 217  *              schedule();
 218  *
 219  * If the caller does not need such serialisation then use __set_current_state()
 220  */
 221 #define __set_current_state(state_value)                        \
 222         do { current->state = (state_value); } while (0)
 223 #define set_current_state(state_value)          \
 224         set_mb(current->state, (state_value))
 225
 226 /* Task command name length */
 227 #define TASK_COMM_LEN 16
 228
 229 #include <linux/spinlock.h>
 230
 231 /*
 232  * This serializes "schedule()" and also protects
 233  * the run-queue from deletions/modifications (but
 234  * _adding_ to the beginning of the run-queue has
 235  * a separate lock).
 236  */
 237 extern rwlock_t tasklist_lock;
 238 extern spinlock_t mmlist_lock;
 239
 240 struct task_struct;
 241
 242 extern void sched_init(void);
 243 extern void sched_init_smp(void);
 244 extern asmlinkage void schedule_tail(struct task_struct *prev);
 245 extern void init_idle(struct task_struct *idle, int cpu);
 246 extern void init_idle_bootup_task(struct task_struct *idle);
 247
 248 extern int runqueue_is_locked(void);
 249
 250 extern cpumask_t nohz_cpu_mask;
 251 #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ)
 252 extern int select_nohz_load_balancer(int cpu);
 253 #else
 254 static inline int select_nohz_load_balancer(int cpu)
 255 {
 256         return 0;
 257 }
 258 #endif
 259
 260 extern unsigned long rt_needs_cpu(int cpu);
 261
 262 /*
 263  * Only dump TASK_* tasks. (0 for all tasks)
 264  */
 265 extern void show_state_filter(unsigned long state_filter);
 266
 267 static inline void show_state(void)
 268 {
 269         show_state_filter(0);
 270 }
 271
 272 extern void show_regs(struct pt_regs *);
 273
 274 /*
 275  * TASK is a pointer to the task whose backtrace we want to see (or NULL for current
 276  * task), SP is the stack pointer of the first frame that should be shown in the back
 277  * trace (or NULL if the entire call-chain of the task should be shown).
 278  */
 279 extern void show_stack(struct task_struct *task, unsigned long *sp);
 280
 281 void io_schedule(void);
 282 long io_schedule_timeout(long timeout);
 283
 284 extern void cpu_init (void);
 285 extern void trap_init(void);
 286 extern void account_process_tick(struct task_struct *task, int user);
 287 extern void update_process_times(int user);
 288 extern void scheduler_tick(void);
 289 extern void hrtick_resched(void);
 290
 291 extern void sched_show_task(struct task_struct *p);
 292
 293 #ifdef CONFIG_DETECT_SOFTLOCKUP
 294 extern void softlockup_tick(void);
 295 extern void spawn_softlockup_task(void);
 296 extern void touch_softlockup_watchdog(void);
 297 extern void touch_all_softlockup_watchdogs(void);
 298 extern unsigned int  softlockup_panic;
 299 extern unsigned long sysctl_hung_task_check_count;
 300 extern unsigned long sysctl_hung_task_timeout_secs;
 301 extern unsigned long sysctl_hung_task_warnings;
 302 extern int softlockup_thresh;
 303 #else
 304 static inline void softlockup_tick(void)
 305 {
 306 }
 307 static inline void spawn_softlockup_task(void)
 308 {
 309 }
 310 static inline void touch_softlockup_watchdog(void)
 311 {
 312 }
 313 static inline void touch_all_softlockup_watchdogs(void)
 314 {
 315 }
 316 #endif
 317
 318
 319 /* Attach to any functions which should be ignored in wchan output. */
 320 #define __sched         __attribute__((__section__(".sched.text")))
 321
 322 /* Linker adds these: start and end of __sched functions */
 323 extern char __sched_text_start[], __sched_text_end[];
 324
 325 /* Is this address in the __sched functions? */
 326 extern int in_sched_functions(unsigned long addr);
 327
 328 #define MAX_SCHEDULE_TIMEOUT    LONG_MAX
 329 extern signed long schedule_timeout(signed long timeout);
 330 extern signed long schedule_timeout_interruptible(signed long timeout);
 331 extern signed long schedule_timeout_killable(signed long timeout);
 332 extern signed long schedule_timeout_uninterruptible(signed long timeout);
 333 asmlinkage void schedule(void);
 334
 335 struct nsproxy;
 336 struct user_namespace;
 337
 338 /* Maximum number of active map areas.. This is a random (large) number */
 339 #define DEFAULT_MAX_MAP_COUNT   65536
 340
 341 extern int sysctl_max_map_count;
 342
 343 #include <linux/aio.h>
 344
 345 extern unsigned long
 346 arch_get_unmapped_area(struct file *, unsigned long, unsigned long,
 347                        unsigned long, unsigned long);
 348 extern unsigned long
 349 arch_get_unmapped_area_topdown(struct file *filp, unsigned long addr,
 350                           unsigned long len, unsigned long pgoff,
 351                           unsigned long flags);
 352 extern void arch_unmap_area(struct mm_struct *, unsigned long);
 353 extern void arch_unmap_area_topdown(struct mm_struct *, unsigned long);
 354
 355 #if NR_CPUS >= CONFIG_SPLIT_PTLOCK_CPUS
 356 /*
 357  * The mm counters are not protected by its page_table_lock,
 358  * so must be incremented atomically.
 359  */
 360 #define set_mm_counter(mm, member, value) atomic_long_set(&(mm)->_##member, value)
 361 #define get_mm_counter(mm, member) ((unsigned long)atomic_long_read(&(mm)->_##member))
 362 #define add_mm_counter(mm, member, value) atomic_long_add(value, &(mm)->_##member)
 363 #define inc_mm_counter(mm, member) atomic_long_inc(&(mm)->_##member)
 364 #define dec_mm_counter(mm, member) atomic_long_dec(&(mm)->_##member)
 365
 366 #else  /* NR_CPUS < CONFIG_SPLIT_PTLOCK_CPUS */
 367 /*
 368  * The mm counters are protected by its page_table_lock,
 369  * so can be incremented directly.
 370  */
 371 #define set_mm_counter(mm, member, value) (mm)->_##member = (value)
 372 #define get_mm_counter(mm, member) ((mm)->_##member)
 373 #define add_mm_counter(mm, member, value) (mm)->_##member += (value)
 374 #define inc_mm_counter(mm, member) (mm)->_##member++
 375 #define dec_mm_counter(mm, member) (mm)->_##member--
 376
 377 #endif /* NR_CPUS < CONFIG_SPLIT_PTLOCK_CPUS */
 378
 379 #define get_mm_rss(mm)                                  \
 380         (get_mm_counter(mm, file_rss) + get_mm_counter(mm, anon_rss))
 381 #define update_hiwater_rss(mm)  do {                    \
 382         unsigned long _rss = get_mm_rss(mm);            \
 383         if ((mm)->hiwater_rss < _rss)                   \
 384                 (mm)->hiwater_rss = _rss;               \
 385 } while (0)
 386 #define update_hiwater_vm(mm)   do {                    \
 387         if ((mm)->hiwater_vm < (mm)->total_vm)          \
 388                 (mm)->hiwater_vm = (mm)->total_vm;      \
 389 } while (0)
 390
 391 extern void set_dumpable(struct mm_struct *mm, int value);
 392 extern int get_dumpable(struct mm_struct *mm);
 393
 394 /* mm flags */
 395 /* dumpable bits */
 396 #define MMF_DUMPABLE      0  /* core dump is permitted */
 397 #define MMF_DUMP_SECURELY 1  /* core file is readable only by root */
 398 #define MMF_DUMPABLE_BITS 2
 399
 400 /* coredump filter bits */
 401 #define MMF_DUMP_ANON_PRIVATE   2
 402 #define MMF_DUMP_ANON_SHARED    3
 403 #define MMF_DUMP_MAPPED_PRIVATE 4
 404 #define MMF_DUMP_MAPPED_SHARED  5
 405 #define MMF_DUMP_ELF_HEADERS    6
 406 #define MMF_DUMP_FILTER_SHIFT   MMF_DUMPABLE_BITS
 407 #define MMF_DUMP_FILTER_BITS    5
 408 #define MMF_DUMP_FILTER_MASK \
 409         (((1 << MMF_DUMP_FILTER_BITS) - 1) << MMF_DUMP_FILTER_SHIFT)
 410 #define MMF_DUMP_FILTER_DEFAULT \
 411         ((1 << MMF_DUMP_ANON_PRIVATE) | (1 << MMF_DUMP_ANON_SHARED))
 412
 413 struct sighand_struct {
 414         atomic_t                count;
 415         struct k_sigaction      action[_NSIG];
 416         spinlock_t              siglock;
 417         wait_queue_head_t       signalfd_wqh;
 418 };
 419
 420 struct pacct_struct {
 421         int                     ac_flag;
 422         long                    ac_exitcode;
 423         unsigned long           ac_mem;
 424         cputime_t               ac_utime, ac_stime;
 425         unsigned long           ac_minflt, ac_majflt;
 426 };
 427
 428 /*
 429  * NOTE! "signal_struct" does not have it's own
 430  * locking, because a shared signal_struct always
 431  * implies a shared sighand_struct, so locking
 432  * sighand_struct is always a proper superset of
 433  * the locking of signal_struct.
 434  */
 435 struct signal_struct {
 436         atomic_t                count;
 437         atomic_t                live;
 438
 439         wait_queue_head_t       wait_chldexit;  /* for wait4() */
 440
 441         /* current thread group signal load-balancing target: */
 442         struct task_struct      *curr_target;
 443
 444         /* shared signal handling: */
 445         struct sigpending       shared_pending;
 446
 447         /* thread group exit support */
 448         int                     group_exit_code;
 449         /* overloaded:
 450          * - notify group_exit_task when ->count is equal to notify_count
 451          * - everyone except group_exit_task is stopped during signal delivery
 452          *   of fatal signals, group_exit_task processes the signal.
 453          */
 454         struct task_struct      *group_exit_task;
 455         int                     notify_count;
 456
 457         /* thread group stop support, overloads group_exit_code too */
 458         int                     group_stop_count;
 459         unsigned int            flags; /* see SIGNAL_* flags below */
 460
 461         /* POSIX.1b Interval Timers */
 462         struct list_head posix_timers;
 463
 464         /* ITIMER_REAL timer for the process */
 465         struct hrtimer real_timer;
 466         struct pid *leader_pid;
 467         ktime_t it_real_incr;
 468
 469         /* ITIMER_PROF and ITIMER_VIRTUAL timers for the process */
 470         cputime_t it_prof_expires, it_virt_expires;
 471         cputime_t it_prof_incr, it_virt_incr;
 472
 473         /* job control IDs */
 474
 475         /*
 476          * pgrp and session fields are deprecated.
 477          * use the task_session_Xnr and task_pgrp_Xnr routines below
 478          */
 479
 480         union {
 481                 pid_t pgrp __deprecated;
 482                 pid_t __pgrp;
 483         };
 484
 485         struct pid *tty_old_pgrp;
 486
 487         union {
 488                 pid_t session __deprecated;
 489                 pid_t __session;
 490         };
 491
 492         /* boolean value for session group leader */
 493         int leader;
 494
 495         struct tty_struct *tty; /* NULL if no tty */
 496
 497         /*
 498          * Cumulative resource counters for dead threads in the group,
 499          * and for reaped dead child processes forked by this group.
 500          * Live threads maintain their own counters and add to these
 501          * in __exit_signal, except for the group leader.
 502          */
 503         cputime_t utime, stime, cutime, cstime;
 504         cputime_t gtime;
 505         cputime_t cgtime;
 506         unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw;
 507         unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt;
 508         unsigned long inblock, oublock, cinblock, coublock;
 509 #ifdef CONFIG_TASK_XACCT
 510         u64 rchar, wchar, syscr, syscw;
 511 #endif
 512         struct task_io_accounting ioac;
 513
 514         /*
 515          * Cumulative ns of scheduled CPU time for dead threads in the
 516          * group, not including a zombie group leader.  (This only differs
 517          * from jiffies_to_ns(utime + stime) if sched_clock uses something
 518          * other than jiffies.)
 519          */
 520         unsigned long long sum_sched_runtime;
 521
 522         /*
 523          * We don't bother to synchronize most readers of this at all,
 524          * because there is no reader checking a limit that actually needs
 525          * to get both rlim_cur and rlim_max atomically, and either one
 526          * alone is a single word that can safely be read normally.
 527          * getrlimit/setrlimit use task_lock(current->group_leader) to
 528          * protect this instead of the siglock, because they really
 529          * have no need to disable irqs.
 530          */
 531         struct rlimit rlim[RLIM_NLIMITS];
 532
 533         struct list_head cpu_timers[3];
 534
 535         /* keep the process-shared keyrings here so that they do the right
 536          * thing in threads created with CLONE_THREAD */
 537 #ifdef CONFIG_KEYS
 538         struct key *session_keyring;    /* keyring inherited over fork */
 539         struct key *process_keyring;    /* keyring private to this process */
 540 #endif
 541 #ifdef CONFIG_BSD_PROCESS_ACCT
 542         struct pacct_struct pacct;      /* per-process accounting information */
 543 #endif
 544 #ifdef CONFIG_TASKSTATS
 545         struct taskstats *stats;
 546 #endif
 547 #ifdef CONFIG_AUDIT
 548         unsigned audit_tty;
 549         struct tty_audit_buf *tty_audit_buf;
 550 #endif
 551 };
 552
 553 /* Context switch must be unlocked if interrupts are to be enabled */
 554 #ifdef __ARCH_WANT_INTERRUPTS_ON_CTXSW
 555 # define __ARCH_WANT_UNLOCKED_CTXSW
 556 #endif
 557
 558 /*
 559  * Bits in flags field of signal_struct.
 560  */
 561 #define SIGNAL_STOP_STOPPED     0x00000001 /* job control stop in effect */
 562 #define SIGNAL_STOP_DEQUEUED    0x00000002 /* stop signal dequeued */
 563 #define SIGNAL_STOP_CONTINUED   0x00000004 /* SIGCONT since WCONTINUED reap */
 564 #define SIGNAL_GROUP_EXIT       0x00000008 /* group exit in progress */
 565 /*
 566  * Pending notifications to parent.
 567  */
 568 #define SIGNAL_CLD_STOPPED      0x00000010
 569 #define SIGNAL_CLD_CONTINUED    0x00000020
 570 #define SIGNAL_CLD_MASK         (SIGNAL_CLD_STOPPED|SIGNAL_CLD_CONTINUED)
 571
 572 #define SIGNAL_UNKILLABLE       0x00000040 /* for init: ignore fatal signals */
 573
 574 /* If true, all threads except ->group_exit_task have pending SIGKILL */
 575 static inline int signal_group_exit(const struct signal_struct *sig)
 576 {
 577         return  (sig->flags & SIGNAL_GROUP_EXIT) ||
 578                 (sig->group_exit_task != NULL);
 579 }
 580
 581 /*
 582  * Some day this will be a full-fledged user tracking system..
 583  */
 584 struct user_struct {
 585         atomic_t __count;       /* reference count */
 586         atomic_t processes;     /* How many processes does this user have? */
 587         atomic_t files;         /* How many open files does this user have? */
 588         atomic_t sigpending;    /* How many pending signals does this user have? */
 589 #ifdef CONFIG_INOTIFY_USER
 590         atomic_t inotify_watches; /* How many inotify watches does this user have? */
 591         atomic_t inotify_devs;  /* How many inotify devs does this user have opened? */
 592 #endif
 593 #ifdef CONFIG_POSIX_MQUEUE
 594         /* protected by mq_lock */
 595         unsigned long mq_bytes; /* How many bytes can be allocated to mqueue? */
 596 #endif
 597         unsigned long locked_shm; /* How many pages of mlocked shm ? */
 598
 599 #ifdef CONFIG_KEYS
 600         struct key *uid_keyring;        /* UID specific keyring */
 601         struct key *session_keyring;    /* UID's default session keyring */
 602 #endif
 603
 604         /* Hash table maintenance information */
 605         struct hlist_node uidhash_node;
 606         uid_t uid;
 607
 608 #ifdef CONFIG_USER_SCHED
 609         struct task_group *tg;
 610 #ifdef CONFIG_SYSFS
 611         struct kobject kobj;
 612         struct work_struct work;
 613 #endif
 614 #endif
 615 };
 616
 617 extern int uids_sysfs_init(void);
 618
 619 extern struct user_struct *find_user(uid_t);
 620
 621 extern struct user_struct root_user;
 622 #define INIT_USER (&root_user)
 623
 624 struct backing_dev_info;
 625 struct reclaim_state;
 626
 627 #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
 628 struct sched_info {
 629         /* cumulative counters */
 630         unsigned long pcount;         /* # of times run on this cpu */
 631         unsigned long long cpu_time,  /* time spent on the cpu */
 632                            run_delay; /* time spent waiting on a runqueue */
 633
 634         /* timestamps */
 635         unsigned long long last_arrival,/* when we last ran on a cpu */
 636                            last_queued; /* when we were last queued to run */
 637 #ifdef CONFIG_SCHEDSTATS
 638         /* BKL stats */
 639         unsigned int bkl_count;
 640 #endif
 641 };
 642 #endif /* defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) */
 643
 644 #ifdef CONFIG_SCHEDSTATS
 645 extern const struct file_operations proc_schedstat_operations;
 646 #endif /* CONFIG_SCHEDSTATS */
 647
 648 #ifdef CONFIG_TASK_DELAY_ACCT
 649 struct task_delay_info {
 650         spinlock_t      lock;
 651         unsigned int    flags;  /* Private per-task flags */
 652
 653         /* For each stat XXX, add following, aligned appropriately
 654          *
 655          * struct timespec XXX_start, XXX_end;
 656          * u64 XXX_delay;
 657          * u32 XXX_count;
 658          *
 659          * Atomicity of updates to XXX_delay, XXX_count protected by
 660          * single lock above (split into XXX_lock if contention is an issue).
 661          */
 662
 663         /*
 664          * XXX_count is incremented on every XXX operation, the delay
 665          * associated with the operation is added to XXX_delay.
 666          * XXX_delay contains the accumulated delay time in nanoseconds.
 667          */
 668         struct timespec blkio_start, blkio_end; /* Shared by blkio, swapin */
 669         u64 blkio_delay;        /* wait for sync block io completion */
 670         u64 swapin_delay;       /* wait for swapin block io completion */
 671         u32 blkio_count;        /* total count of the number of sync block */
 672                                 /* io operations performed */
 673         u32 swapin_count;       /* total count of the number of swapin block */
 674                                 /* io operations performed */
 675
 676         struct timespec freepages_start, freepages_end;
 677         u64 freepages_delay;    /* wait for memory reclaim */
 678         u32 freepages_count;    /* total count of memory reclaim */
 679 };
 680 #endif  /* CONFIG_TASK_DELAY_ACCT */
 681
 682 static inline int sched_info_on(void)
 683 {
 684 #ifdef CONFIG_SCHEDSTATS
 685         return 1;
 686 #elif defined(CONFIG_TASK_DELAY_ACCT)
 687         extern int delayacct_on;
 688         return delayacct_on;
 689 #else
 690         return 0;
 691 #endif
 692 }
 693
 694 enum cpu_idle_type {
 695         CPU_IDLE,
 696         CPU_NOT_IDLE,
 697         CPU_NEWLY_IDLE,
 698         CPU_MAX_IDLE_TYPES
 699 };
 700
 701 /*
 702  * sched-domains (multiprocessor balancing) declarations:
 703  */
 704
 705 /*
 706  * Increase resolution of nice-level calculations:
 707  */
 708 #define SCHED_LOAD_SHIFT        10
 709 #define SCHED_LOAD_SCALE        (1L << SCHED_LOAD_SHIFT)
 710
 711 #define SCHED_LOAD_SCALE_FUZZ   SCHED_LOAD_SCALE
 712
 713 #ifdef CONFIG_SMP
 714 #define SD_LOAD_BALANCE         1       /* Do load balancing on this domain. */
 715 #define SD_BALANCE_NEWIDLE      2       /* Balance when about to become idle */
 716 #define SD_BALANCE_EXEC         4       /* Balance on exec */
 717 #define SD_BALANCE_FORK         8       /* Balance on fork, clone */
 718 #define SD_WAKE_IDLE            16      /* Wake to idle CPU on task wakeup */
 719 #define SD_WAKE_AFFINE          32      /* Wake task to waking CPU */
 720 #define SD_WAKE_BALANCE         64      /* Perform balancing at task wakeup */
 721 #define SD_SHARE_CPUPOWER       128     /* Domain members share cpu power */
 722 #define SD_POWERSAVINGS_BALANCE 256     /* Balance for power savings */
 723 #define SD_SHARE_PKG_RESOURCES  512     /* Domain members share cpu pkg resources */
 724 #define SD_SERIALIZE            1024    /* Only a single load balancing instance */
 725 #define SD_WAKE_IDLE_FAR        2048    /* Gain latency sacrificing cache hit */
 726
 727 #define BALANCE_FOR_MC_POWER    \
 728         (sched_smt_power_savings ? SD_POWERSAVINGS_BALANCE : 0)
 729
 730 #define BALANCE_FOR_PKG_POWER   \
 731         ((sched_mc_power_savings || sched_smt_power_savings) ?  \
 732          SD_POWERSAVINGS_BALANCE : 0)
 733
 734 #define test_sd_parent(sd, flag)        ((sd->parent &&         \
 735                                          (sd->parent->flags & flag)) ? 1 : 0)
 736
 737
 738 struct sched_group {
 739         struct sched_group *next;       /* Must be a circular list */
 740         cpumask_t cpumask;
 741
 742         /*
 743          * CPU power of this group, SCHED_LOAD_SCALE being max power for a
 744          * single CPU. This is read only (except for setup, hotplug CPU).
 745          * Note : Never change cpu_power without recompute its reciprocal
 746          */
 747         unsigned int __cpu_power;
 748         /*
 749          * reciprocal value of cpu_power to avoid expensive divides
 750          * (see include/linux/reciprocal_div.h)
 751          */
 752         u32 reciprocal_cpu_power;
 753 };
 754
 755 enum sched_domain_level {
 756         SD_LV_NONE = 0,
 757         SD_LV_SIBLING,
 758         SD_LV_MC,
 759         SD_LV_CPU,
 760         SD_LV_NODE,
 761         SD_LV_ALLNODES,
 762         SD_LV_MAX
 763 };
 764
 765 struct sched_domain_attr {
 766         int relax_domain_level;
 767 };
 768
 769 #define SD_ATTR_INIT    (struct sched_domain_attr) {    \
 770         .relax_domain_level = -1,                       \
 771 }
 772
 773 struct sched_domain {
 774         /* These fields must be setup */
 775         struct sched_domain *parent;    /* top domain must be null terminated */
 776         struct sched_domain *child;     /* bottom domain must be null terminated */
 777         struct sched_group *groups;     /* the balancing groups of the domain */
 778         cpumask_t span;                 /* span of all CPUs in this domain */
 779         unsigned long min_interval;     /* Minimum balance interval ms */
 780         unsigned long max_interval;     /* Maximum balance interval ms */
 781         unsigned int busy_factor;       /* less balancing by factor if busy */
 782         unsigned int imbalance_pct;     /* No balance until over watermark */
 783         unsigned int cache_nice_tries;  /* Leave cache hot tasks for # tries */
 784         unsigned int busy_idx;
 785         unsigned int idle_idx;
 786         unsigned int newidle_idx;
 787         unsigned int wake_idx;
 788         unsigned int forkexec_idx;
 789         int flags;                      /* See SD_* */
 790         enum sched_domain_level level;
 791
 792         /* Runtime fields. */
 793         unsigned long last_balance;     /* init to jiffies. units in jiffies */
 794         unsigned int balance_interval;  /* initialise to 1. units in ms. */
 795         unsigned int nr_balance_failed; /* initialise to 0 */
 796
 797         u64 last_update;
 798
 799 #ifdef CONFIG_SCHEDSTATS
 800         /* load_balance() stats */
 801         unsigned int lb_count[CPU_MAX_IDLE_TYPES];
 802         unsigned int lb_failed[CPU_MAX_IDLE_TYPES];
 803         unsigned int lb_balanced[CPU_MAX_IDLE_TYPES];
 804         unsigned int lb_imbalance[CPU_MAX_IDLE_TYPES];
 805         unsigned int lb_gained[CPU_MAX_IDLE_TYPES];
 806         unsigned int lb_hot_gained[CPU_MAX_IDLE_TYPES];
 807         unsigned int lb_nobusyg[CPU_MAX_IDLE_TYPES];
 808         unsigned int lb_nobusyq[CPU_MAX_IDLE_TYPES];
 809
 810         /* Active load balancing */
 811         unsigned int alb_count;
 812         unsigned int alb_failed;
 813         unsigned int alb_pushed;
 814
 815         /* SD_BALANCE_EXEC stats */
 816         unsigned int sbe_count;
 817         unsigned int sbe_balanced;
 818         unsigned int sbe_pushed;
 819
 820         /* SD_BALANCE_FORK stats */
 821         unsigned int sbf_count;
 822         unsigned int sbf_balanced;
 823         unsigned int sbf_pushed;
 824
 825         /* try_to_wake_up() stats */
 826         unsigned int ttwu_wake_remote;
 827         unsigned int ttwu_move_affine;
 828         unsigned int ttwu_move_balance;
 829 #endif
 830 };
 831
 832 extern void partition_sched_domains(int ndoms_new, cpumask_t *doms_new,
 833                                     struct sched_domain_attr *dattr_new);
 834 extern int arch_reinit_sched_domains(void);
 835
 836 #else /* CONFIG_SMP */
 837
 838 struct sched_domain_attr;
 839
 840 static inline void
 841 partition_sched_domains(int ndoms_new, cpumask_t *doms_new,
 842                         struct sched_domain_attr *dattr_new)
 843 {
 844 }
 845 #endif  /* !CONFIG_SMP */
 846
 847 struct io_context;                      /* See blkdev.h */
 848 #define NGROUPS_SMALL           32
 849 #define NGROUPS_PER_BLOCK       ((unsigned int)(PAGE_SIZE / sizeof(gid_t)))
 850 struct group_info {
 851         int ngroups;
 852         atomic_t usage;
 853         gid_t small_block[NGROUPS_SMALL];
 854         int nblocks;
 855         gid_t *blocks[0];
 856 };
 857
 858 /*
 859  * get_group_info() must be called with the owning task locked (via task_lock())
 860  * when task != current.  The reason being that the vast majority of callers are
 861  * looking at current->group_info, which can not be changed except by the
 862  * current task.  Changing current->group_info requires the task lock, too.
 863  */
 864 #define get_group_info(group_info) do { \
 865         atomic_inc(&(group_info)->usage); \
 866 } while (0)
 867
 868 #define put_group_info(group_info) do { \
 869         if (atomic_dec_and_test(&(group_info)->usage)) \
 870                 groups_free(group_info); \
 871 } while (0)
 872
 873 extern struct group_info *groups_alloc(int gidsetsize);
 874 extern void groups_free(struct group_info *group_info);
 875 extern int set_current_groups(struct group_info *group_info);
 876 extern int groups_search(struct group_info *group_info, gid_t grp);
 877 /* access the groups "array" with this macro */
 878 #define GROUP_AT(gi, i) \
 879     ((gi)->blocks[(i)/NGROUPS_PER_BLOCK][(i)%NGROUPS_PER_BLOCK])
 880
 881 #ifdef ARCH_HAS_PREFETCH_SWITCH_STACK
 882 extern void prefetch_stack(struct task_struct *t);
 883 #else
 884 static inline void prefetch_stack(struct task_struct *t) { }
 885 #endif
 886
 887 struct audit_context;           /* See audit.c */
 888 struct mempolicy;
 889 struct pipe_inode_info;
 890 struct uts_namespace;
 891
 892 struct rq;
 893 struct sched_domain;
 894
 895 struct sched_class {
 896         const struct sched_class *next;
 897
 898         void (*enqueue_task) (struct rq *rq, struct task_struct *p, int wakeup);
 899         void (*dequeue_task) (struct rq *rq, struct task_struct *p, int sleep);
 900         void (*yield_task) (struct rq *rq);
 901         int  (*select_task_rq)(struct task_struct *p, int sync);
 902
 903         void (*check_preempt_curr) (struct rq *rq, struct task_struct *p);
 904
 905         struct task_struct * (*pick_next_task) (struct rq *rq);
 906         void (*put_prev_task) (struct rq *rq, struct task_struct *p);
 907
 908 #ifdef CONFIG_SMP
 909         unsigned long (*load_balance) (struct rq *this_rq, int this_cpu,
 910                         struct rq *busiest, unsigned long max_load_move,
 911                         struct sched_domain *sd, enum cpu_idle_type idle,
 912                         int *all_pinned, int *this_best_prio);
 913
 914         int (*move_one_task) (struct rq *this_rq, int this_cpu,
 915                               struct rq *busiest, struct sched_domain *sd,
 916                               enum cpu_idle_type idle);
 917         void (*pre_schedule) (struct rq *this_rq, struct task_struct *task);
 918         void (*post_schedule) (struct rq *this_rq);
 919         void (*task_wake_up) (struct rq *this_rq, struct task_struct *task);
 920 #endif
 921
 922         void (*set_curr_task) (struct rq *rq);
 923         void (*task_tick) (struct rq *rq, struct task_struct *p, int queued);
 924         void (*task_new) (struct rq *rq, struct task_struct *p);
 925         void (*set_cpus_allowed)(struct task_struct *p,
 926                                  const cpumask_t *newmask);
 927
 928         void (*rq_online)(struct rq *rq);
 929         void (*rq_offline)(struct rq *rq);
 930
 931         void (*switched_from) (struct rq *this_rq, struct task_struct *task,
 932                                int running);
 933         void (*switched_to) (struct rq *this_rq, struct task_struct *task,
 934                              int running);
 935         void (*prio_changed) (struct rq *this_rq, struct task_struct *task,
 936                              int oldprio, int running);
 937
 938 #ifdef CONFIG_FAIR_GROUP_SCHED
 939         void (*moved_group) (struct task_struct *p);
 940 #endif
 941 };
 942
 943 struct load_weight {
 944         unsigned long weight, inv_weight;
 945 };
 946
 947 /*
 948  * CFS stats for a schedulable entity (task, task-group etc)
 949  *
 950  * Current field usage histogram:
 951  *
 952  *     4 se->block_start
 953  *     4 se->run_node
 954  *     4 se->sleep_start
 955  *     6 se->load.weight
 956  */
 957 struct sched_entity {
 958         struct load_weight      load;           /* for load-balancing */
 959         struct rb_node          run_node;
 960         struct list_head        group_node;
 961         unsigned int            on_rq;
 962
 963         u64                     exec_start;
 964         u64                     sum_exec_runtime;
 965         u64                     vruntime;
 966         u64                     prev_sum_exec_runtime;
 967
 968         u64                     last_wakeup;
 969         u64                     avg_overlap;
 970
 971 #ifdef CONFIG_SCHEDSTATS
 972         u64                     wait_start;
 973         u64                     wait_max;
 974         u64                     wait_count;
 975         u64                     wait_sum;
 976
 977         u64                     sleep_start;
 978         u64                     sleep_max;
 979         s64                     sum_sleep_runtime;
 980
 981         u64                     block_start;
 982         u64                     block_max;
 983         u64                     exec_max;
 984         u64                     slice_max;
 985
 986         u64                     nr_migrations;
 987         u64                     nr_migrations_cold;
 988         u64                     nr_failed_migrations_affine;
 989         u64                     nr_failed_migrations_running;
 990         u64                     nr_failed_migrations_hot;
 991         u64                     nr_forced_migrations;
 992         u64                     nr_forced2_migrations;
 993
 994         u64                     nr_wakeups;
 995         u64                     nr_wakeups_sync;
 996         u64                     nr_wakeups_migrate;
 997         u64                     nr_wakeups_local;
 998         u64                     nr_wakeups_remote;
 999         u64                     nr_wakeups_affine;
1000         u64                     nr_wakeups_affine_attempts;
1001         u64                     nr_wakeups_passive;
1002         u64                     nr_wakeups_idle;
1003 #endif
1004
1005 #ifdef CONFIG_FAIR_GROUP_SCHED
1006         struct sched_entity     *parent;
1007         /* rq on which this entity is (to be) queued: */
1008         struct cfs_rq           *cfs_rq;
1009         /* rq "owned" by this entity/group: */
1010         struct cfs_rq           *my_q;
1011 #endif
1012 };
1013
1014 struct sched_rt_entity {
1015         struct list_head run_list;
1016         unsigned int time_slice;
1017         unsigned long timeout;
1018         int nr_cpus_allowed;
1019
1020         struct sched_rt_entity *back;
1021 #ifdef CONFIG_RT_GROUP_SCHED
1022         struct sched_rt_entity  *parent;
1023         /* rq on which this entity is (to be) queued: */
1024         struct rt_rq            *rt_rq;
1025         /* rq "owned" by this entity/group: */
1026         struct rt_rq            *my_q;
1027 #endif
1028 };
1029
1030 struct task_struct {
1031         volatile long state;    /* -1 unrunnable, 0 runnable, >0 stopped */
1032         void *stack;
1033         atomic_t usage;
1034         unsigned int flags;     /* per process flags, defined below */
1035         unsigned int ptrace;
1036
1037         int lock_depth;         /* BKL lock depth */
1038
1039 #ifdef CONFIG_SMP
1040 #ifdef __ARCH_WANT_UNLOCKED_CTXSW
1041         int oncpu;
1042 #endif
1043 #endif
1044
1045         int prio, static_prio, normal_prio;
1046         unsigned int rt_priority;
1047         const struct sched_class *sched_class;
1048         struct sched_entity se;
1049         struct sched_rt_entity rt;
1050
1051 #ifdef CONFIG_PREEMPT_NOTIFIERS
1052         /* list of struct preempt_notifier: */
1053         struct hlist_head preempt_notifiers;
1054 #endif
1055
1056         /*
1057          * fpu_counter contains the number of consecutive context switches
1058          * that the FPU is used. If this is over a threshold, the lazy fpu
1059          * saving becomes unlazy to save the trap. This is an unsigned char
1060          * so that after 256 times the counter wraps and the behavior turns
1061          * lazy again; this to deal with bursty apps that only use FPU for
1062          * a short time
1063          */
1064         unsigned char fpu_counter;
1065         s8 oomkilladj; /* OOM kill score adjustment (bit shift). */
1066 #ifdef CONFIG_BLK_DEV_IO_TRACE
1067         unsigned int btrace_seq;
1068 #endif
1069
1070         unsigned int policy;
1071         cpumask_t cpus_allowed;
1072
1073 #ifdef CONFIG_PREEMPT_RCU
1074         int rcu_read_lock_nesting;
1075         int rcu_flipctr_idx;
1076 #endif /* #ifdef CONFIG_PREEMPT_RCU */
1077
1078 #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
1079         struct sched_info sched_info;
1080 #endif
1081
1082         struct list_head tasks;
1083
1084         struct mm_struct *mm, *active_mm;
1085
1086 /* task state */
1087         struct linux_binfmt *binfmt;
1088         int exit_state;
1089         int exit_code, exit_signal;
1090         int pdeath_signal;  /*  The signal sent when the parent dies  */
1091         /* ??? */
1092         unsigned int personality;
1093         unsigned did_exec:1;
1094         pid_t pid;
1095         pid_t tgid;
1096
1097 #ifdef CONFIG_CC_STACKPROTECTOR
1098         /* Canary value for the -fstack-protector gcc feature */
1099         unsigned long stack_canary;
1100 #endif
1101         /*
1102          * pointers to (original) parent process, youngest child, younger sibling,
1103          * older sibling, respectively.  (p->father can be replaced with
1104          * p->real_parent->pid)
1105          */
1106         struct task_struct *real_parent; /* real parent process */
1107         struct task_struct *parent; /* recipient of SIGCHLD, wait4() reports */
1108         /*
1109          * children/sibling forms the list of my natural children
1110          */
1111         struct list_head children;      /* list of my children */
1112         struct list_head sibling;       /* linkage in my parent's children list */
1113         struct task_struct *group_leader;       /* threadgroup leader */
1114
1115         /*
1116          * ptraced is the list of tasks this task is using ptrace on.
1117          * This includes both natural children and PTRACE_ATTACH targets.
1118          * p->ptrace_entry is p's link on the p->parent->ptraced list.
1119          */
1120         struct list_head ptraced;
1121         struct list_head ptrace_entry;
1122
1123         /* PID/PID hash table linkage. */
1124         struct pid_link pids[PIDTYPE_MAX];
1125         struct list_head thread_group;
1126
1127         struct completion *vfork_done;          /* for vfork() */
1128         int __user *set_child_tid;              /* CLONE_CHILD_SETTID */
1129         int __user *clear_child_tid;            /* CLONE_CHILD_CLEARTID */
1130
1131         cputime_t utime, stime, utimescaled, stimescaled;
1132         cputime_t gtime;
1133         cputime_t prev_utime, prev_stime;
1134         unsigned long nvcsw, nivcsw; /* context switch counts */
1135         struct timespec start_time;             /* monotonic time */
1136         struct timespec real_start_time;        /* boot based time */
1137 /* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */
1138         unsigned long min_flt, maj_flt;
1139
1140         cputime_t it_prof_expires, it_virt_expires;
1141         unsigned long long it_sched_expires;
1142         struct list_head cpu_timers[3];
1143
1144 /* process credentials */
1145         uid_t uid,euid,suid,fsuid;
1146         gid_t gid,egid,sgid,fsgid;
1147         struct group_info *group_info;
1148         kernel_cap_t   cap_effective, cap_inheritable, cap_permitted, cap_bset;
1149         struct user_struct *user;
1150         unsigned securebits;
1151 #ifdef CONFIG_KEYS
1152         unsigned char jit_keyring;      /* default keyring to attach requested keys to */
1153         struct key *request_key_auth;   /* assumed request_key authority */
1154         struct key *thread_keyring;     /* keyring private to this thread */
1155 #endif
1156         char comm[TASK_COMM_LEN]; /* executable name excluding path
1157                                      - access with [gs]et_task_comm (which lock
1158                                        it with task_lock())
1159                                      - initialized normally by flush_old_exec */
1160 /* file system info */
1161         int link_count, total_link_count;
1162 #ifdef CONFIG_SYSVIPC
1163 /* ipc stuff */
1164         struct sysv_sem sysvsem;
1165 #endif
1166 #ifdef CONFIG_DETECT_SOFTLOCKUP
1167 /* hung task detection */
1168         unsigned long last_switch_timestamp;
1169         unsigned long last_switch_count;
1170 #endif
1171 /* CPU-specific state of this task */
1172         struct thread_struct thread;
1173 /* filesystem information */
1174         struct fs_struct *fs;
1175 /* open file information */
1176         struct files_struct *files;
1177 /* namespaces */
1178         struct nsproxy *nsproxy;
1179 /* signal handlers */
1180         struct signal_struct *signal;
1181         struct sighand_struct *sighand;
1182
1183         sigset_t blocked, real_blocked;
1184         sigset_t saved_sigmask; /* restored if set_restore_sigmask() was used */
1185         struct sigpending pending;
1186
1187         unsigned long sas_ss_sp;
1188         size_t sas_ss_size;
1189         int (*notifier)(void *priv);
1190         void *notifier_data;
1191         sigset_t *notifier_mask;
1192 #ifdef CONFIG_SECURITY
1193         void *security;
1194 #endif
1195         struct audit_context *audit_context;
1196 #ifdef CONFIG_AUDITSYSCALL
1197         uid_t loginuid;
1198         unsigned int sessionid;
1199 #endif
1200         seccomp_t seccomp;
1201
1202 /* Thread group tracking */
1203         u32 parent_exec_id;
1204         u32 self_exec_id;
1205 /* Protection of (de-)allocation: mm, files, fs, tty, keyrings */
1206         spinlock_t alloc_lock;
1207
1208         /* Protection of the PI data structures: */
1209         spinlock_t pi_lock;
1210
1211 #ifdef CONFIG_RT_MUTEXES
1212         /* PI waiters blocked on a rt_mutex held by this task */
1213         struct plist_head pi_waiters;
1214         /* Deadlock detection and priority inheritance handling */
1215         struct rt_mutex_waiter *pi_blocked_on;
1216 #endif
1217
1218 #ifdef CONFIG_DEBUG_MUTEXES
1219         /* mutex deadlock detection */
1220         struct mutex_waiter *blocked_on;
1221 #endif
1222 #ifdef CONFIG_TRACE_IRQFLAGS
1223         unsigned int irq_events;
1224         int hardirqs_enabled;
1225         unsigned long hardirq_enable_ip;
1226         unsigned int hardirq_enable_event;
1227         unsigned long hardirq_disable_ip;
1228         unsigned int hardirq_disable_event;
1229         int softirqs_enabled;
1230         unsigned long softirq_disable_ip;
1231         unsigned int softirq_disable_event;
1232         unsigned long softirq_enable_ip;
1233         unsigned int softirq_enable_event;
1234         int hardirq_context;
1235         int softirq_context;
1236 #endif
1237 #ifdef CONFIG_LOCKDEP
1238 # define MAX_LOCK_DEPTH 48UL
1239         u64 curr_chain_key;
1240         int lockdep_depth;
1241         unsigned int lockdep_recursion;
1242         struct held_lock held_locks[MAX_LOCK_DEPTH];
1243 #endif
1244
1245 /* journalling filesystem info */
1246         void *journal_info;
1247
1248 /* stacked block device info */
1249         struct bio *bio_list, **bio_tail;
1250
1251 /* VM state */
1252         struct reclaim_state *reclaim_state;
1253
1254         struct backing_dev_info *backing_dev_info;
1255
1256         struct io_context *io_context;
1257
1258         unsigned long ptrace_message;
1259         siginfo_t *last_siginfo; /* For ptrace use.  */
1260 #ifdef CONFIG_TASK_XACCT
1261 /* i/o counters(bytes read/written, #syscalls */
1262         u64 rchar, wchar, syscr, syscw;
1263 #endif
1264         struct task_io_accounting ioac;
1265 #if defined(CONFIG_TASK_XACCT)
1266         u64 acct_rss_mem1;      /* accumulated rss usage */
1267         u64 acct_vm_mem1;       /* accumulated virtual memory usage */
1268         cputime_t acct_timexpd; /* stime + utime since last update */
1269 #endif
1270 #ifdef CONFIG_CPUSETS
1271         nodemask_t mems_allowed;
1272         int cpuset_mems_generation;
1273         int cpuset_mem_spread_rotor;
1274 #endif
1275 #ifdef CONFIG_CGROUPS
1276         /* Control Group info protected by css_set_lock */
1277         struct css_set *cgroups;
1278         /* cg_list protected by css_set_lock and tsk->alloc_lock */
1279         struct list_head cg_list;
1280 #endif
1281 #ifdef CONFIG_FUTEX
1282         struct robust_list_head __user *robust_list;
1283 #ifdef CONFIG_COMPAT
1284         struct compat_robust_list_head __user *compat_robust_list;
1285 #endif
1286         struct list_head pi_state_list;
1287         struct futex_pi_state *pi_state_cache;
1288 #endif
1289 #ifdef CONFIG_NUMA
1290         struct mempolicy *mempolicy;
1291         short il_next;
1292 #endif
1293         atomic_t fs_excl;       /* holding fs exclusive resources */
1294         struct rcu_head rcu;
1295
1296         /*
1297          * cache last used pipe for splice
1298          */
1299         struct pipe_inode_info *splice_pipe;
1300 #ifdef  CONFIG_TASK_DELAY_ACCT
1301         struct task_delay_info *delays;
1302 #endif
1303 #ifdef CONFIG_FAULT_INJECTION
1304         int make_it_fail;
1305 #endif
1306         struct prop_local_single dirties;
1307 #ifdef CONFIG_LATENCYTOP
1308         int latency_record_count;
1309         struct latency_record latency_record[LT_SAVECOUNT];
1310 #endif
1311 };
1312
1313 /*
1314  * Priority of a process goes from 0..MAX_PRIO-1, valid RT
1315  * priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL/SCHED_BATCH
1316  * tasks are in the range MAX_RT_PRIO..MAX_PRIO-1. Priority
1317  * values are inverted: lower p->prio value means higher priority.
1318  *
1319  * The MAX_USER_RT_PRIO value allows the actual maximum
1320  * RT priority to be separate from the value exported to
1321  * user-space.  This allows kernel threads to set their
1322  * priority to a value higher than any user task. Note:
1323  * MAX_RT_PRIO must not be smaller than MAX_USER_RT_PRIO.
1324  */
1325
1326 #define MAX_USER_RT_PRIO        100
1327 #define MAX_RT_PRIO             MAX_USER_RT_PRIO
1328
1329 #define MAX_PRIO                (MAX_RT_PRIO + 40)
1330 #define DEFAULT_PRIO            (MAX_RT_PRIO + 20)
1331
1332 static inline int rt_prio(int prio)
1333 {
1334         if (unlikely(prio < MAX_RT_PRIO))
1335                 return 1;
1336         return 0;
1337 }
1338
1339 static inline int rt_task(struct task_struct *p)
1340 {
1341         return rt_prio(p->prio);
1342 }
1343
1344 static inline void set_task_session(struct task_struct *tsk, pid_t session)
1345 {
1346         tsk->signal->__session = session;
1347 }
1348
1349 static inline void set_task_pgrp(struct task_struct *tsk, pid_t pgrp)
1350 {
1351         tsk->signal->__pgrp = pgrp;
1352 }
1353
1354 static inline struct pid *task_pid(struct task_struct *task)
1355 {
1356         return task->pids[PIDTYPE_PID].pid;
1357 }
1358
1359 static inline struct pid *task_tgid(struct task_struct *task)
1360 {
1361         return task->group_leader->pids[PIDTYPE_PID].pid;
1362 }
1363
1364 static inline struct pid *task_pgrp(struct task_struct *task)
1365 {
1366         return task->group_leader->pids[PIDTYPE_PGID].pid;
1367 }
1368
1369 static inline struct pid *task_session(struct task_struct *task)
1370 {
1371         return task->group_leader->pids[PIDTYPE_SID].pid;
1372 }
1373
1374 struct pid_namespace;
1375
1376 /*
1377  * the helpers to get the task's different pids as they are seen
1378  * from various namespaces
1379  *
1380  * task_xid_nr()     : global id, i.e. the id seen from the init namespace;
1381  * task_xid_vnr()    : virtual id, i.e. the id seen from the pid namespace of
1382  *                     current.
1383  * task_xid_nr_ns()  : id seen from the ns specified;
1384  *
1385  * set_task_vxid()   : assigns a virtual id to a task;
1386  *
1387  * see also pid_nr() etc in include/linux/pid.h
1388  */
1389
1390 static inline pid_t task_pid_nr(struct task_struct *tsk)
1391 {
1392         return tsk->pid;
1393 }
1394
1395 pid_t task_pid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);
1396
1397 static inline pid_t task_pid_vnr(struct task_struct *tsk)
1398 {
1399         return pid_vnr(task_pid(tsk));
1400 }
1401
1402
1403 static inline pid_t task_tgid_nr(struct task_struct *tsk)
1404 {
1405         return tsk->tgid;
1406 }
1407
1408 pid_t task_tgid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);
1409
1410 static inline pid_t task_tgid_vnr(struct task_struct *tsk)
1411 {
1412         return pid_vnr(task_tgid(tsk));
1413 }
1414
1415
1416 static inline pid_t task_pgrp_nr(struct task_struct *tsk)
1417 {
1418         return tsk->signal->__pgrp;
1419 }
1420
1421 pid_t task_pgrp_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);
1422
1423 static inline pid_t task_pgrp_vnr(struct task_struct *tsk)
1424 {
1425         return pid_vnr(task_pgrp(tsk));
1426 }
1427
1428
1429 static inline pid_t task_session_nr(struct task_struct *tsk)
1430 {
1431         return tsk->signal->__session;
1432 }
1433
1434 pid_t task_session_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);
1435
1436 static inline pid_t task_session_vnr(struct task_struct *tsk)
1437 {
1438         return pid_vnr(task_session(tsk));
1439 }
1440
1441
1442 /**
1443  * pid_alive - check that a task structure is not stale
1444  * @p: Task structure to be checked.
1445  *
1446  * Test if a process is not yet dead (at most zombie state)
1447  * If pid_alive fails, then pointers within the task structure
1448  * can be stale and must not be dereferenced.
1449  */
1450 static inline int pid_alive(struct task_struct *p)
1451 {
1452         return p->pids[PIDTYPE_PID].pid != NULL;
1453 }
1454
1455 /**
1456  * is_global_init - check if a task structure is init
1457  * @tsk: Task structure to be checked.
1458  *
1459  * Check if a task structure is the first user space task the kernel created.
1460  */
1461 static inline int is_global_init(struct task_struct *tsk)
1462 {
1463         return tsk->pid == 1;
1464 }
1465
1466 /*
1467  * is_container_init:
1468  * check whether in the task is init in its own pid namespace.
1469  */
1470 extern int is_container_init(struct task_struct *tsk);
1471
1472 extern struct pid *cad_pid;
1473
1474 extern void free_task(struct task_struct *tsk);
1475 #define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0)
1476
1477 extern void __put_task_struct(struct task_struct *t);
1478
1479 static inline void put_task_struct(struct task_struct *t)
1480 {
1481         if (atomic_dec_and_test(&t->usage))
1482                 __put_task_struct(t);
1483 }
1484
1485 /*
1486  * Per process flags
1487  */
1488 #define PF_ALIGNWARN    0x00000001      /* Print alignment warning msgs */
1489                                         /* Not implemented yet, only for 486*/
1490 #define PF_STARTING     0x00000002      /* being created */
1491 #define PF_EXITING      0x00000004      /* getting shut down */
1492 #define PF_EXITPIDONE   0x00000008      /* pi exit done on shut down */
1493 #define PF_VCPU         0x00000010      /* I'm a virtual CPU */
1494 #define PF_FORKNOEXEC   0x00000040      /* forked but didn't exec */
1495 #define PF_SUPERPRIV    0x00000100      /* used super-user privileges */
1496 #define PF_DUMPCORE     0x00000200      /* dumped core */
1497 #define PF_SIGNALED     0x00000400      /* killed by a signal */
1498 #define PF_MEMALLOC     0x00000800      /* Allocating memory */
1499 #define PF_FLUSHER      0x00001000      /* responsible for disk writeback */
1500 #define PF_USED_MATH    0x00002000      /* if unset the fpu must be initialized before use */
1501 #define PF_NOFREEZE     0x00008000      /* this thread should not be frozen */
1502 #define PF_FROZEN       0x00010000      /* frozen for system suspend */
1503 #define PF_FSTRANS      0x00020000      /* inside a filesystem transaction */
1504 #define PF_KSWAPD       0x00040000      /* I am kswapd */
1505 #define PF_SWAPOFF      0x00080000      /* I am in swapoff */
1506 #define PF_LESS_THROTTLE 0x00100000     /* Throttle me less: I clean memory */
1507 #define PF_KTHREAD      0x00200000      /* I am a kernel thread */
1508 #define PF_RANDOMIZE    0x00400000      /* randomize virtual address space */
1509 #define PF_SWAPWRITE    0x00800000      /* Allowed to write to swap */
1510 #define PF_SPREAD_PAGE  0x01000000      /* Spread page cache over cpuset */
1511 #define PF_SPREAD_SLAB  0x02000000      /* Spread some slab caches over cpuset */
1512 #define PF_THREAD_BOUND 0x04000000      /* Thread bound to specific cpu */
1513 #define PF_MEMPOLICY    0x10000000      /* Non-default NUMA mempolicy */
1514 #define PF_MUTEX_TESTER 0x20000000      /* Thread belongs to the rt mutex tester */
1515 #define PF_FREEZER_SKIP 0x40000000      /* Freezer should not count it as freezeable */
1516 #define PF_FREEZER_NOSIG 0x80000000     /* Freezer won't send signals to it */
1517
1518 /*
1519  * Only the _current_ task can read/write to tsk->flags, but other
1520  * tasks can access tsk->flags in readonly mode for example
1521  * with tsk_used_math (like during threaded core dumping).
1522  * There is however an exception to this rule during ptrace
1523  * or during fork: the ptracer task is allowed to write to the
1524  * child->flags of its traced child (same goes for fork, the parent
1525  * can write to the child->flags), because we're guaranteed the
1526  * child is not running and in turn not changing child->flags
1527  * at the same time the parent does it.
1528  */
1529 #define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0)
1530 #define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0)
1531 #define clear_used_math() clear_stopped_child_used_math(current)
1532 #define set_used_math() set_stopped_child_used_math(current)
1533 #define conditional_stopped_child_used_math(condition, child) \
1534         do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0)
1535 #define conditional_used_math(condition) \
1536         conditional_stopped_child_used_math(condition, current)
1537 #define copy_to_stopped_child_used_math(child) \
1538         do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0)
1539 /* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */
1540 #define tsk_used_math(p) ((p)->flags & PF_USED_MATH)
1541 #define used_math() tsk_used_math(current)
1542
1543 #ifdef CONFIG_SMP
1544 extern int set_cpus_allowed_ptr(struct task_struct *p,
1545                                 const cpumask_t *new_mask);
1546 #else
1547 static inline int set_cpus_allowed_ptr(struct task_struct *p,
1548                                        const cpumask_t *new_mask)
1549 {
1550         if (!cpu_isset(0, *new_mask))
1551                 return -EINVAL;
1552         return 0;
1553 }
1554 #endif
1555 static inline int set_cpus_allowed(struct task_struct *p, cpumask_t new_mask)
1556 {
1557         return set_cpus_allowed_ptr(p, &new_mask);
1558 }
1559
1560 extern unsigned long long sched_clock(void);
1561
1562 #ifndef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK
1563 static inline void sched_clock_init(void)
1564 {
1565 }
1566
1567 static inline u64 sched_clock_cpu(int cpu)
1568 {
1569         return sched_clock();
1570 }
1571
1572 static inline void sched_clock_tick(void)
1573 {
1574 }
1575
1576 static inline void sched_clock_idle_sleep_event(void)
1577 {
1578 }
1579
1580 static inline void sched_clock_idle_wakeup_event(u64 delta_ns)
1581 {
1582 }
1583
1584 #ifdef CONFIG_NO_HZ
1585 static inline void sched_clock_tick_stop(int cpu)
1586 {
1587 }
1588
1589 static inline void sched_clock_tick_start(int cpu)
1590 {
1591 }
1592 #endif
1593
1594 #else /* CONFIG_HAVE_UNSTABLE_SCHED_CLOCK */
1595 extern void sched_clock_init(void);
1596 extern u64 sched_clock_cpu(int cpu);
1597 extern void sched_clock_tick(void);
1598 extern void sched_clock_idle_sleep_event(void);
1599 extern void sched_clock_idle_wakeup_event(u64 delta_ns);
1600 #ifdef CONFIG_NO_HZ
1601 extern void sched_clock_tick_stop(int cpu);
1602 extern void sched_clock_tick_start(int cpu);
1603 #endif
1604 #endif /* CONFIG_HAVE_UNSTABLE_SCHED_CLOCK */
1605
1606 /*
1607  * For kernel-internal use: high-speed (but slightly incorrect) per-cpu
1608  * clock constructed from sched_clock():
1609  */
1610 extern unsigned long long cpu_clock(int cpu);
1611
1612 extern unsigned long long
1613 task_sched_runtime(struct task_struct *task);
1614
1615 /* sched_exec is called by processes performing an exec */
1616 #ifdef CONFIG_SMP
1617 extern void sched_exec(void);
1618 #else
1619 #define sched_exec()   {}
1620 #endif
1621
1622 extern void sched_clock_idle_sleep_event(void);
1623 extern void sched_clock_idle_wakeup_event(u64 delta_ns);
1624
1625 #ifdef CONFIG_HOTPLUG_CPU
1626 extern void idle_task_exit(void);
1627 #else
1628 static inline void idle_task_exit(void) {}
1629 #endif
1630
1631 extern void sched_idle_next(void);
1632
1633 #if defined(CONFIG_NO_HZ) && defined(CONFIG_SMP)
1634 extern void wake_up_idle_cpu(int cpu);
1635 #else
1636 static inline void wake_up_idle_cpu(int cpu) { }
1637 #endif
1638
1639 #ifdef CONFIG_SCHED_DEBUG
1640 extern unsigned int sysctl_sched_latency;
1641 extern unsigned int sysctl_sched_min_granularity;
1642 extern unsigned int sysctl_sched_wakeup_granularity;
1643 extern unsigned int sysctl_sched_child_runs_first;
1644 extern unsigned int sysctl_sched_features;
1645 extern unsigned int sysctl_sched_migration_cost;
1646 extern unsigned int sysctl_sched_nr_migrate;
1647 extern unsigned int sysctl_sched_shares_ratelimit;
1648
1649 int sched_nr_latency_handler(struct ctl_table *table, int write,
1650                 struct file *file, void __user *buffer, size_t *length,
1651                 loff_t *ppos);
1652 #endif
1653 extern unsigned int sysctl_sched_rt_period;
1654 extern int sysctl_sched_rt_runtime;
1655
1656 int sched_rt_handler(struct ctl_table *table, int write,
1657                 struct file *filp, void __user *buffer, size_t *lenp,
1658                 loff_t *ppos);
1659
1660 extern unsigned int sysctl_sched_compat_yield;
1661
1662 #ifdef CONFIG_RT_MUTEXES
1663 extern int rt_mutex_getprio(struct task_struct *p);
1664 extern void rt_mutex_setprio(struct task_struct *p, int prio);
1665 extern void rt_mutex_adjust_pi(struct task_struct *p);
1666 #else
1667 static inline int rt_mutex_getprio(struct task_struct *p)
1668 {
1669         return p->normal_prio;
1670 }
1671 # define rt_mutex_adjust_pi(p)          do { } while (0)
1672 #endif
1673
1674 extern void set_user_nice(struct task_struct *p, long nice);
1675 extern int task_prio(const struct task_struct *p);
1676 extern int task_nice(const struct task_struct *p);
1677 extern int can_nice(const struct task_struct *p, const int nice);
1678 extern int task_curr(const struct task_struct *p);
1679 extern int idle_cpu(int cpu);
1680 extern int sched_setscheduler(struct task_struct *, int, struct sched_param *);
1681 extern int sched_setscheduler_nocheck(struct task_struct *, int,
1682                                       struct sched_param *);
1683 extern struct task_struct *idle_task(int cpu);
1684 extern struct task_struct *curr_task(int cpu);
1685 extern void set_curr_task(int cpu, struct task_struct *p);
1686
1687 void yield(void);
1688
1689 /*
1690  * The default (Linux) execution domain.
1691  */
1692 extern struct exec_domain       default_exec_domain;
1693
1694 union thread_union {
1695         struct thread_info thread_info;
1696         unsigned long stack[THREAD_SIZE/sizeof(long)];
1697 };
1698
1699 #ifndef __HAVE_ARCH_KSTACK_END
1700 static inline int kstack_end(void *addr)
1701 {
1702         /* Reliable end of stack detection:
1703          * Some APM bios versions misalign the stack
1704          */
1705         return !(((unsigned long)addr+sizeof(void*)-1) & (THREAD_SIZE-sizeof(void*)));
1706 }
1707 #endif
1708
1709 extern union thread_union init_thread_union;
1710 extern struct task_struct init_task;
1711
1712 extern struct   mm_struct init_mm;
1713
1714 extern struct pid_namespace init_pid_ns;
1715
1716 /*
1717  * find a task by one of its numerical ids
1718  *
1719  * find_task_by_pid_type_ns():
1720  *      it is the most generic call - it finds a task by all id,
1721  *      type and namespace specified
1722  * find_task_by_pid_ns():
1723  *      finds a task by its pid in the specified namespace
1724  * find_task_by_vpid():
1725  *      finds a task by its virtual pid
1726  *
1727  * see also find_vpid() etc in include/linux/pid.h
1728  */
1729
1730 extern struct task_struct *find_task_by_pid_type_ns(int type, int pid,
1731                 struct pid_namespace *ns);
1732
1733 extern struct task_struct *find_task_by_vpid(pid_t nr);
1734 extern struct task_struct *find_task_by_pid_ns(pid_t nr,
1735                 struct pid_namespace *ns);
1736
1737 extern void __set_special_pids(struct pid *pid);
1738
1739 /* per-UID process charging. */
1740 extern struct user_struct * alloc_uid(struct user_namespace *, uid_t);
1741 static inline struct user_struct *get_uid(struct user_struct *u)
1742 {
1743         atomic_inc(&u->__count);
1744         return u;
1745 }
1746 extern void free_uid(struct user_struct *);
1747 extern void switch_uid(struct user_struct *);
1748 extern void release_uids(struct user_namespace *ns);
1749
1750 #include <asm/current.h>
1751
1752 extern void do_timer(unsigned long ticks);
1753
1754 extern int wake_up_state(struct task_struct *tsk, unsigned int state);
1755 extern int wake_up_process(struct task_struct *tsk);
1756 extern void wake_up_new_task(struct task_struct *tsk,
1757                                 unsigned long clone_flags);
1758 #ifdef CONFIG_SMP
1759  extern void kick_process(struct task_struct *tsk);
1760 #else
1761  static inline void kick_process(struct task_struct *tsk) { }
1762 #endif
1763 extern void sched_fork(struct task_struct *p, int clone_flags);
1764 extern void sched_dead(struct task_struct *p);
1765
1766 extern int in_group_p(gid_t);
1767 extern int in_egroup_p(gid_t);
1768
1769 extern void proc_caches_init(void);
1770 extern void flush_signals(struct task_struct *);
1771 extern void ignore_signals(struct task_struct *);
1772 extern void flush_signal_handlers(struct task_struct *, int force_default);
1773 extern int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info);
1774
1775 static inline int dequeue_signal_lock(struct task_struct *tsk, sigset_t *mask, siginfo_t *info)
1776 {
1777         unsigned long flags;
1778         int ret;
1779
1780         spin_lock_irqsave(&tsk->sighand->siglock, flags);
1781         ret = dequeue_signal(tsk, mask, info);
1782         spin_unlock_irqrestore(&tsk->sighand->siglock, flags);
1783
1784         return ret;
1785 }
1786
1787 extern void block_all_signals(int (*notifier)(void *priv), void *priv,
1788                               sigset_t *mask);
1789 extern void unblock_all_signals(void);
1790 extern void release_task(struct task_struct * p);
1791 extern int send_sig_info(int, struct siginfo *, struct task_struct *);
1792 extern int force_sigsegv(int, struct task_struct *);
1793 extern int force_sig_info(int, struct siginfo *, struct task_struct *);
1794 extern int __kill_pgrp_info(int sig, struct siginfo *info, struct pid *pgrp);
1795 extern int kill_pid_info(int sig, struct siginfo *info, struct pid *pid);
1796 extern int kill_pid_info_as_uid(int, struct siginfo *, struct pid *, uid_t, uid_t, u32);
1797 extern int kill_pgrp(struct pid *pid, int sig, int priv);
1798 extern int kill_pid(struct pid *pid, int sig, int priv);
1799 extern int kill_proc_info(int, struct siginfo *, pid_t);
1800 extern void do_notify_parent(struct task_struct *, int);
1801 extern void force_sig(int, struct task_struct *);
1802 extern void force_sig_specific(int, struct task_struct *);
1803 extern int send_sig(int, struct task_struct *, int);
1804 extern void zap_other_threads(struct task_struct *p);
1805 extern struct sigqueue *sigqueue_alloc(void);
1806 extern void sigqueue_free(struct sigqueue *);
1807 extern int send_sigqueue(struct sigqueue *,  struct task_struct *, int group);
1808 extern int do_sigaction(int, struct k_sigaction *, struct k_sigaction *);
1809 extern int do_sigaltstack(const stack_t __user *, stack_t __user *, unsigned long);
1810
1811 static inline int kill_cad_pid(int sig, int priv)
1812 {
1813         return kill_pid(cad_pid, sig, priv);
1814 }
1815
1816 /* These can be the second arg to send_sig_info/send_group_sig_info.  */
1817 #define SEND_SIG_NOINFO ((struct siginfo *) 0)
1818 #define SEND_SIG_PRIV   ((struct siginfo *) 1)
1819 #define SEND_SIG_FORCED ((struct siginfo *) 2)
1820
1821 static inline int is_si_special(const struct siginfo *info)
1822 {
1823         return info <= SEND_SIG_FORCED;
1824 }
1825
1826 /* True if we are on the alternate signal stack.  */
1827
1828 static inline int on_sig_stack(unsigned long sp)
1829 {
1830         return (sp - current->sas_ss_sp < current->sas_ss_size);
1831 }
1832
1833 static inline int sas_ss_flags(unsigned long sp)
1834 {
1835         return (current->sas_ss_size == 0 ? SS_DISABLE
1836                 : on_sig_stack(sp) ? SS_ONSTACK : 0);
1837 }
1838
1839 /*
1840  * Routines for handling mm_structs
1841  */
1842 extern struct mm_struct * mm_alloc(void);
1843
1844 /* mmdrop drops the mm and the page tables */
1845 extern void __mmdrop(struct mm_struct *);
1846 static inline void mmdrop(struct mm_struct * mm)
1847 {
1848         if (unlikely(atomic_dec_and_test(&mm->mm_count)))
1849                 __mmdrop(mm);
1850 }
1851
1852 /* mmput gets rid of the mappings and all user-space */
1853 extern void mmput(struct mm_struct *);
1854 /* Grab a reference to a task's mm, if it is not already going away */
1855 extern struct mm_struct *get_task_mm(struct task_struct *task);
1856 /* Remove the current tasks stale references to the old mm_struct */
1857 extern void mm_release(struct task_struct *, struct mm_struct *);
1858 /* Allocate a new mm structure and copy contents from tsk->mm */
1859 extern struct mm_struct *dup_mm(struct task_struct *tsk);
1860
1861 extern int  copy_thread(int, unsigned long, unsigned long, unsigned long, struct task_struct *, struct pt_regs *);
1862 extern void flush_thread(void);
1863 extern void exit_thread(void);
1864
1865 extern void exit_files(struct task_struct *);
1866 extern void __cleanup_signal(struct signal_struct *);
1867 extern void __cleanup_sighand(struct sighand_struct *);
1868
1869 extern void exit_itimers(struct signal_struct *);
1870 extern void flush_itimer_signals(void);
1871
1872 extern NORET_TYPE void do_group_exit(int);
1873
1874 extern void daemonize(const char *, ...);
1875 extern int allow_signal(int);
1876 extern int disallow_signal(int);
1877
1878 extern int do_execve(char *, char __user * __user *, char __user * __user *, struct pt_regs *);
1879 extern long do_fork(unsigned long, unsigned long, struct pt_regs *, unsigned long, int __user *, int __user *);
1880 struct task_struct *fork_idle(int);
1881
1882 extern void set_task_comm(struct task_struct *tsk, char *from);
1883 extern char *get_task_comm(char *to, struct task_struct *tsk);
1884
1885 #ifdef CONFIG_SMP
1886 extern void wait_task_inactive(struct task_struct * p);
1887 #else
1888 #define wait_task_inactive(p)   do { } while (0)
1889 #endif
1890
1891 #define next_task(p)    list_entry(rcu_dereference((p)->tasks.next), struct task_struct, tasks)
1892
1893 #define for_each_process(p) \
1894         for (p = &init_task ; (p = next_task(p)) != &init_task ; )
1895
1896 /*
1897  * Careful: do_each_thread/while_each_thread is a double loop so
1898  *          'break' will not work as expected - use goto instead.
1899  */
1900 #define do_each_thread(g, t) \
1901         for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do
1902
1903 #define while_each_thread(g, t) \
1904         while ((t = next_thread(t)) != g)
1905
1906 /* de_thread depends on thread_group_leader not being a pid based check */
1907 #define thread_group_leader(p)  (p == p->group_leader)
1908
1909 /* Do to the insanities of de_thread it is possible for a process
1910  * to have the pid of the thread group leader without actually being
1911  * the thread group leader.  For iteration through the pids in proc
1912  * all we care about is that we have a task with the appropriate
1913  * pid, we don't actually care if we have the right task.
1914  */
1915 static inline int has_group_leader_pid(struct task_struct *p)
1916 {
1917         return p->pid == p->tgid;
1918 }
1919
1920 static inline
1921 int same_thread_group(struct task_struct *p1, struct task_struct *p2)
1922 {
1923         return p1->tgid == p2->tgid;
1924 }
1925
1926 static inline struct task_struct *next_thread(const struct task_struct *p)
1927 {
1928         return list_entry(rcu_dereference(p->thread_group.next),
1929                           struct task_struct, thread_group);
1930 }
1931
1932 static inline int thread_group_empty(struct task_struct *p)
1933 {
1934         return list_empty(&p->thread_group);
1935 }
1936
1937 #define delay_group_leader(p) \
1938                 (thread_group_leader(p) && !thread_group_empty(p))
1939
1940 /*
1941  * Protects ->fs, ->files, ->mm, ->group_info, ->comm, keyring
1942  * subscriptions and synchronises with wait4().  Also used in procfs.  Also
1943  * pins the final release of task.io_context.  Also protects ->cpuset and
1944  * ->cgroup.subsys[].
1945  *
1946  * Nests both inside and outside of read_lock(&tasklist_lock).
1947  * It must not be nested with write_lock_irq(&tasklist_lock),
1948  * neither inside nor outside.
1949  */
1950 static inline void task_lock(struct task_struct *p)
1951 {
1952         spin_lock(&p->alloc_lock);
1953 }
1954
1955 static inline void task_unlock(struct task_struct *p)
1956 {
1957         spin_unlock(&p->alloc_lock);
1958 }
1959
1960 extern struct sighand_struct *lock_task_sighand(struct task_struct *tsk,
1961                                                         unsigned long *flags);
1962
1963 static inline void unlock_task_sighand(struct task_struct *tsk,
1964                                                 unsigned long *flags)
1965 {
1966         spin_unlock_irqrestore(&tsk->sighand->siglock, *flags);
1967 }
1968
1969 #ifndef __HAVE_THREAD_FUNCTIONS
1970
1971 #define task_thread_info(task)  ((struct thread_info *)(task)->stack)
1972 #define task_stack_page(task)   ((task)->stack)
1973
1974 static inline void setup_thread_stack(struct task_struct *p, struct task_struct *org)
1975 {
1976         *task_thread_info(p) = *task_thread_info(org);
1977         task_thread_info(p)->task = p;
1978 }
1979
1980 static inline unsigned long *end_of_stack(struct task_struct *p)
1981 {
1982         return (unsigned long *)(task_thread_info(p) + 1);
1983 }
1984
1985 #endif
1986
1987 static inline int object_is_on_stack(void *obj)
1988 {
1989         void *stack = task_stack_page(current);
1990
1991         return (obj >= stack) && (obj < (stack + THREAD_SIZE));
1992 }
1993
1994 extern void thread_info_cache_init(void);
1995
1996 /* set thread flags in other task's structures
1997  * - see asm/thread_info.h for TIF_xxxx flags available
1998  */
1999 static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag)
2000 {
2001         set_ti_thread_flag(task_thread_info(tsk), flag);
2002 }
2003
2004 static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag)
2005 {
2006         clear_ti_thread_flag(task_thread_info(tsk), flag);
2007 }
2008
2009 static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag)
2010 {
2011         return test_and_set_ti_thread_flag(task_thread_info(tsk), flag);
2012 }
2013
2014 static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag)
2015 {
2016         return test_and_clear_ti_thread_flag(task_thread_info(tsk), flag);
2017 }
2018
2019 static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag)
2020 {
2021         return test_ti_thread_flag(task_thread_info(tsk), flag);
2022 }
2023
2024 static inline void set_tsk_need_resched(struct task_struct *tsk)
2025 {
2026         set_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
2027 }
2028
2029 static inline void clear_tsk_need_resched(struct task_struct *tsk)
2030 {
2031         clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
2032 }
2033
2034 static inline int test_tsk_need_resched(struct task_struct *tsk)
2035 {
2036         return unlikely(test_tsk_thread_flag(tsk,TIF_NEED_RESCHED));
2037 }
2038
2039 static inline int signal_pending(struct task_struct *p)
2040 {
2041         return unlikely(test_tsk_thread_flag(p,TIF_SIGPENDING));
2042 }
2043
2044 extern int __fatal_signal_pending(struct task_struct *p);
2045
2046 static inline int fatal_signal_pending(struct task_struct *p)
2047 {
2048         return signal_pending(p) && __fatal_signal_pending(p);
2049 }
2050
2051 static inline int signal_pending_state(long state, struct task_struct *p)
2052 {
2053         if (!(state & (TASK_INTERRUPTIBLE | TASK_WAKEKILL)))
2054                 return 0;
2055         if (!signal_pending(p))
2056                 return 0;
2057
2058         return (state & TASK_INTERRUPTIBLE) || __fatal_signal_pending(p);
2059 }
2060
2061 static inline int need_resched(void)
2062 {
2063         return unlikely(test_thread_flag(TIF_NEED_RESCHED));
2064 }
2065
2066 /*
2067  * cond_resched() and cond_resched_lock(): latency reduction via
2068  * explicit rescheduling in places that are safe. The return
2069  * value indicates whether a reschedule was done in fact.
2070  * cond_resched_lock() will drop the spinlock before scheduling,
2071  * cond_resched_softirq() will enable bhs before scheduling.
2072  */
2073 extern int _cond_resched(void);
2074 #ifdef CONFIG_PREEMPT_BKL
2075 static inline int cond_resched(void)
2076 {
2077         return 0;
2078 }
2079 #else
2080 static inline int cond_resched(void)
2081 {
2082         return _cond_resched();
2083 }
2084 #endif
2085 extern int cond_resched_lock(spinlock_t * lock);
2086 extern int cond_resched_softirq(void);
2087 static inline int cond_resched_bkl(void)
2088 {
2089         return _cond_resched();
2090 }
2091
2092 /*
2093  * Does a critical section need to be broken due to another
2094  * task waiting?: (technically does not depend on CONFIG_PREEMPT,
2095  * but a general need for low latency)
2096  */
2097 static inline int spin_needbreak(spinlock_t *lock)
2098 {
2099 #ifdef CONFIG_PREEMPT
2100         return spin_is_contended(lock);
2101 #else
2102         return 0;
2103 #endif
2104 }
2105
2106 /*
2107  * Reevaluate whether the task has signals pending delivery.
2108  * Wake the task if so.
2109  * This is required every time the blocked sigset_t changes.
2110  * callers must hold sighand->siglock.
2111  */
2112 extern void recalc_sigpending_and_wake(struct task_struct *t);
2113 extern void recalc_sigpending(void);
2114
2115 extern void signal_wake_up(struct task_struct *t, int resume_stopped);
2116
2117 /*
2118  * Wrappers for p->thread_info->cpu access. No-op on UP.
2119  */
2120 #ifdef CONFIG_SMP
2121
2122 static inline unsigned int task_cpu(const struct task_struct *p)
2123 {
2124         return task_thread_info(p)->cpu;
2125 }
2126
2127 extern void set_task_cpu(struct task_struct *p, unsigned int cpu);
2128
2129 #else
2130
2131 static inline unsigned int task_cpu(const struct task_struct *p)
2132 {
2133         return 0;
2134 }
2135
2136 static inline void set_task_cpu(struct task_struct *p, unsigned int cpu)
2137 {
2138 }
2139
2140 #endif /* CONFIG_SMP */
2141
2142 extern void arch_pick_mmap_layout(struct mm_struct *mm);
2143
2144 #ifdef CONFIG_TRACING
2145 extern void
2146 __trace_special(void *__tr, void *__data,
2147                 unsigned long arg1, unsigned long arg2, unsigned long arg3);
2148 #else
2149 static inline void
2150 __trace_special(void *__tr, void *__data,
2151                 unsigned long arg1, unsigned long arg2, unsigned long arg3)
2152 {
2153 }
2154 #endif
2155
2156 extern long sched_setaffinity(pid_t pid, const cpumask_t *new_mask);
2157 extern long sched_getaffinity(pid_t pid, cpumask_t *mask);
2158
2159 extern int sched_mc_power_savings, sched_smt_power_savings;
2160
2161 extern void normalize_rt_tasks(void);
2162
2163 #ifdef CONFIG_GROUP_SCHED
2164
2165 extern struct task_group init_task_group;
2166 #ifdef CONFIG_USER_SCHED
2167 extern struct task_group root_task_group;
2168 #endif
2169
2170 extern struct task_group *sched_create_group(struct task_group *parent);
2171 extern void sched_destroy_group(struct task_group *tg);
2172 extern void sched_move_task(struct task_struct *tsk);
2173 #ifdef CONFIG_FAIR_GROUP_SCHED
2174 extern int sched_group_set_shares(struct task_group *tg, unsigned long shares);
2175 extern unsigned long sched_group_shares(struct task_group *tg);
2176 #endif
2177 #ifdef CONFIG_RT_GROUP_SCHED
2178 extern int sched_group_set_rt_runtime(struct task_group *tg,
2179                                       long rt_runtime_us);
2180 extern long sched_group_rt_runtime(struct task_group *tg);
2181 extern int sched_group_set_rt_period(struct task_group *tg,
2182                                       long rt_period_us);
2183 extern long sched_group_rt_period(struct task_group *tg);
2184 #endif
2185 #endif
2186
2187 #ifdef CONFIG_TASK_XACCT
2188 static inline void add_rchar(struct task_struct *tsk, ssize_t amt)
2189 {
2190         tsk->rchar += amt;
2191 }
2192
2193 static inline void add_wchar(struct task_struct *tsk, ssize_t amt)
2194 {
2195         tsk->wchar += amt;
2196 }
2197
2198 static inline void inc_syscr(struct task_struct *tsk)
2199 {
2200         tsk->syscr++;
2201 }
2202
2203 static inline void inc_syscw(struct task_struct *tsk)
2204 {
2205         tsk->syscw++;
2206 }
2207 #else
2208 static inline void add_rchar(struct task_struct *tsk, ssize_t amt)
2209 {
2210 }
2211
2212 static inline void add_wchar(struct task_struct *tsk, ssize_t amt)
2213 {
2214 }
2215
2216 static inline void inc_syscr(struct task_struct *tsk)
2217 {
2218 }
2219
2220 static inline void inc_syscw(struct task_struct *tsk)
2221 {
2222 }
2223 #endif
2224
2225 #ifdef CONFIG_SMP
2226 void migration_init(void);
2227 #else
2228 static inline void migration_init(void)
2229 {
2230 }
2231 #endif
2232
2233 #ifndef TASK_SIZE_OF
2234 #define TASK_SIZE_OF(tsk)       TASK_SIZE
2235 #endif
2236
2237 #ifdef CONFIG_MM_OWNER
2238 extern void mm_update_next_owner(struct mm_struct *mm);
2239 extern void mm_init_owner(struct mm_struct *mm, struct task_struct *p);
2240 #else
2241 static inline void mm_update_next_owner(struct mm_struct *mm)
2242 {
2243 }
2244
2245 static inline void mm_init_owner(struct mm_struct *mm, struct task_struct *p)
2246 {
2247 }
2248 #endif /* CONFIG_MM_OWNER */
2249
2250 #define TASK_STATE_TO_CHAR_STR "RSDTtZX"
2251
2252 #endif /* __KERNEL__ */
2253
2254 #endif