include/linux/sched.h

   1 #ifndef _LINUX_SCHED_H
   2 #define _LINUX_SCHED_H
   3
   4 /*
   5  * cloning flags:
   6  */
   7 #define CSIGNAL         0x000000ff      /* signal mask to be sent at exit */
   8 #define CLONE_VM        0x00000100      /* set if VM shared between processes */
   9 #define CLONE_FS        0x00000200      /* set if fs info shared between processes */
  10 #define CLONE_FILES     0x00000400      /* set if open files shared between processes */
  11 #define CLONE_SIGHAND   0x00000800      /* set if signal handlers and blocked signals shared */
  12 #define CLONE_PTRACE    0x00002000      /* set if we want to let tracing continue on the child too */
  13 #define CLONE_VFORK     0x00004000      /* set if the parent wants the child to wake it up on mm_release */
  14 #define CLONE_PARENT    0x00008000      /* set if we want to have the same parent as the cloner */
  15 #define CLONE_THREAD    0x00010000      /* Same thread group? */
  16 #define CLONE_NEWNS     0x00020000      /* New namespace group? */
  17 #define CLONE_SYSVSEM   0x00040000      /* share system V SEM_UNDO semantics */
  18 #define CLONE_SETTLS    0x00080000      /* create a new TLS for the child */
  19 #define CLONE_PARENT_SETTID     0x00100000      /* set the TID in the parent */
  20 #define CLONE_CHILD_CLEARTID    0x00200000      /* clear the TID in the child */
  21 #define CLONE_DETACHED          0x00400000      /* Unused, ignored */
  22 #define CLONE_UNTRACED          0x00800000      /* set if the tracing process can't force CLONE_PTRACE on this clone */
  23 #define CLONE_CHILD_SETTID      0x01000000      /* set the TID in the child */
  24 #define CLONE_STOPPED           0x02000000      /* Start in stopped state */
  25 #define CLONE_NEWUTS            0x04000000      /* New utsname group? */
  26 #define CLONE_NEWIPC            0x08000000      /* New ipcs */
  27 #define CLONE_NEWUSER           0x10000000      /* New user namespace */
  28 #define CLONE_NEWPID            0x20000000      /* New pid namespace */
  29 #define CLONE_NEWNET            0x40000000      /* New network namespace */
  30 #define CLONE_IO                0x80000000      /* Clone io context */
  31
  32 /*
  33  * Scheduling policies
  34  */
  35 #define SCHED_NORMAL            0
  36 #define SCHED_FIFO              1
  37 #define SCHED_RR                2
  38 #define SCHED_BATCH             3
  39 /* SCHED_ISO: reserved but not implemented yet */
  40 #define SCHED_IDLE              5
  41
  42 #ifdef __KERNEL__
  43
  44 struct sched_param {
  45         int sched_priority;
  46 };
  47
  48 #include <asm/param.h>  /* for HZ */
  49
  50 #include <linux/capability.h>
  51 #include <linux/threads.h>
  52 #include <linux/kernel.h>
  53 #include <linux/types.h>
  54 #include <linux/timex.h>
  55 #include <linux/jiffies.h>
  56 #include <linux/rbtree.h>
  57 #include <linux/thread_info.h>
  58 #include <linux/cpumask.h>
  59 #include <linux/errno.h>
  60 #include <linux/nodemask.h>
  61 #include <linux/mm_types.h>
  62
  63 #include <asm/system.h>
  64 #include <asm/page.h>
  65 #include <asm/ptrace.h>
  66 #include <asm/cputime.h>
  67
  68 #include <linux/smp.h>
  69 #include <linux/sem.h>
  70 #include <linux/signal.h>
  71 #include <linux/fs_struct.h>
  72 #include <linux/compiler.h>
  73 #include <linux/completion.h>
  74 #include <linux/pid.h>
  75 #include <linux/percpu.h>
  76 #include <linux/topology.h>
  77 #include <linux/proportions.h>
  78 #include <linux/seccomp.h>
  79 #include <linux/rcupdate.h>
  80 #include <linux/rtmutex.h>
  81
  82 #include <linux/time.h>
  83 #include <linux/param.h>
  84 #include <linux/resource.h>
  85 #include <linux/timer.h>
  86 #include <linux/hrtimer.h>
  87 #include <linux/task_io_accounting.h>
  88 #include <linux/kobject.h>
  89 #include <linux/latencytop.h>
  90 #include <linux/cred.h>
  91
  92 #include <asm/processor.h>
  93
  94 struct mem_cgroup;
  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
 139 struct seq_file;
 140 struct cfs_rq;
 141 struct task_group;
 142 #ifdef CONFIG_SCHED_DEBUG
 143 extern void proc_sched_show_task(struct task_struct *p, struct seq_file *m);
 144 extern void proc_sched_set_task(struct task_struct *p);
 145 extern void
 146 print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq);
 147 #else
 148 static inline void
 149 proc_sched_show_task(struct task_struct *p, struct seq_file *m)
 150 {
 151 }
 152 static inline void proc_sched_set_task(struct task_struct *p)
 153 {
 154 }
 155 static inline void
 156 print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)
 157 {
 158 }
 159 #endif
 160
 161 extern unsigned long long time_sync_thresh;
 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 int runqueue_is_locked(void);
 250
 251 extern cpumask_t nohz_cpu_mask;
 252 #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ)
 253 extern int select_nohz_load_balancer(int cpu);
 254 #else
 255 static inline int select_nohz_load_balancer(int cpu)
 256 {
 257         return 0;
 258 }
 259 #endif
 260
 261 extern unsigned long rt_needs_cpu(int cpu);
 262
 263 /*
 264  * Only dump TASK_* tasks. (0 for all tasks)
 265  */
 266 extern void show_state_filter(unsigned long state_filter);
 267
 268 static inline void show_state(void)
 269 {
 270         show_state_filter(0);
 271 }
 272
 273 extern void show_regs(struct pt_regs *);
 274
 275 /*
 276  * TASK is a pointer to the task whose backtrace we want to see (or NULL for current
 277  * task), SP is the stack pointer of the first frame that should be shown in the back
 278  * trace (or NULL if the entire call-chain of the task should be shown).
 279  */
 280 extern void show_stack(struct task_struct *task, unsigned long *sp);
 281
 282 void io_schedule(void);
 283 long io_schedule_timeout(long timeout);
 284
 285 extern void cpu_init (void);
 286 extern void trap_init(void);
 287 extern void account_process_tick(struct task_struct *task, int user);
 288 extern void update_process_times(int user);
 289 extern void scheduler_tick(void);
 290 extern void hrtick_resched(void);
 291
 292 extern void sched_show_task(struct task_struct *p);
 293
 294 #ifdef CONFIG_DETECT_SOFTLOCKUP
 295 extern void softlockup_tick(void);
 296 extern void touch_softlockup_watchdog(void);
 297 extern void touch_all_softlockup_watchdogs(void);
 298 extern unsigned int  softlockup_panic;
 299 extern unsigned long sysctl_hung_task_check_count;
 300 extern unsigned long sysctl_hung_task_timeout_secs;
 301 extern unsigned long sysctl_hung_task_warnings;
 302 extern int softlockup_thresh;
 303 #else
 304 static inline void softlockup_tick(void)
 305 {
 306 }
 307 static inline void spawn_softlockup_task(void)
 308 {
 309 }
 310 static inline void touch_softlockup_watchdog(void)
 311 {
 312 }
 313 static inline void touch_all_softlockup_watchdogs(void)
 314 {
 315 }
 316 #endif
 317
 318
 319 /* Attach to any functions which should be ignored in wchan output. */
 320 #define __sched         __attribute__((__section__(".sched.text")))
 321
 322 /* Linker adds these: start and end of __sched functions */
 323 extern char __sched_text_start[], __sched_text_end[];
 324
 325 /* Is this address in the __sched functions? */
 326 extern int in_sched_functions(unsigned long addr);
 327
 328 #define MAX_SCHEDULE_TIMEOUT    LONG_MAX
 329 extern signed long schedule_timeout(signed long timeout);
 330 extern signed long schedule_timeout_interruptible(signed long timeout);
 331 extern signed long schedule_timeout_killable(signed long timeout);
 332 extern signed long schedule_timeout_uninterruptible(signed long timeout);
 333 asmlinkage void schedule(void);
 334
 335 struct nsproxy;
 336 struct user_namespace;
 337
 338 /* Maximum number of active map areas.. This is a random (large) number */
 339 #define DEFAULT_MAX_MAP_COUNT   65536
 340
 341 extern int sysctl_max_map_count;
 342
 343 #include <linux/aio.h>
 344
 345 extern unsigned long
 346 arch_get_unmapped_area(struct file *, unsigned long, unsigned long,
 347                        unsigned long, unsigned long);
 348 extern unsigned long
 349 arch_get_unmapped_area_topdown(struct file *filp, unsigned long addr,
 350                           unsigned long len, unsigned long pgoff,
 351                           unsigned long flags);
 352 extern void arch_unmap_area(struct mm_struct *, unsigned long);
 353 extern void arch_unmap_area_topdown(struct mm_struct *, unsigned long);
 354
 355 #if NR_CPUS >= CONFIG_SPLIT_PTLOCK_CPUS
 356 /*
 357  * The mm counters are not protected by its page_table_lock,
 358  * so must be incremented atomically.
 359  */
 360 #define set_mm_counter(mm, member, value) atomic_long_set(&(mm)->_##member, value)
 361 #define get_mm_counter(mm, member) ((unsigned long)atomic_long_read(&(mm)->_##member))
 362 #define add_mm_counter(mm, member, value) atomic_long_add(value, &(mm)->_##member)
 363 #define inc_mm_counter(mm, member) atomic_long_inc(&(mm)->_##member)
 364 #define dec_mm_counter(mm, member) atomic_long_dec(&(mm)->_##member)
 365
 366 #else  /* NR_CPUS < CONFIG_SPLIT_PTLOCK_CPUS */
 367 /*
 368  * The mm counters are protected by its page_table_lock,
 369  * so can be incremented directly.
 370  */
 371 #define set_mm_counter(mm, member, value) (mm)->_##member = (value)
 372 #define get_mm_counter(mm, member) ((mm)->_##member)
 373 #define add_mm_counter(mm, member, value) (mm)->_##member += (value)
 374 #define inc_mm_counter(mm, member) (mm)->_##member++
 375 #define dec_mm_counter(mm, member) (mm)->_##member--
 376
 377 #endif /* NR_CPUS < CONFIG_SPLIT_PTLOCK_CPUS */
 378
 379 #define get_mm_rss(mm)                                  \
 380         (get_mm_counter(mm, file_rss) + get_mm_counter(mm, anon_rss))
 381 #define update_hiwater_rss(mm)  do {                    \
 382         unsigned long _rss = get_mm_rss(mm);            \
 383         if ((mm)->hiwater_rss < _rss)                   \
 384                 (mm)->hiwater_rss = _rss;               \
 385 } while (0)
 386 #define update_hiwater_vm(mm)   do {                    \
 387         if ((mm)->hiwater_vm < (mm)->total_vm)          \
 388                 (mm)->hiwater_vm = (mm)->total_vm;      \
 389 } while (0)
 390
 391 extern void set_dumpable(struct mm_struct *mm, int value);
 392 extern int get_dumpable(struct mm_struct *mm);
 393
 394 /* mm flags */
 395 /* dumpable bits */
 396 #define MMF_DUMPABLE      0  /* core dump is permitted */
 397 #define MMF_DUMP_SECURELY 1  /* core file is readable only by root */
 398 #define MMF_DUMPABLE_BITS 2
 399
 400 /* coredump filter bits */
 401 #define MMF_DUMP_ANON_PRIVATE   2
 402 #define MMF_DUMP_ANON_SHARED    3
 403 #define MMF_DUMP_MAPPED_PRIVATE 4
 404 #define MMF_DUMP_MAPPED_SHARED  5
 405 #define MMF_DUMP_ELF_HEADERS    6
 406 #define MMF_DUMP_FILTER_SHIFT   MMF_DUMPABLE_BITS
 407 #define MMF_DUMP_FILTER_BITS    5
 408 #define MMF_DUMP_FILTER_MASK \
 409         (((1 << MMF_DUMP_FILTER_BITS) - 1) << MMF_DUMP_FILTER_SHIFT)
 410 #define MMF_DUMP_FILTER_DEFAULT \
 411         ((1 << MMF_DUMP_ANON_PRIVATE) | (1 << MMF_DUMP_ANON_SHARED))
 412
 413 struct sighand_struct {
 414         atomic_t                count;
 415         struct k_sigaction      action[_NSIG];
 416         spinlock_t              siglock;
 417         wait_queue_head_t       signalfd_wqh;
 418 };
 419
 420 struct pacct_struct {
 421         int                     ac_flag;
 422         long                    ac_exitcode;
 423         unsigned long           ac_mem;
 424         cputime_t               ac_utime, ac_stime;
 425         unsigned long           ac_minflt, ac_majflt;
 426 };
 427
 428 /*
 429  * NOTE! "signal_struct" does not have it's own
 430  * locking, because a shared signal_struct always
 431  * implies a shared sighand_struct, so locking
 432  * sighand_struct is always a proper superset of
 433  * the locking of signal_struct.
 434  */
 435 struct signal_struct {
 436         atomic_t                count;
 437         atomic_t                live;
 438
 439         wait_queue_head_t       wait_chldexit;  /* for wait4() */
 440
 441         /* current thread group signal load-balancing target: */
 442         struct task_struct      *curr_target;
 443
 444         /* shared signal handling: */
 445         struct sigpending       shared_pending;
 446
 447         /* thread group exit support */
 448         int                     group_exit_code;
 449         /* overloaded:
 450          * - notify group_exit_task when ->count is equal to notify_count
 451          * - everyone except group_exit_task is stopped during signal delivery
 452          *   of fatal signals, group_exit_task processes the signal.
 453          */
 454         struct task_struct      *group_exit_task;
 455         int                     notify_count;
 456
 457         /* thread group stop support, overloads group_exit_code too */
 458         int                     group_stop_count;
 459         unsigned int            flags; /* see SIGNAL_* flags below */
 460
 461         /* POSIX.1b Interval Timers */
 462         struct list_head posix_timers;
 463
 464         /* ITIMER_REAL timer for the process */
 465         struct hrtimer real_timer;
 466         struct pid *leader_pid;
 467         ktime_t it_real_incr;
 468
 469         /* ITIMER_PROF and ITIMER_VIRTUAL timers for the process */
 470         cputime_t it_prof_expires, it_virt_expires;
 471         cputime_t it_prof_incr, it_virt_incr;
 472
 473         /* job control IDs */
 474
 475         /*
 476          * pgrp and session fields are deprecated.
 477          * use the task_session_Xnr and task_pgrp_Xnr routines below
 478          */
 479
 480         union {
 481                 pid_t pgrp __deprecated;
 482                 pid_t __pgrp;
 483         };
 484
 485         struct pid *tty_old_pgrp;
 486
 487         union {
 488                 pid_t session __deprecated;
 489                 pid_t __session;
 490         };
 491
 492         /* boolean value for session group leader */
 493         int leader;
 494
 495         struct tty_struct *tty; /* NULL if no tty */
 496
 497         /*
 498          * Cumulative resource counters for dead threads in the group,
 499          * and for reaped dead child processes forked by this group.
 500          * Live threads maintain their own counters and add to these
 501          * in __exit_signal, except for the group leader.
 502          */
 503         cputime_t utime, stime, cutime, cstime;
 504         cputime_t gtime;
 505         cputime_t cgtime;
 506         unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw;
 507         unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt;
 508         unsigned long inblock, oublock, cinblock, coublock;
 509         struct task_io_accounting ioac;
 510
 511         /*
 512          * Cumulative ns of scheduled CPU time for dead threads in the
 513          * group, not including a zombie group leader.  (This only differs
 514          * from jiffies_to_ns(utime + stime) if sched_clock uses something
 515          * other than jiffies.)
 516          */
 517         unsigned long long sum_sched_runtime;
 518
 519         /*
 520          * We don't bother to synchronize most readers of this at all,
 521          * because there is no reader checking a limit that actually needs
 522          * to get both rlim_cur and rlim_max atomically, and either one
 523          * alone is a single word that can safely be read normally.
 524          * getrlimit/setrlimit use task_lock(current->group_leader) to
 525          * protect this instead of the siglock, because they really
 526          * have no need to disable irqs.
 527          */
 528         struct rlimit rlim[RLIM_NLIMITS];
 529
 530         struct list_head cpu_timers[3];
 531
 532         /* keep the process-shared keyrings here so that they do the right
 533          * thing in threads created with CLONE_THREAD */
 534 #ifdef CONFIG_KEYS
 535         struct key *session_keyring;    /* keyring inherited over fork */
 536         struct key *process_keyring;    /* keyring private to this process */
 537 #endif
 538 #ifdef CONFIG_BSD_PROCESS_ACCT
 539         struct pacct_struct pacct;      /* per-process accounting information */
 540 #endif
 541 #ifdef CONFIG_TASKSTATS
 542         struct taskstats *stats;
 543 #endif
 544 #ifdef CONFIG_AUDIT
 545         unsigned audit_tty;
 546         struct tty_audit_buf *tty_audit_buf;
 547 #endif
 548 };
 549
 550 /* Context switch must be unlocked if interrupts are to be enabled */
 551 #ifdef __ARCH_WANT_INTERRUPTS_ON_CTXSW
 552 # define __ARCH_WANT_UNLOCKED_CTXSW
 553 #endif
 554
 555 /*
 556  * Bits in flags field of signal_struct.
 557  */
 558 #define SIGNAL_STOP_STOPPED     0x00000001 /* job control stop in effect */
 559 #define SIGNAL_STOP_DEQUEUED    0x00000002 /* stop signal dequeued */
 560 #define SIGNAL_STOP_CONTINUED   0x00000004 /* SIGCONT since WCONTINUED reap */
 561 #define SIGNAL_GROUP_EXIT       0x00000008 /* group exit in progress */
 562 /*
 563  * Pending notifications to parent.
 564  */
 565 #define SIGNAL_CLD_STOPPED      0x00000010
 566 #define SIGNAL_CLD_CONTINUED    0x00000020
 567 #define SIGNAL_CLD_MASK         (SIGNAL_CLD_STOPPED|SIGNAL_CLD_CONTINUED)
 568
 569 #define SIGNAL_UNKILLABLE       0x00000040 /* for init: ignore fatal signals */
 570
 571 /* If true, all threads except ->group_exit_task have pending SIGKILL */
 572 static inline int signal_group_exit(const struct signal_struct *sig)
 573 {
 574         return  (sig->flags & SIGNAL_GROUP_EXIT) ||
 575                 (sig->group_exit_task != NULL);
 576 }
 577
 578 /*
 579  * Some day this will be a full-fledged user tracking system..
 580  */
 581 struct user_struct {
 582         atomic_t __count;       /* reference count */
 583         atomic_t processes;     /* How many processes does this user have? */
 584         atomic_t files;         /* How many open files does this user have? */
 585         atomic_t sigpending;    /* How many pending signals does this user have? */
 586 #ifdef CONFIG_INOTIFY_USER
 587         atomic_t inotify_watches; /* How many inotify watches does this user have? */
 588         atomic_t inotify_devs;  /* How many inotify devs does this user have opened? */
 589 #endif
 590 #ifdef CONFIG_POSIX_MQUEUE
 591         /* protected by mq_lock */
 592         unsigned long mq_bytes; /* How many bytes can be allocated to mqueue? */
 593 #endif
 594         unsigned long locked_shm; /* How many pages of mlocked shm ? */
 595
 596 #ifdef CONFIG_KEYS
 597         struct key *uid_keyring;        /* UID specific keyring */
 598         struct key *session_keyring;    /* UID's default session keyring */
 599 #endif
 600
 601         /* Hash table maintenance information */
 602         struct hlist_node uidhash_node;
 603         uid_t uid;
 604
 605 #ifdef CONFIG_USER_SCHED
 606         struct task_group *tg;
 607 #ifdef CONFIG_SYSFS
 608         struct kobject kobj;
 609         struct work_struct work;
 610 #endif
 611 #endif
 612 };
 613
 614 extern int uids_sysfs_init(void);
 615
 616 extern struct user_struct *find_user(uid_t);
 617
 618 extern struct user_struct root_user;
 619 #define INIT_USER (&root_user)
 620
 621 struct backing_dev_info;
 622 struct reclaim_state;
 623
 624 #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
 625 struct sched_info {
 626         /* cumulative counters */
 627         unsigned long pcount;         /* # of times run on this cpu */
 628         unsigned long long cpu_time,  /* time spent on the cpu */
 629                            run_delay; /* time spent waiting on a runqueue */
 630
 631         /* timestamps */
 632         unsigned long long last_arrival,/* when we last ran on a cpu */
 633                            last_queued; /* when we were last queued to run */
 634 #ifdef CONFIG_SCHEDSTATS
 635         /* BKL stats */
 636         unsigned int bkl_count;
 637 #endif
 638 };
 639 #endif /* defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) */
 640
 641 #ifdef CONFIG_SCHEDSTATS
 642 extern const struct file_operations proc_schedstat_operations;
 643 #endif /* CONFIG_SCHEDSTATS */
 644
 645 #ifdef CONFIG_TASK_DELAY_ACCT
 646 struct task_delay_info {
 647         spinlock_t      lock;
 648         unsigned int    flags;  /* Private per-task flags */
 649
 650         /* For each stat XXX, add following, aligned appropriately
 651          *
 652          * struct timespec XXX_start, XXX_end;
 653          * u64 XXX_delay;
 654          * u32 XXX_count;
 655          *
 656          * Atomicity of updates to XXX_delay, XXX_count protected by
 657          * single lock above (split into XXX_lock if contention is an issue).
 658          */
 659
 660         /*
 661          * XXX_count is incremented on every XXX operation, the delay
 662          * associated with the operation is added to XXX_delay.
 663          * XXX_delay contains the accumulated delay time in nanoseconds.
 664          */
 665         struct timespec blkio_start, blkio_end; /* Shared by blkio, swapin */
 666         u64 blkio_delay;        /* wait for sync block io completion */
 667         u64 swapin_delay;       /* wait for swapin block io completion */
 668         u32 blkio_count;        /* total count of the number of sync block */
 669                                 /* io operations performed */
 670         u32 swapin_count;       /* total count of the number of swapin block */
 671                                 /* io operations performed */
 672
 673         struct timespec freepages_start, freepages_end;
 674         u64 freepages_delay;    /* wait for memory reclaim */
 675         u32 freepages_count;    /* total count of memory reclaim */
 676 };
 677 #endif  /* CONFIG_TASK_DELAY_ACCT */
 678
 679 static inline int sched_info_on(void)
 680 {
 681 #ifdef CONFIG_SCHEDSTATS
 682         return 1;
 683 #elif defined(CONFIG_TASK_DELAY_ACCT)
 684         extern int delayacct_on;
 685         return delayacct_on;
 686 #else
 687         return 0;
 688 #endif
 689 }
 690
 691 enum cpu_idle_type {
 692         CPU_IDLE,
 693         CPU_NOT_IDLE,
 694         CPU_NEWLY_IDLE,
 695         CPU_MAX_IDLE_TYPES
 696 };
 697
 698 /*
 699  * sched-domains (multiprocessor balancing) declarations:
 700  */
 701
 702 /*
 703  * Increase resolution of nice-level calculations:
 704  */
 705 #define SCHED_LOAD_SHIFT        10
 706 #define SCHED_LOAD_SCALE        (1L << SCHED_LOAD_SHIFT)
 707
 708 #define SCHED_LOAD_SCALE_FUZZ   SCHED_LOAD_SCALE
 709
 710 #ifdef CONFIG_SMP
 711 #define SD_LOAD_BALANCE         1       /* Do load balancing on this domain. */
 712 #define SD_BALANCE_NEWIDLE      2       /* Balance when about to become idle */
 713 #define SD_BALANCE_EXEC         4       /* Balance on exec */
 714 #define SD_BALANCE_FORK         8       /* Balance on fork, clone */
 715 #define SD_WAKE_IDLE            16      /* Wake to idle CPU on task wakeup */
 716 #define SD_WAKE_AFFINE          32      /* Wake task to waking CPU */
 717 #define SD_WAKE_BALANCE         64      /* Perform balancing at task wakeup */
 718 #define SD_SHARE_CPUPOWER       128     /* Domain members share cpu power */
 719 #define SD_POWERSAVINGS_BALANCE 256     /* Balance for power savings */
 720 #define SD_SHARE_PKG_RESOURCES  512     /* Domain members share cpu pkg resources */
 721 #define SD_SERIALIZE            1024    /* Only a single load balancing instance */
 722 #define SD_WAKE_IDLE_FAR        2048    /* Gain latency sacrificing cache hit */
 723
 724 #define BALANCE_FOR_MC_POWER    \
 725         (sched_smt_power_savings ? SD_POWERSAVINGS_BALANCE : 0)
 726
 727 #define BALANCE_FOR_PKG_POWER   \
 728         ((sched_mc_power_savings || sched_smt_power_savings) ?  \
 729          SD_POWERSAVINGS_BALANCE : 0)
 730
 731 #define test_sd_parent(sd, flag)        ((sd->parent &&         \
 732                                          (sd->parent->flags & flag)) ? 1 : 0)
 733
 734
 735 struct sched_group {
 736         struct sched_group *next;       /* Must be a circular list */
 737         cpumask_t cpumask;
 738
 739         /*
 740          * CPU power of this group, SCHED_LOAD_SCALE being max power for a
 741          * single CPU. This is read only (except for setup, hotplug CPU).
 742          * Note : Never change cpu_power without recompute its reciprocal
 743          */
 744         unsigned int __cpu_power;
 745         /*
 746          * reciprocal value of cpu_power to avoid expensive divides
 747          * (see include/linux/reciprocal_div.h)
 748          */
 749         u32 reciprocal_cpu_power;
 750 };
 751
 752 enum sched_domain_level {
 753         SD_LV_NONE = 0,
 754         SD_LV_SIBLING,
 755         SD_LV_MC,
 756         SD_LV_CPU,
 757         SD_LV_NODE,
 758         SD_LV_ALLNODES,
 759         SD_LV_MAX
 760 };
 761
 762 struct sched_domain_attr {
 763         int relax_domain_level;
 764 };
 765
 766 #define SD_ATTR_INIT    (struct sched_domain_attr) {    \
 767         .relax_domain_level = -1,                       \
 768 }
 769
 770 struct sched_domain {
 771         /* These fields must be setup */
 772         struct sched_domain *parent;    /* top domain must be null terminated */
 773         struct sched_domain *child;     /* bottom domain must be null terminated */
 774         struct sched_group *groups;     /* the balancing groups of the domain */
 775         cpumask_t span;                 /* span of all CPUs in this domain */
 776         unsigned long min_interval;     /* Minimum balance interval ms */
 777         unsigned long max_interval;     /* Maximum balance interval ms */
 778         unsigned int busy_factor;       /* less balancing by factor if busy */
 779         unsigned int imbalance_pct;     /* No balance until over watermark */
 780         unsigned int cache_nice_tries;  /* Leave cache hot tasks for # tries */
 781         unsigned int busy_idx;
 782         unsigned int idle_idx;
 783         unsigned int newidle_idx;
 784         unsigned int wake_idx;
 785         unsigned int forkexec_idx;
 786         int flags;                      /* See SD_* */
 787         enum sched_domain_level level;
 788
 789         /* Runtime fields. */
 790         unsigned long last_balance;     /* init to jiffies. units in jiffies */
 791         unsigned int balance_interval;  /* initialise to 1. units in ms. */
 792         unsigned int nr_balance_failed; /* initialise to 0 */
 793
 794         u64 last_update;
 795
 796 #ifdef CONFIG_SCHEDSTATS
 797         /* load_balance() stats */
 798         unsigned int lb_count[CPU_MAX_IDLE_TYPES];
 799         unsigned int lb_failed[CPU_MAX_IDLE_TYPES];
 800         unsigned int lb_balanced[CPU_MAX_IDLE_TYPES];
 801         unsigned int lb_imbalance[CPU_MAX_IDLE_TYPES];
 802         unsigned int lb_gained[CPU_MAX_IDLE_TYPES];
 803         unsigned int lb_hot_gained[CPU_MAX_IDLE_TYPES];
 804         unsigned int lb_nobusyg[CPU_MAX_IDLE_TYPES];
 805         unsigned int lb_nobusyq[CPU_MAX_IDLE_TYPES];
 806
 807         /* Active load balancing */
 808         unsigned int alb_count;
 809         unsigned int alb_failed;
 810         unsigned int alb_pushed;
 811
 812         /* SD_BALANCE_EXEC stats */
 813         unsigned int sbe_count;
 814         unsigned int sbe_balanced;
 815         unsigned int sbe_pushed;
 816
 817         /* SD_BALANCE_FORK stats */
 818         unsigned int sbf_count;
 819         unsigned int sbf_balanced;
 820         unsigned int sbf_pushed;
 821
 822         /* try_to_wake_up() stats */
 823         unsigned int ttwu_wake_remote;
 824         unsigned int ttwu_move_affine;
 825         unsigned int ttwu_move_balance;
 826 #endif
 827 };
 828
 829 extern void partition_sched_domains(int ndoms_new, cpumask_t *doms_new,
 830                                     struct sched_domain_attr *dattr_new);
 831 extern int arch_reinit_sched_domains(void);
 832
 833 #else /* CONFIG_SMP */
 834
 835 struct sched_domain_attr;
 836
 837 static inline void
 838 partition_sched_domains(int ndoms_new, cpumask_t *doms_new,
 839                         struct sched_domain_attr *dattr_new)
 840 {
 841 }
 842 #endif  /* !CONFIG_SMP */
 843
 844 struct io_context;                      /* See blkdev.h */
 845 #define NGROUPS_SMALL           32
 846 #define NGROUPS_PER_BLOCK       ((unsigned int)(PAGE_SIZE / sizeof(gid_t)))
 847 struct group_info {
 848         int ngroups;
 849         atomic_t usage;
 850         gid_t small_block[NGROUPS_SMALL];
 851         int nblocks;
 852         gid_t *blocks[0];
 853 };
 854
 855 /*
 856  * get_group_info() must be called with the owning task locked (via task_lock())
 857  * when task != current.  The reason being that the vast majority of callers are
 858  * looking at current->group_info, which can not be changed except by the
 859  * current task.  Changing current->group_info requires the task lock, too.
 860  */
 861 #define get_group_info(group_info) do { \
 862         atomic_inc(&(group_info)->usage); \
 863 } while (0)
 864
 865 #define put_group_info(group_info) do { \
 866         if (atomic_dec_and_test(&(group_info)->usage)) \
 867                 groups_free(group_info); \
 868 } while (0)
 869
 870 extern struct group_info *groups_alloc(int gidsetsize);
 871 extern void groups_free(struct group_info *group_info);
 872 extern int set_current_groups(struct group_info *group_info);
 873 extern int groups_search(struct group_info *group_info, gid_t grp);
 874 /* access the groups "array" with this macro */
 875 #define GROUP_AT(gi, i) \
 876     ((gi)->blocks[(i)/NGROUPS_PER_BLOCK][(i)%NGROUPS_PER_BLOCK])
 877
 878 #ifdef ARCH_HAS_PREFETCH_SWITCH_STACK
 879 extern void prefetch_stack(struct task_struct *t);
 880 #else
 881 static inline void prefetch_stack(struct task_struct *t) { }
 882 #endif
 883
 884 struct audit_context;           /* See audit.c */
 885 struct mempolicy;
 886 struct pipe_inode_info;
 887 struct uts_namespace;
 888
 889 struct rq;
 890 struct sched_domain;
 891
 892 struct sched_class {
 893         const struct sched_class *next;
 894
 895         void (*enqueue_task) (struct rq *rq, struct task_struct *p, int wakeup);
 896         void (*dequeue_task) (struct rq *rq, struct task_struct *p, int sleep);
 897         void (*yield_task) (struct rq *rq);
 898         int  (*select_task_rq)(struct task_struct *p, int sync);
 899
 900         void (*check_preempt_curr) (struct rq *rq, struct task_struct *p);
 901
 902         struct task_struct * (*pick_next_task) (struct rq *rq);
 903         void (*put_prev_task) (struct rq *rq, struct task_struct *p);
 904
 905 #ifdef CONFIG_SMP
 906         unsigned long (*load_balance) (struct rq *this_rq, int this_cpu,
 907                         struct rq *busiest, unsigned long max_load_move,
 908                         struct sched_domain *sd, enum cpu_idle_type idle,
 909                         int *all_pinned, int *this_best_prio);
 910
 911         int (*move_one_task) (struct rq *this_rq, int this_cpu,
 912                               struct rq *busiest, struct sched_domain *sd,
 913                               enum cpu_idle_type idle);
 914         void (*pre_schedule) (struct rq *this_rq, struct task_struct *task);
 915         void (*post_schedule) (struct rq *this_rq);
 916         void (*task_wake_up) (struct rq *this_rq, struct task_struct *task);
 917 #endif
 918
 919         void (*set_curr_task) (struct rq *rq);
 920         void (*task_tick) (struct rq *rq, struct task_struct *p, int queued);
 921         void (*task_new) (struct rq *rq, struct task_struct *p);
 922         void (*set_cpus_allowed)(struct task_struct *p,
 923                                  const cpumask_t *newmask);
 924
 925         void (*rq_online)(struct rq *rq);
 926         void (*rq_offline)(struct rq *rq);
 927
 928         void (*switched_from) (struct rq *this_rq, struct task_struct *task,
 929                                int running);
 930         void (*switched_to) (struct rq *this_rq, struct task_struct *task,
 931                              int running);
 932         void (*prio_changed) (struct rq *this_rq, struct task_struct *task,
 933                              int oldprio, int running);
 934
 935 #ifdef CONFIG_FAIR_GROUP_SCHED
 936         void (*moved_group) (struct task_struct *p);
 937 #endif
 938 };
 939
 940 struct load_weight {
 941         unsigned long weight, inv_weight;
 942 };
 943
 944 /*
 945  * CFS stats for a schedulable entity (task, task-group etc)
 946  *
 947  * Current field usage histogram:
 948  *
 949  *     4 se->block_start
 950  *     4 se->run_node
 951  *     4 se->sleep_start
 952  *     6 se->load.weight
 953  */
 954 struct sched_entity {
 955         struct load_weight      load;           /* for load-balancing */
 956         struct rb_node          run_node;
 957         struct list_head        group_node;
 958         unsigned int            on_rq;
 959
 960         u64                     exec_start;
 961         u64                     sum_exec_runtime;
 962         u64                     vruntime;
 963         u64                     prev_sum_exec_runtime;
 964
 965         u64                     last_wakeup;
 966         u64                     avg_overlap;
 967
 968 #ifdef CONFIG_SCHEDSTATS
 969         u64                     wait_start;
 970         u64                     wait_max;
 971         u64                     wait_count;
 972         u64                     wait_sum;
 973
 974         u64                     sleep_start;
 975         u64                     sleep_max;
 976         s64                     sum_sleep_runtime;
 977
 978         u64                     block_start;
 979         u64                     block_max;
 980         u64                     exec_max;
 981         u64                     slice_max;
 982
 983         u64                     nr_migrations;
 984         u64                     nr_migrations_cold;
 985         u64                     nr_failed_migrations_affine;
 986         u64                     nr_failed_migrations_running;
 987         u64                     nr_failed_migrations_hot;
 988         u64                     nr_forced_migrations;
 989         u64                     nr_forced2_migrations;
 990
 991         u64                     nr_wakeups;
 992         u64                     nr_wakeups_sync;
 993         u64                     nr_wakeups_migrate;
 994         u64                     nr_wakeups_local;
 995         u64                     nr_wakeups_remote;
 996         u64                     nr_wakeups_affine;
 997         u64                     nr_wakeups_affine_attempts;
 998         u64                     nr_wakeups_passive;
 999         u64                     nr_wakeups_idle;
1000 #endif
1001
1002 #ifdef CONFIG_FAIR_GROUP_SCHED
1003         struct sched_entity     *parent;
1004         /* rq on which this entity is (to be) queued: */
1005         struct cfs_rq           *cfs_rq;
1006         /* rq "owned" by this entity/group: */
1007         struct cfs_rq           *my_q;
1008 #endif
1009 };
1010
1011 struct sched_rt_entity {
1012         struct list_head run_list;
1013         unsigned int time_slice;
1014         unsigned long timeout;
1015         int nr_cpus_allowed;
1016
1017         struct sched_rt_entity *back;
1018 #ifdef CONFIG_RT_GROUP_SCHED
1019         struct sched_rt_entity  *parent;
1020         /* rq on which this entity is (to be) queued: */
1021         struct rt_rq            *rt_rq;
1022         /* rq "owned" by this entity/group: */
1023         struct rt_rq            *my_q;
1024 #endif
1025 };
1026
1027 struct task_struct {
1028         volatile long state;    /* -1 unrunnable, 0 runnable, >0 stopped */
1029         void *stack;
1030         atomic_t usage;
1031         unsigned int flags;     /* per process flags, defined below */
1032         unsigned int ptrace;
1033
1034         int lock_depth;         /* BKL lock depth */
1035
1036 #ifdef CONFIG_SMP
1037 #ifdef __ARCH_WANT_UNLOCKED_CTXSW
1038         int oncpu;
1039 #endif
1040 #endif
1041
1042         int prio, static_prio, normal_prio;
1043         unsigned int rt_priority;
1044         const struct sched_class *sched_class;
1045         struct sched_entity se;
1046         struct sched_rt_entity rt;
1047
1048 #ifdef CONFIG_PREEMPT_NOTIFIERS
1049         /* list of struct preempt_notifier: */
1050         struct hlist_head preempt_notifiers;
1051 #endif
1052
1053         /*
1054          * fpu_counter contains the number of consecutive context switches
1055          * that the FPU is used. If this is over a threshold, the lazy fpu
1056          * saving becomes unlazy to save the trap. This is an unsigned char
1057          * so that after 256 times the counter wraps and the behavior turns
1058          * lazy again; this to deal with bursty apps that only use FPU for
1059          * a short time
1060          */
1061         unsigned char fpu_counter;
1062         s8 oomkilladj; /* OOM kill score adjustment (bit shift). */
1063 #ifdef CONFIG_BLK_DEV_IO_TRACE
1064         unsigned int btrace_seq;
1065 #endif
1066
1067         unsigned int policy;
1068         cpumask_t cpus_allowed;
1069
1070 #ifdef CONFIG_PREEMPT_RCU
1071         int rcu_read_lock_nesting;
1072         int rcu_flipctr_idx;
1073 #endif /* #ifdef CONFIG_PREEMPT_RCU */
1074
1075 #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
1076         struct sched_info sched_info;
1077 #endif
1078
1079         struct list_head tasks;
1080
1081         struct mm_struct *mm, *active_mm;
1082
1083 /* task state */
1084         struct linux_binfmt *binfmt;
1085         int exit_state;
1086         int exit_code, exit_signal;
1087         int pdeath_signal;  /*  The signal sent when the parent dies  */
1088         /* ??? */
1089         unsigned int personality;
1090         unsigned did_exec:1;
1091         pid_t pid;
1092         pid_t tgid;
1093
1094 #ifdef CONFIG_CC_STACKPROTECTOR
1095         /* Canary value for the -fstack-protector gcc feature */
1096         unsigned long stack_canary;
1097 #endif
1098         /*
1099          * pointers to (original) parent process, youngest child, younger sibling,
1100          * older sibling, respectively.  (p->father can be replaced with
1101          * p->real_parent->pid)
1102          */
1103         struct task_struct *real_parent; /* real parent process */
1104         struct task_struct *parent; /* recipient of SIGCHLD, wait4() reports */
1105         /*
1106          * children/sibling forms the list of my natural children
1107          */
1108         struct list_head children;      /* list of my children */
1109         struct list_head sibling;       /* linkage in my parent's children list */
1110         struct task_struct *group_leader;       /* threadgroup leader */
1111
1112         /*
1113          * ptraced is the list of tasks this task is using ptrace on.
1114          * This includes both natural children and PTRACE_ATTACH targets.
1115          * p->ptrace_entry is p's link on the p->parent->ptraced list.
1116          */
1117         struct list_head ptraced;
1118         struct list_head ptrace_entry;
1119
1120         /* PID/PID hash table linkage. */
1121         struct pid_link pids[PIDTYPE_MAX];
1122         struct list_head thread_group;
1123
1124         struct completion *vfork_done;          /* for vfork() */
1125         int __user *set_child_tid;              /* CLONE_CHILD_SETTID */
1126         int __user *clear_child_tid;            /* CLONE_CHILD_CLEARTID */
1127
1128         cputime_t utime, stime, utimescaled, stimescaled;
1129         cputime_t gtime;
1130         cputime_t prev_utime, prev_stime;
1131         unsigned long nvcsw, nivcsw; /* context switch counts */
1132         struct timespec start_time;             /* monotonic time */
1133         struct timespec real_start_time;        /* boot based time */
1134 /* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */
1135         unsigned long min_flt, maj_flt;
1136
1137         cputime_t it_prof_expires, it_virt_expires;
1138         unsigned long long it_sched_expires;
1139         struct list_head cpu_timers[3];
1140
1141 /* process credentials */
1142         uid_t uid,euid,suid,fsuid;
1143         gid_t gid,egid,sgid,fsgid;
1144         struct group_info *group_info;
1145         kernel_cap_t   cap_effective, cap_inheritable, cap_permitted, cap_bset;
1146         struct user_struct *user;
1147         unsigned securebits;
1148 #ifdef CONFIG_KEYS
1149         unsigned char jit_keyring;      /* default keyring to attach requested keys to */
1150         struct key *request_key_auth;   /* assumed request_key authority */
1151         struct key *thread_keyring;     /* keyring private to this thread */
1152 #endif
1153         char comm[TASK_COMM_LEN]; /* executable name excluding path
1154                                      - access with [gs]et_task_comm (which lock
1155                                        it with task_lock())
1156                                      - initialized normally by flush_old_exec */
1157 /* file system info */
1158         int link_count, total_link_count;
1159 #ifdef CONFIG_SYSVIPC
1160 /* ipc stuff */
1161         struct sysv_sem sysvsem;
1162 #endif
1163 #ifdef CONFIG_DETECT_SOFTLOCKUP
1164 /* hung task detection */
1165         unsigned long last_switch_timestamp;
1166         unsigned long last_switch_count;
1167 #endif
1168 /* CPU-specific state of this task */
1169         struct thread_struct thread;
1170 /* filesystem information */
1171         struct fs_struct *fs;
1172 /* open file information */
1173         struct files_struct *files;
1174 /* namespaces */
1175         struct nsproxy *nsproxy;
1176 /* signal handlers */
1177         struct signal_struct *signal;
1178         struct sighand_struct *sighand;
1179
1180         sigset_t blocked, real_blocked;
1181         sigset_t saved_sigmask; /* restored if set_restore_sigmask() was used */
1182         struct sigpending pending;
1183
1184         unsigned long sas_ss_sp;
1185         size_t sas_ss_size;
1186         int (*notifier)(void *priv);
1187         void *notifier_data;
1188         sigset_t *notifier_mask;
1189 #ifdef CONFIG_SECURITY
1190         void *security;
1191 #endif
1192         struct audit_context *audit_context;
1193 #ifdef CONFIG_AUDITSYSCALL
1194         uid_t loginuid;
1195         unsigned int sessionid;
1196 #endif
1197         seccomp_t seccomp;
1198
1199 /* Thread group tracking */
1200         u32 parent_exec_id;
1201         u32 self_exec_id;
1202 /* Protection of (de-)allocation: mm, files, fs, tty, keyrings */
1203         spinlock_t alloc_lock;
1204
1205         /* Protection of the PI data structures: */
1206         spinlock_t pi_lock;
1207
1208 #ifdef CONFIG_RT_MUTEXES
1209         /* PI waiters blocked on a rt_mutex held by this task */
1210         struct plist_head pi_waiters;
1211         /* Deadlock detection and priority inheritance handling */
1212         struct rt_mutex_waiter *pi_blocked_on;
1213 #endif
1214
1215 #ifdef CONFIG_DEBUG_MUTEXES
1216         /* mutex deadlock detection */
1217         struct mutex_waiter *blocked_on;
1218 #endif
1219 #ifdef CONFIG_TRACE_IRQFLAGS
1220         unsigned int irq_events;
1221         int hardirqs_enabled;
1222         unsigned long hardirq_enable_ip;
1223         unsigned int hardirq_enable_event;
1224         unsigned long hardirq_disable_ip;
1225         unsigned int hardirq_disable_event;
1226         int softirqs_enabled;
1227         unsigned long softirq_disable_ip;
1228         unsigned int softirq_disable_event;
1229         unsigned long softirq_enable_ip;
1230         unsigned int softirq_enable_event;
1231         int hardirq_context;
1232         int softirq_context;
1233 #endif
1234 #ifdef CONFIG_LOCKDEP
1235 # define MAX_LOCK_DEPTH 48UL
1236         u64 curr_chain_key;
1237         int lockdep_depth;
1238         unsigned int lockdep_recursion;
1239         struct held_lock held_locks[MAX_LOCK_DEPTH];
1240 #endif
1241
1242 /* journalling filesystem info */
1243         void *journal_info;
1244
1245 /* stacked block device info */
1246         struct bio *bio_list, **bio_tail;
1247
1248 /* VM state */
1249         struct reclaim_state *reclaim_state;
1250
1251         struct backing_dev_info *backing_dev_info;
1252
1253         struct io_context *io_context;
1254
1255         unsigned long ptrace_message;
1256         siginfo_t *last_siginfo; /* For ptrace use.  */
1257         struct task_io_accounting ioac;
1258 #if defined(CONFIG_TASK_XACCT)
1259         u64 acct_rss_mem1;      /* accumulated rss usage */
1260         u64 acct_vm_mem1;       /* accumulated virtual memory usage */
1261         cputime_t acct_timexpd; /* stime + utime since last update */
1262 #endif
1263 #ifdef CONFIG_CPUSETS
1264         nodemask_t mems_allowed;
1265         int cpuset_mems_generation;
1266         int cpuset_mem_spread_rotor;
1267 #endif
1268 #ifdef CONFIG_CGROUPS
1269         /* Control Group info protected by css_set_lock */
1270         struct css_set *cgroups;
1271         /* cg_list protected by css_set_lock and tsk->alloc_lock */
1272         struct list_head cg_list;
1273 #endif
1274 #ifdef CONFIG_FUTEX
1275         struct robust_list_head __user *robust_list;
1276 #ifdef CONFIG_COMPAT
1277         struct compat_robust_list_head __user *compat_robust_list;
1278 #endif
1279         struct list_head pi_state_list;
1280         struct futex_pi_state *pi_state_cache;
1281 #endif
1282 #ifdef CONFIG_NUMA
1283         struct mempolicy *mempolicy;
1284         short il_next;
1285 #endif
1286         atomic_t fs_excl;       /* holding fs exclusive resources */
1287         struct rcu_head rcu;
1288
1289         struct list_head        *scm_work_list;
1290
1291 /*
1292          * cache last used pipe for splice
1293          */
1294         struct pipe_inode_info *splice_pipe;
1295 #ifdef  CONFIG_TASK_DELAY_ACCT
1296         struct task_delay_info *delays;
1297 #endif
1298 #ifdef CONFIG_FAULT_INJECTION
1299         int make_it_fail;
1300 #endif
1301         struct prop_local_single dirties;
1302 #ifdef CONFIG_LATENCYTOP
1303         int latency_record_count;
1304         struct latency_record latency_record[LT_SAVECOUNT];
1305 #endif
1306 };
1307
1308 /*
1309  * Priority of a process goes from 0..MAX_PRIO-1, valid RT
1310  * priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL/SCHED_BATCH
1311  * tasks are in the range MAX_RT_PRIO..MAX_PRIO-1. Priority
1312  * values are inverted: lower p->prio value means higher priority.
1313  *
1314  * The MAX_USER_RT_PRIO value allows the actual maximum
1315  * RT priority to be separate from the value exported to
1316  * user-space.  This allows kernel threads to set their
1317  * priority to a value higher than any user task. Note:
1318  * MAX_RT_PRIO must not be smaller than MAX_USER_RT_PRIO.
1319  */
1320
1321 #define MAX_USER_RT_PRIO        100
1322 #define MAX_RT_PRIO             MAX_USER_RT_PRIO
1323
1324 #define MAX_PRIO                (MAX_RT_PRIO + 40)
1325 #define DEFAULT_PRIO            (MAX_RT_PRIO + 20)
1326
1327 static inline int rt_prio(int prio)
1328 {
1329         if (unlikely(prio < MAX_RT_PRIO))
1330                 return 1;
1331         return 0;
1332 }
1333
1334 static inline int rt_task(struct task_struct *p)
1335 {
1336         return rt_prio(p->prio);
1337 }
1338
1339 static inline void set_task_session(struct task_struct *tsk, pid_t session)
1340 {
1341         tsk->signal->__session = session;
1342 }
1343
1344 static inline void set_task_pgrp(struct task_struct *tsk, pid_t pgrp)
1345 {
1346         tsk->signal->__pgrp = pgrp;
1347 }
1348
1349 static inline struct pid *task_pid(struct task_struct *task)
1350 {
1351         return task->pids[PIDTYPE_PID].pid;
1352 }
1353
1354 static inline struct pid *task_tgid(struct task_struct *task)
1355 {
1356         return task->group_leader->pids[PIDTYPE_PID].pid;
1357 }
1358
1359 static inline struct pid *task_pgrp(struct task_struct *task)
1360 {
1361         return task->group_leader->pids[PIDTYPE_PGID].pid;
1362 }
1363
1364 static inline struct pid *task_session(struct task_struct *task)
1365 {
1366         return task->group_leader->pids[PIDTYPE_SID].pid;
1367 }
1368
1369 struct pid_namespace;
1370
1371 /*
1372  * the helpers to get the task's different pids as they are seen
1373  * from various namespaces
1374  *
1375  * task_xid_nr()     : global id, i.e. the id seen from the init namespace;
1376  * task_xid_vnr()    : virtual id, i.e. the id seen from the pid namespace of
1377  *                     current.
1378  * task_xid_nr_ns()  : id seen from the ns specified;
1379  *
1380  * set_task_vxid()   : assigns a virtual id to a task;
1381  *
1382  * see also pid_nr() etc in include/linux/pid.h
1383  */
1384
1385 static inline pid_t task_pid_nr(struct task_struct *tsk)
1386 {
1387         return tsk->pid;
1388 }
1389
1390 pid_t task_pid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);
1391
1392 static inline pid_t task_pid_vnr(struct task_struct *tsk)
1393 {
1394         return pid_vnr(task_pid(tsk));
1395 }
1396
1397
1398 static inline pid_t task_tgid_nr(struct task_struct *tsk)
1399 {
1400         return tsk->tgid;
1401 }
1402
1403 pid_t task_tgid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);
1404
1405 static inline pid_t task_tgid_vnr(struct task_struct *tsk)
1406 {
1407         return pid_vnr(task_tgid(tsk));
1408 }
1409
1410
1411 static inline pid_t task_pgrp_nr(struct task_struct *tsk)
1412 {
1413         return tsk->signal->__pgrp;
1414 }
1415
1416 pid_t task_pgrp_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);
1417
1418 static inline pid_t task_pgrp_vnr(struct task_struct *tsk)
1419 {
1420         return pid_vnr(task_pgrp(tsk));
1421 }
1422
1423
1424 static inline pid_t task_session_nr(struct task_struct *tsk)
1425 {
1426         return tsk->signal->__session;
1427 }
1428
1429 pid_t task_session_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);
1430
1431 static inline pid_t task_session_vnr(struct task_struct *tsk)
1432 {
1433         return pid_vnr(task_session(tsk));
1434 }
1435
1436
1437 /**
1438  * pid_alive - check that a task structure is not stale
1439  * @p: Task structure to be checked.
1440  *
1441  * Test if a process is not yet dead (at most zombie state)
1442  * If pid_alive fails, then pointers within the task structure
1443  * can be stale and must not be dereferenced.
1444  */
1445 static inline int pid_alive(struct task_struct *p)
1446 {
1447         return p->pids[PIDTYPE_PID].pid != NULL;
1448 }
1449
1450 /**
1451  * is_global_init - check if a task structure is init
1452  * @tsk: Task structure to be checked.
1453  *
1454  * Check if a task structure is the first user space task the kernel created.
1455  */
1456 static inline int is_global_init(struct task_struct *tsk)
1457 {
1458         return tsk->pid == 1;
1459 }
1460
1461 /*
1462  * is_container_init:
1463  * check whether in the task is init in its own pid namespace.
1464  */
1465 extern int is_container_init(struct task_struct *tsk);
1466
1467 extern struct pid *cad_pid;
1468
1469 extern void free_task(struct task_struct *tsk);
1470 #define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0)
1471
1472 extern void __put_task_struct(struct task_struct *t);
1473
1474 static inline void put_task_struct(struct task_struct *t)
1475 {
1476         if (atomic_dec_and_test(&t->usage))
1477                 __put_task_struct(t);
1478 }
1479
1480 extern cputime_t task_utime(struct task_struct *p);
1481 extern cputime_t task_stime(struct task_struct *p);
1482 extern cputime_t task_gtime(struct task_struct *p);
1483
1484 /*
1485  * Per process flags
1486  */
1487 #define PF_ALIGNWARN    0x00000001      /* Print alignment warning msgs */
1488                                         /* Not implemented yet, only for 486*/
1489 #define PF_STARTING     0x00000002      /* being created */
1490 #define PF_EXITING      0x00000004      /* getting shut down */
1491 #define PF_EXITPIDONE   0x00000008      /* pi exit done on shut down */
1492 #define PF_VCPU         0x00000010      /* I'm a virtual CPU */
1493 #define PF_FORKNOEXEC   0x00000040      /* forked but didn't exec */
1494 #define PF_SUPERPRIV    0x00000100      /* used super-user privileges */
1495 #define PF_DUMPCORE     0x00000200      /* dumped core */
1496 #define PF_SIGNALED     0x00000400      /* killed by a signal */
1497 #define PF_MEMALLOC     0x00000800      /* Allocating memory */
1498 #define PF_FLUSHER      0x00001000      /* responsible for disk writeback */
1499 #define PF_USED_MATH    0x00002000      /* if unset the fpu must be initialized before use */
1500 #define PF_NOFREEZE     0x00008000      /* this thread should not be frozen */
1501 #define PF_FROZEN       0x00010000      /* frozen for system suspend */
1502 #define PF_FSTRANS      0x00020000      /* inside a filesystem transaction */
1503 #define PF_KSWAPD       0x00040000      /* I am kswapd */
1504 #define PF_SWAPOFF      0x00080000      /* I am in swapoff */
1505 #define PF_LESS_THROTTLE 0x00100000     /* Throttle me less: I clean memory */
1506 #define PF_KTHREAD      0x00200000      /* I am a kernel thread */
1507 #define PF_RANDOMIZE    0x00400000      /* randomize virtual address space */
1508 #define PF_SWAPWRITE    0x00800000      /* Allowed to write to swap */
1509 #define PF_SPREAD_PAGE  0x01000000      /* Spread page cache over cpuset */
1510 #define PF_SPREAD_SLAB  0x02000000      /* Spread some slab caches over cpuset */
1511 #define PF_THREAD_BOUND 0x04000000      /* Thread bound to specific cpu */
1512 #define PF_MEMPOLICY    0x10000000      /* Non-default NUMA mempolicy */
1513 #define PF_MUTEX_TESTER 0x20000000      /* Thread belongs to the rt mutex tester */
1514 #define PF_FREEZER_SKIP 0x40000000      /* Freezer should not count it as freezeable */
1515 #define PF_FREEZER_NOSIG 0x80000000     /* Freezer won't send signals to it */
1516
1517 /*
1518  * Only the _current_ task can read/write to tsk->flags, but other
1519  * tasks can access tsk->flags in readonly mode for example
1520  * with tsk_used_math (like during threaded core dumping).
1521  * There is however an exception to this rule during ptrace
1522  * or during fork: the ptracer task is allowed to write to the
1523  * child->flags of its traced child (same goes for fork, the parent
1524  * can write to the child->flags), because we're guaranteed the
1525  * child is not running and in turn not changing child->flags
1526  * at the same time the parent does it.
1527  */
1528 #define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0)
1529 #define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0)
1530 #define clear_used_math() clear_stopped_child_used_math(current)
1531 #define set_used_math() set_stopped_child_used_math(current)
1532 #define conditional_stopped_child_used_math(condition, child) \
1533         do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0)
1534 #define conditional_used_math(condition) \
1535         conditional_stopped_child_used_math(condition, current)
1536 #define copy_to_stopped_child_used_math(child) \
1537         do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0)
1538 /* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */
1539 #define tsk_used_math(p) ((p)->flags & PF_USED_MATH)
1540 #define used_math() tsk_used_math(current)
1541
1542 #ifdef CONFIG_SMP
1543 extern int set_cpus_allowed_ptr(struct task_struct *p,
1544                                 const cpumask_t *new_mask);
1545 #else
1546 static inline int set_cpus_allowed_ptr(struct task_struct *p,
1547                                        const cpumask_t *new_mask)
1548 {
1549         if (!cpu_isset(0, *new_mask))
1550                 return -EINVAL;
1551         return 0;
1552 }
1553 #endif
1554 static inline int set_cpus_allowed(struct task_struct *p, cpumask_t new_mask)
1555 {
1556         return set_cpus_allowed_ptr(p, &new_mask);
1557 }
1558
1559 extern unsigned long long sched_clock(void);
1560
1561 extern void sched_clock_init(void);
1562 extern u64 sched_clock_cpu(int cpu);
1563
1564 #ifndef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK
1565 static inline void sched_clock_tick(void)
1566 {
1567 }
1568
1569 static inline void sched_clock_idle_sleep_event(void)
1570 {
1571 }
1572
1573 static inline void sched_clock_idle_wakeup_event(u64 delta_ns)
1574 {
1575 }
1576 #else
1577 extern void sched_clock_tick(void);
1578 extern void sched_clock_idle_sleep_event(void);
1579 extern void sched_clock_idle_wakeup_event(u64 delta_ns);
1580 #endif
1581
1582 /*
1583  * For kernel-internal use: high-speed (but slightly incorrect) per-cpu
1584  * clock constructed from sched_clock():
1585  */
1586 extern unsigned long long cpu_clock(int cpu);
1587
1588 extern unsigned long long
1589 task_sched_runtime(struct task_struct *task);
1590
1591 /* sched_exec is called by processes performing an exec */
1592 #ifdef CONFIG_SMP
1593 extern void sched_exec(void);
1594 #else
1595 #define sched_exec()   {}
1596 #endif
1597
1598 extern void sched_clock_idle_sleep_event(void);
1599 extern void sched_clock_idle_wakeup_event(u64 delta_ns);
1600
1601 #ifdef CONFIG_HOTPLUG_CPU
1602 extern void idle_task_exit(void);
1603 #else
1604 static inline void idle_task_exit(void) {}
1605 #endif
1606
1607 extern void sched_idle_next(void);
1608
1609 #if defined(CONFIG_NO_HZ) && defined(CONFIG_SMP)
1610 extern void wake_up_idle_cpu(int cpu);
1611 #else
1612 static inline void wake_up_idle_cpu(int cpu) { }
1613 #endif
1614
1615 #ifdef CONFIG_SCHED_DEBUG
1616 extern unsigned int sysctl_sched_latency;
1617 extern unsigned int sysctl_sched_min_granularity;
1618 extern unsigned int sysctl_sched_wakeup_granularity;
1619 extern unsigned int sysctl_sched_child_runs_first;
1620 extern unsigned int sysctl_sched_features;
1621 extern unsigned int sysctl_sched_migration_cost;
1622 extern unsigned int sysctl_sched_nr_migrate;
1623 extern unsigned int sysctl_sched_shares_ratelimit;
1624
1625 int sched_nr_latency_handler(struct ctl_table *table, int write,
1626                 struct file *file, void __user *buffer, size_t *length,
1627                 loff_t *ppos);
1628 #endif
1629 extern unsigned int sysctl_sched_rt_period;
1630 extern int sysctl_sched_rt_runtime;
1631
1632 int sched_rt_handler(struct ctl_table *table, int write,
1633                 struct file *filp, void __user *buffer, size_t *lenp,
1634                 loff_t *ppos);
1635
1636 extern unsigned int sysctl_sched_compat_yield;
1637
1638 #ifdef CONFIG_RT_MUTEXES
1639 extern int rt_mutex_getprio(struct task_struct *p);
1640 extern void rt_mutex_setprio(struct task_struct *p, int prio);
1641 extern void rt_mutex_adjust_pi(struct task_struct *p);
1642 #else
1643 static inline int rt_mutex_getprio(struct task_struct *p)
1644 {
1645         return p->normal_prio;
1646 }
1647 # define rt_mutex_adjust_pi(p)          do { } while (0)
1648 #endif
1649
1650 extern void set_user_nice(struct task_struct *p, long nice);
1651 extern int task_prio(const struct task_struct *p);
1652 extern int task_nice(const struct task_struct *p);
1653 extern int can_nice(const struct task_struct *p, const int nice);
1654 extern int task_curr(const struct task_struct *p);
1655 extern int idle_cpu(int cpu);
1656 extern int sched_setscheduler(struct task_struct *, int, struct sched_param *);
1657 extern int sched_setscheduler_nocheck(struct task_struct *, int,
1658                                       struct sched_param *);
1659 extern struct task_struct *idle_task(int cpu);
1660 extern struct task_struct *curr_task(int cpu);
1661 extern void set_curr_task(int cpu, struct task_struct *p);
1662
1663 void yield(void);
1664
1665 /*
1666  * The default (Linux) execution domain.
1667  */
1668 extern struct exec_domain       default_exec_domain;
1669
1670 union thread_union {
1671         struct thread_info thread_info;
1672         unsigned long stack[THREAD_SIZE/sizeof(long)];
1673 };
1674
1675 #ifndef __HAVE_ARCH_KSTACK_END
1676 static inline int kstack_end(void *addr)
1677 {
1678         /* Reliable end of stack detection:
1679          * Some APM bios versions misalign the stack
1680          */
1681         return !(((unsigned long)addr+sizeof(void*)-1) & (THREAD_SIZE-sizeof(void*)));
1682 }
1683 #endif
1684
1685 extern union thread_union init_thread_union;
1686 extern struct task_struct init_task;
1687
1688 extern struct   mm_struct init_mm;
1689
1690 extern struct pid_namespace init_pid_ns;
1691
1692 /*
1693  * find a task by one of its numerical ids
1694  *
1695  * find_task_by_pid_type_ns():
1696  *      it is the most generic call - it finds a task by all id,
1697  *      type and namespace specified
1698  * find_task_by_pid_ns():
1699  *      finds a task by its pid in the specified namespace
1700  * find_task_by_vpid():
1701  *      finds a task by its virtual pid
1702  *
1703  * see also find_vpid() etc in include/linux/pid.h
1704  */
1705
1706 extern struct task_struct *find_task_by_pid_type_ns(int type, int pid,
1707                 struct pid_namespace *ns);
1708
1709 extern struct task_struct *find_task_by_vpid(pid_t nr);
1710 extern struct task_struct *find_task_by_pid_ns(pid_t nr,
1711                 struct pid_namespace *ns);
1712
1713 extern void __set_special_pids(struct pid *pid);
1714
1715 /* per-UID process charging. */
1716 extern struct user_struct * alloc_uid(struct user_namespace *, uid_t);
1717 static inline struct user_struct *get_uid(struct user_struct *u)
1718 {
1719         atomic_inc(&u->__count);
1720         return u;
1721 }
1722 extern void free_uid(struct user_struct *);
1723 extern void switch_uid(struct user_struct *);
1724 extern void release_uids(struct user_namespace *ns);
1725
1726 #include <asm/current.h>
1727
1728 extern void do_timer(unsigned long ticks);
1729
1730 extern int wake_up_state(struct task_struct *tsk, unsigned int state);
1731 extern int wake_up_process(struct task_struct *tsk);
1732 extern void wake_up_new_task(struct task_struct *tsk,
1733                                 unsigned long clone_flags);
1734 #ifdef CONFIG_SMP
1735  extern void kick_process(struct task_struct *tsk);
1736 #else
1737  static inline void kick_process(struct task_struct *tsk) { }
1738 #endif
1739 extern void sched_fork(struct task_struct *p, int clone_flags);
1740 extern void sched_dead(struct task_struct *p);
1741
1742 extern int in_group_p(gid_t);
1743 extern int in_egroup_p(gid_t);
1744
1745 extern void proc_caches_init(void);
1746 extern void flush_signals(struct task_struct *);
1747 extern void ignore_signals(struct task_struct *);
1748 extern void flush_signal_handlers(struct task_struct *, int force_default);
1749 extern int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info);
1750
1751 static inline int dequeue_signal_lock(struct task_struct *tsk, sigset_t *mask, siginfo_t *info)
1752 {
1753         unsigned long flags;
1754         int ret;
1755
1756         spin_lock_irqsave(&tsk->sighand->siglock, flags);
1757         ret = dequeue_signal(tsk, mask, info);
1758         spin_unlock_irqrestore(&tsk->sighand->siglock, flags);
1759
1760         return ret;
1761 }
1762
1763 extern void block_all_signals(int (*notifier)(void *priv), void *priv,
1764                               sigset_t *mask);
1765 extern void unblock_all_signals(void);
1766 extern void release_task(struct task_struct * p);
1767 extern int send_sig_info(int, struct siginfo *, struct task_struct *);
1768 extern int force_sigsegv(int, struct task_struct *);
1769 extern int force_sig_info(int, struct siginfo *, struct task_struct *);
1770 extern int __kill_pgrp_info(int sig, struct siginfo *info, struct pid *pgrp);
1771 extern int kill_pid_info(int sig, struct siginfo *info, struct pid *pid);
1772 extern int kill_pid_info_as_uid(int, struct siginfo *, struct pid *, uid_t, uid_t, u32);
1773 extern int kill_pgrp(struct pid *pid, int sig, int priv);
1774 extern int kill_pid(struct pid *pid, int sig, int priv);
1775 extern int kill_proc_info(int, struct siginfo *, pid_t);
1776 extern int do_notify_parent(struct task_struct *, int);
1777 extern void force_sig(int, struct task_struct *);
1778 extern void force_sig_specific(int, struct task_struct *);
1779 extern int send_sig(int, struct task_struct *, int);
1780 extern void zap_other_threads(struct task_struct *p);
1781 extern struct sigqueue *sigqueue_alloc(void);
1782 extern void sigqueue_free(struct sigqueue *);
1783 extern int send_sigqueue(struct sigqueue *,  struct task_struct *, int group);
1784 extern int do_sigaction(int, struct k_sigaction *, struct k_sigaction *);
1785 extern int do_sigaltstack(const stack_t __user *, stack_t __user *, unsigned long);
1786
1787 static inline int kill_cad_pid(int sig, int priv)
1788 {
1789         return kill_pid(cad_pid, sig, priv);
1790 }
1791
1792 /* These can be the second arg to send_sig_info/send_group_sig_info.  */
1793 #define SEND_SIG_NOINFO ((struct siginfo *) 0)
1794 #define SEND_SIG_PRIV   ((struct siginfo *) 1)
1795 #define SEND_SIG_FORCED ((struct siginfo *) 2)
1796
1797 static inline int is_si_special(const struct siginfo *info)
1798 {
1799         return info <= SEND_SIG_FORCED;
1800 }
1801
1802 /* True if we are on the alternate signal stack.  */
1803
1804 static inline int on_sig_stack(unsigned long sp)
1805 {
1806         return (sp - current->sas_ss_sp < current->sas_ss_size);
1807 }
1808
1809 static inline int sas_ss_flags(unsigned long sp)
1810 {
1811         return (current->sas_ss_size == 0 ? SS_DISABLE
1812                 : on_sig_stack(sp) ? SS_ONSTACK : 0);
1813 }
1814
1815 /*
1816  * Routines for handling mm_structs
1817  */
1818 extern struct mm_struct * mm_alloc(void);
1819
1820 /* mmdrop drops the mm and the page tables */
1821 extern void __mmdrop(struct mm_struct *);
1822 static inline void mmdrop(struct mm_struct * mm)
1823 {
1824         if (unlikely(atomic_dec_and_test(&mm->mm_count)))
1825                 __mmdrop(mm);
1826 }
1827
1828 /* mmput gets rid of the mappings and all user-space */
1829 extern void mmput(struct mm_struct *);
1830 /* Grab a reference to a task's mm, if it is not already going away */
1831 extern struct mm_struct *get_task_mm(struct task_struct *task);
1832 /* Remove the current tasks stale references to the old mm_struct */
1833 extern void mm_release(struct task_struct *, struct mm_struct *);
1834 /* Allocate a new mm structure and copy contents from tsk->mm */
1835 extern struct mm_struct *dup_mm(struct task_struct *tsk);
1836
1837 extern int  copy_thread(int, unsigned long, unsigned long, unsigned long, struct task_struct *, struct pt_regs *);
1838 extern void flush_thread(void);
1839 extern void exit_thread(void);
1840
1841 extern void exit_files(struct task_struct *);
1842 extern void __cleanup_signal(struct signal_struct *);
1843 extern void __cleanup_sighand(struct sighand_struct *);
1844
1845 extern void exit_itimers(struct signal_struct *);
1846 extern void flush_itimer_signals(void);
1847
1848 extern NORET_TYPE void do_group_exit(int);
1849
1850 extern void daemonize(const char *, ...);
1851 extern int allow_signal(int);
1852 extern int disallow_signal(int);
1853
1854 extern int do_execve(char *, char __user * __user *, char __user * __user *, struct pt_regs *);
1855 extern long do_fork(unsigned long, unsigned long, struct pt_regs *, unsigned long, int __user *, int __user *);
1856 struct task_struct *fork_idle(int);
1857
1858 extern void set_task_comm(struct task_struct *tsk, char *from);
1859 extern char *get_task_comm(char *to, struct task_struct *tsk);
1860
1861 #ifdef CONFIG_SMP
1862 extern unsigned long wait_task_inactive(struct task_struct *, long match_state);
1863 #else
1864 static inline unsigned long wait_task_inactive(struct task_struct *p,
1865                                                long match_state)
1866 {
1867         return 1;
1868 }
1869 #endif
1870
1871 #define next_task(p)    list_entry(rcu_dereference((p)->tasks.next), struct task_struct, tasks)
1872
1873 #define for_each_process(p) \
1874         for (p = &init_task ; (p = next_task(p)) != &init_task ; )
1875
1876 /*
1877  * Careful: do_each_thread/while_each_thread is a double loop so
1878  *          'break' will not work as expected - use goto instead.
1879  */
1880 #define do_each_thread(g, t) \
1881         for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do
1882
1883 #define while_each_thread(g, t) \
1884         while ((t = next_thread(t)) != g)
1885
1886 /* de_thread depends on thread_group_leader not being a pid based check */
1887 #define thread_group_leader(p)  (p == p->group_leader)
1888
1889 /* Do to the insanities of de_thread it is possible for a process
1890  * to have the pid of the thread group leader without actually being
1891  * the thread group leader.  For iteration through the pids in proc
1892  * all we care about is that we have a task with the appropriate
1893  * pid, we don't actually care if we have the right task.
1894  */
1895 static inline int has_group_leader_pid(struct task_struct *p)
1896 {
1897         return p->pid == p->tgid;
1898 }
1899
1900 static inline
1901 int same_thread_group(struct task_struct *p1, struct task_struct *p2)
1902 {
1903         return p1->tgid == p2->tgid;
1904 }
1905
1906 static inline struct task_struct *next_thread(const struct task_struct *p)
1907 {
1908         return list_entry(rcu_dereference(p->thread_group.next),
1909                           struct task_struct, thread_group);
1910 }
1911
1912 static inline int thread_group_empty(struct task_struct *p)
1913 {
1914         return list_empty(&p->thread_group);
1915 }
1916
1917 #define delay_group_leader(p) \
1918                 (thread_group_leader(p) && !thread_group_empty(p))
1919
1920 /*
1921  * Protects ->fs, ->files, ->mm, ->group_info, ->comm, keyring
1922  * subscriptions and synchronises with wait4().  Also used in procfs.  Also
1923  * pins the final release of task.io_context.  Also protects ->cpuset and
1924  * ->cgroup.subsys[].
1925  *
1926  * Nests both inside and outside of read_lock(&tasklist_lock).
1927  * It must not be nested with write_lock_irq(&tasklist_lock),
1928  * neither inside nor outside.
1929  */
1930 static inline void task_lock(struct task_struct *p)
1931 {
1932         spin_lock(&p->alloc_lock);
1933 }
1934
1935 static inline void task_unlock(struct task_struct *p)
1936 {
1937         spin_unlock(&p->alloc_lock);
1938 }
1939
1940 extern struct sighand_struct *lock_task_sighand(struct task_struct *tsk,
1941                                                         unsigned long *flags);
1942
1943 static inline void unlock_task_sighand(struct task_struct *tsk,
1944                                                 unsigned long *flags)
1945 {
1946         spin_unlock_irqrestore(&tsk->sighand->siglock, *flags);
1947 }
1948
1949 #ifndef __HAVE_THREAD_FUNCTIONS
1950
1951 #define task_thread_info(task)  ((struct thread_info *)(task)->stack)
1952 #define task_stack_page(task)   ((task)->stack)
1953
1954 static inline void setup_thread_stack(struct task_struct *p, struct task_struct *org)
1955 {
1956         *task_thread_info(p) = *task_thread_info(org);
1957         task_thread_info(p)->task = p;
1958 }
1959
1960 static inline unsigned long *end_of_stack(struct task_struct *p)
1961 {
1962         return (unsigned long *)(task_thread_info(p) + 1);
1963 }
1964
1965 #endif
1966
1967 static inline int object_is_on_stack(void *obj)
1968 {
1969         void *stack = task_stack_page(current);
1970
1971         return (obj >= stack) && (obj < (stack + THREAD_SIZE));
1972 }
1973
1974 extern void thread_info_cache_init(void);
1975
1976 /* set thread flags in other task's structures
1977  * - see asm/thread_info.h for TIF_xxxx flags available
1978  */
1979 static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag)
1980 {
1981         set_ti_thread_flag(task_thread_info(tsk), flag);
1982 }
1983
1984 static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag)
1985 {
1986         clear_ti_thread_flag(task_thread_info(tsk), flag);
1987 }
1988
1989 static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag)
1990 {
1991         return test_and_set_ti_thread_flag(task_thread_info(tsk), flag);
1992 }
1993
1994 static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag)
1995 {
1996         return test_and_clear_ti_thread_flag(task_thread_info(tsk), flag);
1997 }
1998
1999 static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag)
2000 {
2001         return test_ti_thread_flag(task_thread_info(tsk), flag);
2002 }
2003
2004 static inline void set_tsk_need_resched(struct task_struct *tsk)
2005 {
2006         set_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
2007 }
2008
2009 static inline void clear_tsk_need_resched(struct task_struct *tsk)
2010 {
2011         clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
2012 }
2013
2014 static inline int test_tsk_need_resched(struct task_struct *tsk)
2015 {
2016         return unlikely(test_tsk_thread_flag(tsk,TIF_NEED_RESCHED));
2017 }
2018
2019 static inline int signal_pending(struct task_struct *p)
2020 {
2021         return unlikely(test_tsk_thread_flag(p,TIF_SIGPENDING));
2022 }
2023
2024 extern int __fatal_signal_pending(struct task_struct *p);
2025
2026 static inline int fatal_signal_pending(struct task_struct *p)
2027 {
2028         return signal_pending(p) && __fatal_signal_pending(p);
2029 }
2030
2031 static inline int signal_pending_state(long state, struct task_struct *p)
2032 {
2033         if (!(state & (TASK_INTERRUPTIBLE | TASK_WAKEKILL)))
2034                 return 0;
2035         if (!signal_pending(p))
2036                 return 0;
2037
2038         return (state & TASK_INTERRUPTIBLE) || __fatal_signal_pending(p);
2039 }
2040
2041 static inline int need_resched(void)
2042 {
2043         return unlikely(test_thread_flag(TIF_NEED_RESCHED));
2044 }
2045
2046 /*
2047  * cond_resched() and cond_resched_lock(): latency reduction via
2048  * explicit rescheduling in places that are safe. The return
2049  * value indicates whether a reschedule was done in fact.
2050  * cond_resched_lock() will drop the spinlock before scheduling,
2051  * cond_resched_softirq() will enable bhs before scheduling.
2052  */
2053 extern int _cond_resched(void);
2054 #ifdef CONFIG_PREEMPT_BKL
2055 static inline int cond_resched(void)
2056 {
2057         return 0;
2058 }
2059 #else
2060 static inline int cond_resched(void)
2061 {
2062         return _cond_resched();
2063 }
2064 #endif
2065 extern int cond_resched_lock(spinlock_t * lock);
2066 extern int cond_resched_softirq(void);
2067 static inline int cond_resched_bkl(void)
2068 {
2069         return _cond_resched();
2070 }
2071
2072 /*
2073  * Does a critical section need to be broken due to another
2074  * task waiting?: (technically does not depend on CONFIG_PREEMPT,
2075  * but a general need for low latency)
2076  */
2077 static inline int spin_needbreak(spinlock_t *lock)
2078 {
2079 #ifdef CONFIG_PREEMPT
2080         return spin_is_contended(lock);
2081 #else
2082         return 0;
2083 #endif
2084 }
2085
2086 /*
2087  * Reevaluate whether the task has signals pending delivery.
2088  * Wake the task if so.
2089  * This is required every time the blocked sigset_t changes.
2090  * callers must hold sighand->siglock.
2091  */
2092 extern void recalc_sigpending_and_wake(struct task_struct *t);
2093 extern void recalc_sigpending(void);
2094
2095 extern void signal_wake_up(struct task_struct *t, int resume_stopped);
2096
2097 /*
2098  * Wrappers for p->thread_info->cpu access. No-op on UP.
2099  */
2100 #ifdef CONFIG_SMP
2101
2102 static inline unsigned int task_cpu(const struct task_struct *p)
2103 {
2104         return task_thread_info(p)->cpu;
2105 }
2106
2107 extern void set_task_cpu(struct task_struct *p, unsigned int cpu);
2108
2109 #else
2110
2111 static inline unsigned int task_cpu(const struct task_struct *p)
2112 {
2113         return 0;
2114 }
2115
2116 static inline void set_task_cpu(struct task_struct *p, unsigned int cpu)
2117 {
2118 }
2119
2120 #endif /* CONFIG_SMP */
2121
2122 extern void arch_pick_mmap_layout(struct mm_struct *mm);
2123
2124 #ifdef CONFIG_TRACING
2125 extern void
2126 __trace_special(void *__tr, void *__data,
2127                 unsigned long arg1, unsigned long arg2, unsigned long arg3);
2128 #else
2129 static inline void
2130 __trace_special(void *__tr, void *__data,
2131                 unsigned long arg1, unsigned long arg2, unsigned long arg3)
2132 {
2133 }
2134 #endif
2135
2136 extern long sched_setaffinity(pid_t pid, const cpumask_t *new_mask);
2137 extern long sched_getaffinity(pid_t pid, cpumask_t *mask);
2138
2139 extern int sched_mc_power_savings, sched_smt_power_savings;
2140
2141 extern void normalize_rt_tasks(void);
2142
2143 #ifdef CONFIG_GROUP_SCHED
2144
2145 extern struct task_group init_task_group;
2146 #ifdef CONFIG_USER_SCHED
2147 extern struct task_group root_task_group;
2148 #endif
2149
2150 extern struct task_group *sched_create_group(struct task_group *parent);
2151 extern void sched_destroy_group(struct task_group *tg);
2152 extern void sched_move_task(struct task_struct *tsk);
2153 #ifdef CONFIG_FAIR_GROUP_SCHED
2154 extern int sched_group_set_shares(struct task_group *tg, unsigned long shares);
2155 extern unsigned long sched_group_shares(struct task_group *tg);
2156 #endif
2157 #ifdef CONFIG_RT_GROUP_SCHED
2158 extern int sched_group_set_rt_runtime(struct task_group *tg,
2159                                       long rt_runtime_us);
2160 extern long sched_group_rt_runtime(struct task_group *tg);
2161 extern int sched_group_set_rt_period(struct task_group *tg,
2162                                       long rt_period_us);
2163 extern long sched_group_rt_period(struct task_group *tg);
2164 #endif
2165 #endif
2166
2167 #ifdef CONFIG_TASK_XACCT
2168 static inline void add_rchar(struct task_struct *tsk, ssize_t amt)
2169 {
2170         tsk->ioac.rchar += amt;
2171 }
2172
2173 static inline void add_wchar(struct task_struct *tsk, ssize_t amt)
2174 {
2175         tsk->ioac.wchar += amt;
2176 }
2177
2178 static inline void inc_syscr(struct task_struct *tsk)
2179 {
2180         tsk->ioac.syscr++;
2181 }
2182
2183 static inline void inc_syscw(struct task_struct *tsk)
2184 {
2185         tsk->ioac.syscw++;
2186 }
2187 #else
2188 static inline void add_rchar(struct task_struct *tsk, ssize_t amt)
2189 {
2190 }
2191
2192 static inline void add_wchar(struct task_struct *tsk, ssize_t amt)
2193 {
2194 }
2195
2196 static inline void inc_syscr(struct task_struct *tsk)
2197 {
2198 }
2199
2200 static inline void inc_syscw(struct task_struct *tsk)
2201 {
2202 }
2203 #endif
2204
2205 #ifndef TASK_SIZE_OF
2206 #define TASK_SIZE_OF(tsk)       TASK_SIZE
2207 #endif
2208
2209 #ifdef CONFIG_MM_OWNER
2210 extern void mm_update_next_owner(struct mm_struct *mm);
2211 extern void mm_init_owner(struct mm_struct *mm, struct task_struct *p);
2212 #else
2213 static inline void mm_update_next_owner(struct mm_struct *mm)
2214 {
2215 }
2216
2217 static inline void mm_init_owner(struct mm_struct *mm, struct task_struct *p)
2218 {
2219 }
2220 #endif /* CONFIG_MM_OWNER */
2221
2222 #define TASK_STATE_TO_CHAR_STR "RSDTtZX"
2223
2224 #endif /* __KERNEL__ */
2225
2226 #endif