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