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