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