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