blob: 36a10781c3f3b77076df64eb42cfaa12caafbe45 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001#ifndef _LINUX_SCHED_H
2#define _LINUX_SCHED_H
3
4#include <asm/param.h> /* for HZ */
5
6#include <linux/config.h>
7#include <linux/capability.h>
8#include <linux/threads.h>
9#include <linux/kernel.h>
10#include <linux/types.h>
11#include <linux/timex.h>
12#include <linux/jiffies.h>
13#include <linux/rbtree.h>
14#include <linux/thread_info.h>
15#include <linux/cpumask.h>
16#include <linux/errno.h>
17#include <linux/nodemask.h>
18
19#include <asm/system.h>
20#include <asm/semaphore.h>
21#include <asm/page.h>
22#include <asm/ptrace.h>
23#include <asm/mmu.h>
24#include <asm/cputime.h>
25
26#include <linux/smp.h>
27#include <linux/sem.h>
28#include <linux/signal.h>
29#include <linux/securebits.h>
30#include <linux/fs_struct.h>
31#include <linux/compiler.h>
32#include <linux/completion.h>
33#include <linux/pid.h>
34#include <linux/percpu.h>
35#include <linux/topology.h>
36#include <linux/seccomp.h>
37
38struct exec_domain;
39
40/*
41 * cloning flags:
42 */
43#define CSIGNAL 0x000000ff /* signal mask to be sent at exit */
44#define CLONE_VM 0x00000100 /* set if VM shared between processes */
45#define CLONE_FS 0x00000200 /* set if fs info shared between processes */
46#define CLONE_FILES 0x00000400 /* set if open files shared between processes */
47#define CLONE_SIGHAND 0x00000800 /* set if signal handlers and blocked signals shared */
48#define CLONE_PTRACE 0x00002000 /* set if we want to let tracing continue on the child too */
49#define CLONE_VFORK 0x00004000 /* set if the parent wants the child to wake it up on mm_release */
50#define CLONE_PARENT 0x00008000 /* set if we want to have the same parent as the cloner */
51#define CLONE_THREAD 0x00010000 /* Same thread group? */
52#define CLONE_NEWNS 0x00020000 /* New namespace group? */
53#define CLONE_SYSVSEM 0x00040000 /* share system V SEM_UNDO semantics */
54#define CLONE_SETTLS 0x00080000 /* create a new TLS for the child */
55#define CLONE_PARENT_SETTID 0x00100000 /* set the TID in the parent */
56#define CLONE_CHILD_CLEARTID 0x00200000 /* clear the TID in the child */
57#define CLONE_DETACHED 0x00400000 /* Unused, ignored */
58#define CLONE_UNTRACED 0x00800000 /* set if the tracing process can't force CLONE_PTRACE on this clone */
59#define CLONE_CHILD_SETTID 0x01000000 /* set the TID in the child */
60#define CLONE_STOPPED 0x02000000 /* Start in stopped state */
61
62/*
63 * List of flags we want to share for kernel threads,
64 * if only because they are not used by them anyway.
65 */
66#define CLONE_KERNEL (CLONE_FS | CLONE_FILES | CLONE_SIGHAND)
67
68/*
69 * These are the constant used to fake the fixed-point load-average
70 * counting. Some notes:
71 * - 11 bit fractions expand to 22 bits by the multiplies: this gives
72 * a load-average precision of 10 bits integer + 11 bits fractional
73 * - if you want to count load-averages more often, you need more
74 * precision, or rounding will get you. With 2-second counting freq,
75 * the EXP_n values would be 1981, 2034 and 2043 if still using only
76 * 11 bit fractions.
77 */
78extern unsigned long avenrun[]; /* Load averages */
79
80#define FSHIFT 11 /* nr of bits of precision */
81#define FIXED_1 (1<<FSHIFT) /* 1.0 as fixed-point */
82#define LOAD_FREQ (5*HZ) /* 5 sec intervals */
83#define EXP_1 1884 /* 1/exp(5sec/1min) as fixed-point */
84#define EXP_5 2014 /* 1/exp(5sec/5min) */
85#define EXP_15 2037 /* 1/exp(5sec/15min) */
86
87#define CALC_LOAD(load,exp,n) \
88 load *= exp; \
89 load += n*(FIXED_1-exp); \
90 load >>= FSHIFT;
91
92extern unsigned long total_forks;
93extern int nr_threads;
94extern int last_pid;
95DECLARE_PER_CPU(unsigned long, process_counts);
96extern int nr_processes(void);
97extern unsigned long nr_running(void);
98extern unsigned long nr_uninterruptible(void);
99extern unsigned long nr_iowait(void);
100
101#include <linux/time.h>
102#include <linux/param.h>
103#include <linux/resource.h>
104#include <linux/timer.h>
105
106#include <asm/processor.h>
107
108#define TASK_RUNNING 0
109#define TASK_INTERRUPTIBLE 1
110#define TASK_UNINTERRUPTIBLE 2
111#define TASK_STOPPED 4
112#define TASK_TRACED 8
113#define EXIT_ZOMBIE 16
114#define EXIT_DEAD 32
115
116#define __set_task_state(tsk, state_value) \
117 do { (tsk)->state = (state_value); } while (0)
118#define set_task_state(tsk, state_value) \
119 set_mb((tsk)->state, (state_value))
120
121#define __set_current_state(state_value) \
122 do { current->state = (state_value); } while (0)
123#define set_current_state(state_value) \
124 set_mb(current->state, (state_value))
125
126/* Task command name length */
127#define TASK_COMM_LEN 16
128
129/*
130 * Scheduling policies
131 */
132#define SCHED_NORMAL 0
133#define SCHED_FIFO 1
134#define SCHED_RR 2
135
136struct sched_param {
137 int sched_priority;
138};
139
140#ifdef __KERNEL__
141
142#include <linux/spinlock.h>
143
144/*
145 * This serializes "schedule()" and also protects
146 * the run-queue from deletions/modifications (but
147 * _adding_ to the beginning of the run-queue has
148 * a separate lock).
149 */
150extern rwlock_t tasklist_lock;
151extern spinlock_t mmlist_lock;
152
153typedef struct task_struct task_t;
154
155extern void sched_init(void);
156extern void sched_init_smp(void);
157extern void init_idle(task_t *idle, int cpu);
158
159extern cpumask_t nohz_cpu_mask;
160
161extern void show_state(void);
162extern void show_regs(struct pt_regs *);
163
164/*
165 * TASK is a pointer to the task whose backtrace we want to see (or NULL for current
166 * task), SP is the stack pointer of the first frame that should be shown in the back
167 * trace (or NULL if the entire call-chain of the task should be shown).
168 */
169extern void show_stack(struct task_struct *task, unsigned long *sp);
170
171void io_schedule(void);
172long io_schedule_timeout(long timeout);
173
174extern void cpu_init (void);
175extern void trap_init(void);
176extern void update_process_times(int user);
177extern void scheduler_tick(void);
178
179/* Attach to any functions which should be ignored in wchan output. */
180#define __sched __attribute__((__section__(".sched.text")))
181/* Is this address in the __sched functions? */
182extern int in_sched_functions(unsigned long addr);
183
184#define MAX_SCHEDULE_TIMEOUT LONG_MAX
185extern signed long FASTCALL(schedule_timeout(signed long timeout));
186asmlinkage void schedule(void);
187
188struct namespace;
189
190/* Maximum number of active map areas.. This is a random (large) number */
191#define DEFAULT_MAX_MAP_COUNT 65536
192
193extern int sysctl_max_map_count;
194
195#include <linux/aio.h>
196
197extern unsigned long
198arch_get_unmapped_area(struct file *, unsigned long, unsigned long,
199 unsigned long, unsigned long);
200extern unsigned long
201arch_get_unmapped_area_topdown(struct file *filp, unsigned long addr,
202 unsigned long len, unsigned long pgoff,
203 unsigned long flags);
Wolfgang Wander1363c3c2005-06-21 17:14:49 -0700204extern void arch_unmap_area(struct mm_struct *, unsigned long);
205extern void arch_unmap_area_topdown(struct mm_struct *, unsigned long);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700206
207#define set_mm_counter(mm, member, value) (mm)->_##member = (value)
208#define get_mm_counter(mm, member) ((mm)->_##member)
209#define add_mm_counter(mm, member, value) (mm)->_##member += (value)
210#define inc_mm_counter(mm, member) (mm)->_##member++
211#define dec_mm_counter(mm, member) (mm)->_##member--
212typedef unsigned long mm_counter_t;
213
214struct mm_struct {
215 struct vm_area_struct * mmap; /* list of VMAs */
216 struct rb_root mm_rb;
217 struct vm_area_struct * mmap_cache; /* last find_vma result */
218 unsigned long (*get_unmapped_area) (struct file *filp,
219 unsigned long addr, unsigned long len,
220 unsigned long pgoff, unsigned long flags);
Wolfgang Wander1363c3c2005-06-21 17:14:49 -0700221 void (*unmap_area) (struct mm_struct *mm, unsigned long addr);
222 unsigned long mmap_base; /* base of mmap area */
223 unsigned long cached_hole_size; /* if non-zero, the largest hole below free_area_cache */
224 unsigned long free_area_cache; /* first hole of size cached_hole_size or larger */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225 pgd_t * pgd;
226 atomic_t mm_users; /* How many users with user space? */
227 atomic_t mm_count; /* How many references to "struct mm_struct" (users count as 1) */
228 int map_count; /* number of VMAs */
229 struct rw_semaphore mmap_sem;
230 spinlock_t page_table_lock; /* Protects page tables and some counters */
231
232 struct list_head mmlist; /* List of maybe swapped mm's. These are globally strung
233 * together off init_mm.mmlist, and are protected
234 * by mmlist_lock
235 */
236
237 unsigned long start_code, end_code, start_data, end_data;
238 unsigned long start_brk, brk, start_stack;
239 unsigned long arg_start, arg_end, env_start, env_end;
240 unsigned long total_vm, locked_vm, shared_vm;
241 unsigned long exec_vm, stack_vm, reserved_vm, def_flags, nr_ptes;
242
243 /* Special counters protected by the page_table_lock */
244 mm_counter_t _rss;
245 mm_counter_t _anon_rss;
246
247 unsigned long saved_auxv[42]; /* for /proc/PID/auxv */
248
Alan Coxd6e71142005-06-23 00:09:43 -0700249 unsigned dumpable:2;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250 cpumask_t cpu_vm_mask;
251
252 /* Architecture-specific MM context */
253 mm_context_t context;
254
255 /* Token based thrashing protection. */
256 unsigned long swap_token_time;
257 char recent_pagein;
258
259 /* coredumping support */
260 int core_waiters;
261 struct completion *core_startup_done, core_done;
262
263 /* aio bits */
264 rwlock_t ioctx_list_lock;
265 struct kioctx *ioctx_list;
266
267 struct kioctx default_kioctx;
268
269 unsigned long hiwater_rss; /* High-water RSS usage */
270 unsigned long hiwater_vm; /* High-water virtual memory usage */
271};
272
273struct sighand_struct {
274 atomic_t count;
275 struct k_sigaction action[_NSIG];
276 spinlock_t siglock;
277};
278
279/*
280 * NOTE! "signal_struct" does not have it's own
281 * locking, because a shared signal_struct always
282 * implies a shared sighand_struct, so locking
283 * sighand_struct is always a proper superset of
284 * the locking of signal_struct.
285 */
286struct signal_struct {
287 atomic_t count;
288 atomic_t live;
289
290 wait_queue_head_t wait_chldexit; /* for wait4() */
291
292 /* current thread group signal load-balancing target: */
293 task_t *curr_target;
294
295 /* shared signal handling: */
296 struct sigpending shared_pending;
297
298 /* thread group exit support */
299 int group_exit_code;
300 /* overloaded:
301 * - notify group_exit_task when ->count is equal to notify_count
302 * - everyone except group_exit_task is stopped during signal delivery
303 * of fatal signals, group_exit_task processes the signal.
304 */
305 struct task_struct *group_exit_task;
306 int notify_count;
307
308 /* thread group stop support, overloads group_exit_code too */
309 int group_stop_count;
310 unsigned int flags; /* see SIGNAL_* flags below */
311
312 /* POSIX.1b Interval Timers */
313 struct list_head posix_timers;
314
315 /* ITIMER_REAL timer for the process */
316 struct timer_list real_timer;
317 unsigned long it_real_value, it_real_incr;
318
319 /* ITIMER_PROF and ITIMER_VIRTUAL timers for the process */
320 cputime_t it_prof_expires, it_virt_expires;
321 cputime_t it_prof_incr, it_virt_incr;
322
323 /* job control IDs */
324 pid_t pgrp;
325 pid_t tty_old_pgrp;
326 pid_t session;
327 /* boolean value for session group leader */
328 int leader;
329
330 struct tty_struct *tty; /* NULL if no tty */
331
332 /*
333 * Cumulative resource counters for dead threads in the group,
334 * and for reaped dead child processes forked by this group.
335 * Live threads maintain their own counters and add to these
336 * in __exit_signal, except for the group leader.
337 */
338 cputime_t utime, stime, cutime, cstime;
339 unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw;
340 unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt;
341
342 /*
343 * Cumulative ns of scheduled CPU time for dead threads in the
344 * group, not including a zombie group leader. (This only differs
345 * from jiffies_to_ns(utime + stime) if sched_clock uses something
346 * other than jiffies.)
347 */
348 unsigned long long sched_time;
349
350 /*
351 * We don't bother to synchronize most readers of this at all,
352 * because there is no reader checking a limit that actually needs
353 * to get both rlim_cur and rlim_max atomically, and either one
354 * alone is a single word that can safely be read normally.
355 * getrlimit/setrlimit use task_lock(current->group_leader) to
356 * protect this instead of the siglock, because they really
357 * have no need to disable irqs.
358 */
359 struct rlimit rlim[RLIM_NLIMITS];
360
361 struct list_head cpu_timers[3];
362
363 /* keep the process-shared keyrings here so that they do the right
364 * thing in threads created with CLONE_THREAD */
365#ifdef CONFIG_KEYS
366 struct key *session_keyring; /* keyring inherited over fork */
367 struct key *process_keyring; /* keyring private to this process */
368#endif
369};
370
371/*
372 * Bits in flags field of signal_struct.
373 */
374#define SIGNAL_STOP_STOPPED 0x00000001 /* job control stop in effect */
375#define SIGNAL_STOP_DEQUEUED 0x00000002 /* stop signal dequeued */
376#define SIGNAL_STOP_CONTINUED 0x00000004 /* SIGCONT since WCONTINUED reap */
377#define SIGNAL_GROUP_EXIT 0x00000008 /* group exit in progress */
378
379
380/*
381 * Priority of a process goes from 0..MAX_PRIO-1, valid RT
382 * priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL tasks are
383 * in the range MAX_RT_PRIO..MAX_PRIO-1. Priority values
384 * are inverted: lower p->prio value means higher priority.
385 *
386 * The MAX_USER_RT_PRIO value allows the actual maximum
387 * RT priority to be separate from the value exported to
388 * user-space. This allows kernel threads to set their
389 * priority to a value higher than any user task. Note:
390 * MAX_RT_PRIO must not be smaller than MAX_USER_RT_PRIO.
391 */
392
393#define MAX_USER_RT_PRIO 100
394#define MAX_RT_PRIO MAX_USER_RT_PRIO
395
396#define MAX_PRIO (MAX_RT_PRIO + 40)
397
398#define rt_task(p) (unlikely((p)->prio < MAX_RT_PRIO))
399
400/*
401 * Some day this will be a full-fledged user tracking system..
402 */
403struct user_struct {
404 atomic_t __count; /* reference count */
405 atomic_t processes; /* How many processes does this user have? */
406 atomic_t files; /* How many open files does this user have? */
407 atomic_t sigpending; /* How many pending signals does this user have? */
408 /* protected by mq_lock */
409 unsigned long mq_bytes; /* How many bytes can be allocated to mqueue? */
410 unsigned long locked_shm; /* How many pages of mlocked shm ? */
411
412#ifdef CONFIG_KEYS
413 struct key *uid_keyring; /* UID specific keyring */
414 struct key *session_keyring; /* UID's default session keyring */
415#endif
416
417 /* Hash table maintenance information */
418 struct list_head uidhash_list;
419 uid_t uid;
420};
421
422extern struct user_struct *find_user(uid_t);
423
424extern struct user_struct root_user;
425#define INIT_USER (&root_user)
426
427typedef struct prio_array prio_array_t;
428struct backing_dev_info;
429struct reclaim_state;
430
431#ifdef CONFIG_SCHEDSTATS
432struct sched_info {
433 /* cumulative counters */
434 unsigned long cpu_time, /* time spent on the cpu */
435 run_delay, /* time spent waiting on a runqueue */
436 pcnt; /* # of timeslices run on this cpu */
437
438 /* timestamps */
439 unsigned long last_arrival, /* when we last ran on a cpu */
440 last_queued; /* when we were last queued to run */
441};
442
443extern struct file_operations proc_schedstat_operations;
444#endif
445
446enum idle_type
447{
448 SCHED_IDLE,
449 NOT_IDLE,
450 NEWLY_IDLE,
451 MAX_IDLE_TYPES
452};
453
454/*
455 * sched-domains (multiprocessor balancing) declarations:
456 */
457#ifdef CONFIG_SMP
458#define SCHED_LOAD_SCALE 128UL /* increase resolution of load */
459
460#define SD_LOAD_BALANCE 1 /* Do load balancing on this domain. */
461#define SD_BALANCE_NEWIDLE 2 /* Balance when about to become idle */
462#define SD_BALANCE_EXEC 4 /* Balance on exec */
Nick Piggin147cbb42005-06-25 14:57:19 -0700463#define SD_BALANCE_FORK 8 /* Balance on fork, clone */
464#define SD_WAKE_IDLE 16 /* Wake to idle CPU on task wakeup */
465#define SD_WAKE_AFFINE 32 /* Wake task to waking CPU */
466#define SD_WAKE_BALANCE 64 /* Perform balancing at task wakeup */
467#define SD_SHARE_CPUPOWER 128 /* Domain members share cpu power */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700468
469struct sched_group {
470 struct sched_group *next; /* Must be a circular list */
471 cpumask_t cpumask;
472
473 /*
474 * CPU power of this group, SCHED_LOAD_SCALE being max power for a
475 * single CPU. This is read only (except for setup, hotplug CPU).
476 */
477 unsigned long cpu_power;
478};
479
480struct sched_domain {
481 /* These fields must be setup */
482 struct sched_domain *parent; /* top domain must be null terminated */
483 struct sched_group *groups; /* the balancing groups of the domain */
484 cpumask_t span; /* span of all CPUs in this domain */
485 unsigned long min_interval; /* Minimum balance interval ms */
486 unsigned long max_interval; /* Maximum balance interval ms */
487 unsigned int busy_factor; /* less balancing by factor if busy */
488 unsigned int imbalance_pct; /* No balance until over watermark */
489 unsigned long long cache_hot_time; /* Task considered cache hot (ns) */
490 unsigned int cache_nice_tries; /* Leave cache hot tasks for # tries */
491 unsigned int per_cpu_gain; /* CPU % gained by adding domain cpus */
Nick Piggin78979862005-06-25 14:57:13 -0700492 unsigned int busy_idx;
493 unsigned int idle_idx;
494 unsigned int newidle_idx;
495 unsigned int wake_idx;
Nick Piggin147cbb42005-06-25 14:57:19 -0700496 unsigned int forkexec_idx;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700497 int flags; /* See SD_* */
498
499 /* Runtime fields. */
500 unsigned long last_balance; /* init to jiffies. units in jiffies */
501 unsigned int balance_interval; /* initialise to 1. units in ms. */
502 unsigned int nr_balance_failed; /* initialise to 0 */
503
504#ifdef CONFIG_SCHEDSTATS
505 /* load_balance() stats */
506 unsigned long lb_cnt[MAX_IDLE_TYPES];
507 unsigned long lb_failed[MAX_IDLE_TYPES];
508 unsigned long lb_balanced[MAX_IDLE_TYPES];
509 unsigned long lb_imbalance[MAX_IDLE_TYPES];
510 unsigned long lb_gained[MAX_IDLE_TYPES];
511 unsigned long lb_hot_gained[MAX_IDLE_TYPES];
512 unsigned long lb_nobusyg[MAX_IDLE_TYPES];
513 unsigned long lb_nobusyq[MAX_IDLE_TYPES];
514
515 /* Active load balancing */
516 unsigned long alb_cnt;
517 unsigned long alb_failed;
518 unsigned long alb_pushed;
519
Nick Piggin68767a02005-06-25 14:57:20 -0700520 /* SD_BALANCE_EXEC stats */
521 unsigned long sbe_cnt;
522 unsigned long sbe_balanced;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700523 unsigned long sbe_pushed;
524
Nick Piggin68767a02005-06-25 14:57:20 -0700525 /* SD_BALANCE_FORK stats */
526 unsigned long sbf_cnt;
527 unsigned long sbf_balanced;
528 unsigned long sbf_pushed;
529
Linus Torvalds1da177e2005-04-16 15:20:36 -0700530 /* try_to_wake_up() stats */
531 unsigned long ttwu_wake_remote;
532 unsigned long ttwu_move_affine;
533 unsigned long ttwu_move_balance;
534#endif
535};
536
537#ifdef ARCH_HAS_SCHED_DOMAIN
538/* Useful helpers that arch setup code may use. Defined in kernel/sched.c */
539extern cpumask_t cpu_isolated_map;
540extern void init_sched_build_groups(struct sched_group groups[],
541 cpumask_t span, int (*group_fn)(int cpu));
542extern void cpu_attach_domain(struct sched_domain *sd, int cpu);
543#endif /* ARCH_HAS_SCHED_DOMAIN */
544#endif /* CONFIG_SMP */
545
546
547struct io_context; /* See blkdev.h */
548void exit_io_context(void);
549struct cpuset;
550
551#define NGROUPS_SMALL 32
552#define NGROUPS_PER_BLOCK ((int)(PAGE_SIZE / sizeof(gid_t)))
553struct group_info {
554 int ngroups;
555 atomic_t usage;
556 gid_t small_block[NGROUPS_SMALL];
557 int nblocks;
558 gid_t *blocks[0];
559};
560
561/*
562 * get_group_info() must be called with the owning task locked (via task_lock())
563 * when task != current. The reason being that the vast majority of callers are
564 * looking at current->group_info, which can not be changed except by the
565 * current task. Changing current->group_info requires the task lock, too.
566 */
567#define get_group_info(group_info) do { \
568 atomic_inc(&(group_info)->usage); \
569} while (0)
570
571#define put_group_info(group_info) do { \
572 if (atomic_dec_and_test(&(group_info)->usage)) \
573 groups_free(group_info); \
574} while (0)
575
David Howells3e301482005-06-23 22:00:56 -0700576extern struct group_info *groups_alloc(int gidsetsize);
577extern void groups_free(struct group_info *group_info);
578extern int set_current_groups(struct group_info *group_info);
579extern int groups_search(struct group_info *group_info, gid_t grp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700580/* access the groups "array" with this macro */
581#define GROUP_AT(gi, i) \
582 ((gi)->blocks[(i)/NGROUPS_PER_BLOCK][(i)%NGROUPS_PER_BLOCK])
583
584
585struct audit_context; /* See audit.c */
586struct mempolicy;
587
588struct task_struct {
589 volatile long state; /* -1 unrunnable, 0 runnable, >0 stopped */
590 struct thread_info *thread_info;
591 atomic_t usage;
592 unsigned long flags; /* per process flags, defined below */
593 unsigned long ptrace;
594
Paolo 'Blaisorblade' Giarrusso36772092005-05-05 16:16:12 -0700595 int lock_depth; /* BKL lock depth */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700596
597 int prio, static_prio;
598 struct list_head run_list;
599 prio_array_t *array;
600
601 unsigned long sleep_avg;
602 unsigned long long timestamp, last_ran;
603 unsigned long long sched_time; /* sched_clock time spent running */
604 int activated;
605
606 unsigned long policy;
607 cpumask_t cpus_allowed;
608 unsigned int time_slice, first_time_slice;
609
610#ifdef CONFIG_SCHEDSTATS
611 struct sched_info sched_info;
612#endif
613
614 struct list_head tasks;
615 /*
616 * ptrace_list/ptrace_children forms the list of my children
617 * that were stolen by a ptracer.
618 */
619 struct list_head ptrace_children;
620 struct list_head ptrace_list;
621
622 struct mm_struct *mm, *active_mm;
623
624/* task state */
625 struct linux_binfmt *binfmt;
626 long exit_state;
627 int exit_code, exit_signal;
628 int pdeath_signal; /* The signal sent when the parent dies */
629 /* ??? */
630 unsigned long personality;
631 unsigned did_exec:1;
632 pid_t pid;
633 pid_t tgid;
634 /*
635 * pointers to (original) parent process, youngest child, younger sibling,
636 * older sibling, respectively. (p->father can be replaced with
637 * p->parent->pid)
638 */
639 struct task_struct *real_parent; /* real parent process (when being debugged) */
640 struct task_struct *parent; /* parent process */
641 /*
642 * children/sibling forms the list of my children plus the
643 * tasks I'm ptracing.
644 */
645 struct list_head children; /* list of my children */
646 struct list_head sibling; /* linkage in my parent's children list */
647 struct task_struct *group_leader; /* threadgroup leader */
648
649 /* PID/PID hash table linkage. */
650 struct pid pids[PIDTYPE_MAX];
651
652 struct completion *vfork_done; /* for vfork() */
653 int __user *set_child_tid; /* CLONE_CHILD_SETTID */
654 int __user *clear_child_tid; /* CLONE_CHILD_CLEARTID */
655
656 unsigned long rt_priority;
657 cputime_t utime, stime;
658 unsigned long nvcsw, nivcsw; /* context switch counts */
659 struct timespec start_time;
660/* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */
661 unsigned long min_flt, maj_flt;
662
663 cputime_t it_prof_expires, it_virt_expires;
664 unsigned long long it_sched_expires;
665 struct list_head cpu_timers[3];
666
667/* process credentials */
668 uid_t uid,euid,suid,fsuid;
669 gid_t gid,egid,sgid,fsgid;
670 struct group_info *group_info;
671 kernel_cap_t cap_effective, cap_inheritable, cap_permitted;
672 unsigned keep_capabilities:1;
673 struct user_struct *user;
674#ifdef CONFIG_KEYS
675 struct key *thread_keyring; /* keyring private to this thread */
David Howells3e301482005-06-23 22:00:56 -0700676 unsigned char jit_keyring; /* default keyring to attach requested keys to */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700677#endif
678 int oomkilladj; /* OOM kill score adjustment (bit shift). */
Paolo 'Blaisorblade' Giarrusso36772092005-05-05 16:16:12 -0700679 char comm[TASK_COMM_LEN]; /* executable name excluding path
680 - access with [gs]et_task_comm (which lock
681 it with task_lock())
682 - initialized normally by flush_old_exec */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700683/* file system info */
684 int link_count, total_link_count;
685/* ipc stuff */
686 struct sysv_sem sysvsem;
687/* CPU-specific state of this task */
688 struct thread_struct thread;
689/* filesystem information */
690 struct fs_struct *fs;
691/* open file information */
692 struct files_struct *files;
693/* namespace */
694 struct namespace *namespace;
695/* signal handlers */
696 struct signal_struct *signal;
697 struct sighand_struct *sighand;
698
699 sigset_t blocked, real_blocked;
700 struct sigpending pending;
701
702 unsigned long sas_ss_sp;
703 size_t sas_ss_size;
704 int (*notifier)(void *priv);
705 void *notifier_data;
706 sigset_t *notifier_mask;
707
708 void *security;
709 struct audit_context *audit_context;
710 seccomp_t seccomp;
711
712/* Thread group tracking */
713 u32 parent_exec_id;
714 u32 self_exec_id;
715/* Protection of (de-)allocation: mm, files, fs, tty, keyrings */
716 spinlock_t alloc_lock;
717/* Protection of proc_dentry: nesting proc_lock, dcache_lock, write_lock_irq(&tasklist_lock); */
718 spinlock_t proc_lock;
719/* context-switch lock */
720 spinlock_t switch_lock;
721
722/* journalling filesystem info */
723 void *journal_info;
724
725/* VM state */
726 struct reclaim_state *reclaim_state;
727
728 struct dentry *proc_dentry;
729 struct backing_dev_info *backing_dev_info;
730
731 struct io_context *io_context;
732
733 unsigned long ptrace_message;
734 siginfo_t *last_siginfo; /* For ptrace use. */
735/*
736 * current io wait handle: wait queue entry to use for io waits
737 * If this thread is processing aio, this points at the waitqueue
738 * inside the currently handled kiocb. It may be NULL (i.e. default
739 * to a stack based synchronous wait) if its doing sync IO.
740 */
741 wait_queue_t *io_wait;
742/* i/o counters(bytes read/written, #syscalls */
743 u64 rchar, wchar, syscr, syscw;
744#if defined(CONFIG_BSD_PROCESS_ACCT)
745 u64 acct_rss_mem1; /* accumulated rss usage */
746 u64 acct_vm_mem1; /* accumulated virtual memory usage */
747 clock_t acct_stimexpd; /* clock_t-converted stime since last update */
748#endif
749#ifdef CONFIG_NUMA
750 struct mempolicy *mempolicy;
751 short il_next;
752#endif
753#ifdef CONFIG_CPUSETS
754 struct cpuset *cpuset;
755 nodemask_t mems_allowed;
756 int cpuset_mems_generation;
757#endif
758};
759
760static inline pid_t process_group(struct task_struct *tsk)
761{
762 return tsk->signal->pgrp;
763}
764
765/**
766 * pid_alive - check that a task structure is not stale
767 * @p: Task structure to be checked.
768 *
769 * Test if a process is not yet dead (at most zombie state)
770 * If pid_alive fails, then pointers within the task structure
771 * can be stale and must not be dereferenced.
772 */
773static inline int pid_alive(struct task_struct *p)
774{
775 return p->pids[PIDTYPE_PID].nr != 0;
776}
777
778extern void free_task(struct task_struct *tsk);
779extern void __put_task_struct(struct task_struct *tsk);
780#define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0)
781#define put_task_struct(tsk) \
782do { if (atomic_dec_and_test(&(tsk)->usage)) __put_task_struct(tsk); } while(0)
783
784/*
785 * Per process flags
786 */
787#define PF_ALIGNWARN 0x00000001 /* Print alignment warning msgs */
788 /* Not implemented yet, only for 486*/
789#define PF_STARTING 0x00000002 /* being created */
790#define PF_EXITING 0x00000004 /* getting shut down */
791#define PF_DEAD 0x00000008 /* Dead */
792#define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */
793#define PF_SUPERPRIV 0x00000100 /* used super-user privileges */
794#define PF_DUMPCORE 0x00000200 /* dumped core */
795#define PF_SIGNALED 0x00000400 /* killed by a signal */
796#define PF_MEMALLOC 0x00000800 /* Allocating memory */
797#define PF_FLUSHER 0x00001000 /* responsible for disk writeback */
798#define PF_USED_MATH 0x00002000 /* if unset the fpu must be initialized before use */
799#define PF_FREEZE 0x00004000 /* this task is being frozen for suspend now */
800#define PF_NOFREEZE 0x00008000 /* this thread should not be frozen */
801#define PF_FROZEN 0x00010000 /* frozen for system suspend */
802#define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */
803#define PF_KSWAPD 0x00040000 /* I am kswapd */
804#define PF_SWAPOFF 0x00080000 /* I am in swapoff */
805#define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */
806#define PF_SYNCWRITE 0x00200000 /* I am doing a sync write */
807#define PF_BORROWED_MM 0x00400000 /* I am a kthread doing use_mm */
808#define PF_RANDOMIZE 0x00800000 /* randomize virtual address space */
809
810/*
811 * Only the _current_ task can read/write to tsk->flags, but other
812 * tasks can access tsk->flags in readonly mode for example
813 * with tsk_used_math (like during threaded core dumping).
814 * There is however an exception to this rule during ptrace
815 * or during fork: the ptracer task is allowed to write to the
816 * child->flags of its traced child (same goes for fork, the parent
817 * can write to the child->flags), because we're guaranteed the
818 * child is not running and in turn not changing child->flags
819 * at the same time the parent does it.
820 */
821#define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0)
822#define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0)
823#define clear_used_math() clear_stopped_child_used_math(current)
824#define set_used_math() set_stopped_child_used_math(current)
825#define conditional_stopped_child_used_math(condition, child) \
826 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0)
827#define conditional_used_math(condition) \
828 conditional_stopped_child_used_math(condition, current)
829#define copy_to_stopped_child_used_math(child) \
830 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0)
831/* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */
832#define tsk_used_math(p) ((p)->flags & PF_USED_MATH)
833#define used_math() tsk_used_math(current)
834
835#ifdef CONFIG_SMP
836extern int set_cpus_allowed(task_t *p, cpumask_t new_mask);
837#else
838static inline int set_cpus_allowed(task_t *p, cpumask_t new_mask)
839{
840 if (!cpus_intersects(new_mask, cpu_online_map))
841 return -EINVAL;
842 return 0;
843}
844#endif
845
846extern unsigned long long sched_clock(void);
847extern unsigned long long current_sched_time(const task_t *current_task);
848
849/* sched_exec is called by processes performing an exec */
850#ifdef CONFIG_SMP
851extern void sched_exec(void);
852#else
853#define sched_exec() {}
854#endif
855
856#ifdef CONFIG_HOTPLUG_CPU
857extern void idle_task_exit(void);
858#else
859static inline void idle_task_exit(void) {}
860#endif
861
862extern void sched_idle_next(void);
863extern void set_user_nice(task_t *p, long nice);
864extern int task_prio(const task_t *p);
865extern int task_nice(const task_t *p);
Matt Mackalle43379f2005-05-01 08:59:00 -0700866extern int can_nice(const task_t *p, const int nice);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700867extern int task_curr(const task_t *p);
868extern int idle_cpu(int cpu);
869extern int sched_setscheduler(struct task_struct *, int, struct sched_param *);
870extern task_t *idle_task(int cpu);
871
872void yield(void);
873
874/*
875 * The default (Linux) execution domain.
876 */
877extern struct exec_domain default_exec_domain;
878
879union thread_union {
880 struct thread_info thread_info;
881 unsigned long stack[THREAD_SIZE/sizeof(long)];
882};
883
884#ifndef __HAVE_ARCH_KSTACK_END
885static inline int kstack_end(void *addr)
886{
887 /* Reliable end of stack detection:
888 * Some APM bios versions misalign the stack
889 */
890 return !(((unsigned long)addr+sizeof(void*)-1) & (THREAD_SIZE-sizeof(void*)));
891}
892#endif
893
894extern union thread_union init_thread_union;
895extern struct task_struct init_task;
896
897extern struct mm_struct init_mm;
898
899#define find_task_by_pid(nr) find_task_by_pid_type(PIDTYPE_PID, nr)
900extern struct task_struct *find_task_by_pid_type(int type, int pid);
901extern void set_special_pids(pid_t session, pid_t pgrp);
902extern void __set_special_pids(pid_t session, pid_t pgrp);
903
904/* per-UID process charging. */
905extern struct user_struct * alloc_uid(uid_t);
906static inline struct user_struct *get_uid(struct user_struct *u)
907{
908 atomic_inc(&u->__count);
909 return u;
910}
911extern void free_uid(struct user_struct *);
912extern void switch_uid(struct user_struct *);
913
914#include <asm/current.h>
915
916extern void do_timer(struct pt_regs *);
917
918extern int FASTCALL(wake_up_state(struct task_struct * tsk, unsigned int state));
919extern int FASTCALL(wake_up_process(struct task_struct * tsk));
920extern void FASTCALL(wake_up_new_task(struct task_struct * tsk,
921 unsigned long clone_flags));
922#ifdef CONFIG_SMP
923 extern void kick_process(struct task_struct *tsk);
924#else
925 static inline void kick_process(struct task_struct *tsk) { }
926#endif
927extern void FASTCALL(sched_fork(task_t * p));
928extern void FASTCALL(sched_exit(task_t * p));
929
930extern int in_group_p(gid_t);
931extern int in_egroup_p(gid_t);
932
933extern void proc_caches_init(void);
934extern void flush_signals(struct task_struct *);
935extern void flush_signal_handlers(struct task_struct *, int force_default);
936extern int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info);
937
938static inline int dequeue_signal_lock(struct task_struct *tsk, sigset_t *mask, siginfo_t *info)
939{
940 unsigned long flags;
941 int ret;
942
943 spin_lock_irqsave(&tsk->sighand->siglock, flags);
944 ret = dequeue_signal(tsk, mask, info);
945 spin_unlock_irqrestore(&tsk->sighand->siglock, flags);
946
947 return ret;
948}
949
950extern void block_all_signals(int (*notifier)(void *priv), void *priv,
951 sigset_t *mask);
952extern void unblock_all_signals(void);
953extern void release_task(struct task_struct * p);
954extern int send_sig_info(int, struct siginfo *, struct task_struct *);
955extern int send_group_sig_info(int, struct siginfo *, struct task_struct *);
956extern int force_sigsegv(int, struct task_struct *);
957extern int force_sig_info(int, struct siginfo *, struct task_struct *);
958extern int __kill_pg_info(int sig, struct siginfo *info, pid_t pgrp);
959extern int kill_pg_info(int, struct siginfo *, pid_t);
960extern int kill_proc_info(int, struct siginfo *, pid_t);
961extern void do_notify_parent(struct task_struct *, int);
962extern void force_sig(int, struct task_struct *);
963extern void force_sig_specific(int, struct task_struct *);
964extern int send_sig(int, struct task_struct *, int);
965extern void zap_other_threads(struct task_struct *p);
966extern int kill_pg(pid_t, int, int);
967extern int kill_sl(pid_t, int, int);
968extern int kill_proc(pid_t, int, int);
969extern struct sigqueue *sigqueue_alloc(void);
970extern void sigqueue_free(struct sigqueue *);
971extern int send_sigqueue(int, struct sigqueue *, struct task_struct *);
972extern int send_group_sigqueue(int, struct sigqueue *, struct task_struct *);
973extern int do_sigaction(int, const struct k_sigaction *, struct k_sigaction *);
974extern int do_sigaltstack(const stack_t __user *, stack_t __user *, unsigned long);
975
976/* These can be the second arg to send_sig_info/send_group_sig_info. */
977#define SEND_SIG_NOINFO ((struct siginfo *) 0)
978#define SEND_SIG_PRIV ((struct siginfo *) 1)
979#define SEND_SIG_FORCED ((struct siginfo *) 2)
980
981/* True if we are on the alternate signal stack. */
982
983static inline int on_sig_stack(unsigned long sp)
984{
985 return (sp - current->sas_ss_sp < current->sas_ss_size);
986}
987
988static inline int sas_ss_flags(unsigned long sp)
989{
990 return (current->sas_ss_size == 0 ? SS_DISABLE
991 : on_sig_stack(sp) ? SS_ONSTACK : 0);
992}
993
994
995#ifdef CONFIG_SECURITY
996/* code is in security.c */
997extern int capable(int cap);
998#else
999static inline int capable(int cap)
1000{
1001 if (cap_raised(current->cap_effective, cap)) {
1002 current->flags |= PF_SUPERPRIV;
1003 return 1;
1004 }
1005 return 0;
1006}
1007#endif
1008
1009/*
1010 * Routines for handling mm_structs
1011 */
1012extern struct mm_struct * mm_alloc(void);
1013
1014/* mmdrop drops the mm and the page tables */
1015extern void FASTCALL(__mmdrop(struct mm_struct *));
1016static inline void mmdrop(struct mm_struct * mm)
1017{
1018 if (atomic_dec_and_test(&mm->mm_count))
1019 __mmdrop(mm);
1020}
1021
1022/* mmput gets rid of the mappings and all user-space */
1023extern void mmput(struct mm_struct *);
1024/* Grab a reference to a task's mm, if it is not already going away */
1025extern struct mm_struct *get_task_mm(struct task_struct *task);
1026/* Remove the current tasks stale references to the old mm_struct */
1027extern void mm_release(struct task_struct *, struct mm_struct *);
1028
1029extern int copy_thread(int, unsigned long, unsigned long, unsigned long, struct task_struct *, struct pt_regs *);
1030extern void flush_thread(void);
1031extern void exit_thread(void);
1032
Linus Torvalds1da177e2005-04-16 15:20:36 -07001033extern void exit_files(struct task_struct *);
1034extern void exit_signal(struct task_struct *);
1035extern void __exit_signal(struct task_struct *);
1036extern void exit_sighand(struct task_struct *);
1037extern void __exit_sighand(struct task_struct *);
1038extern void exit_itimers(struct signal_struct *);
1039
1040extern NORET_TYPE void do_group_exit(int);
1041
Linus Torvalds1da177e2005-04-16 15:20:36 -07001042extern void daemonize(const char *, ...);
1043extern int allow_signal(int);
1044extern int disallow_signal(int);
1045extern task_t *child_reaper;
1046
1047extern int do_execve(char *, char __user * __user *, char __user * __user *, struct pt_regs *);
1048extern long do_fork(unsigned long, unsigned long, struct pt_regs *, unsigned long, int __user *, int __user *);
1049task_t *fork_idle(int);
1050
1051extern void set_task_comm(struct task_struct *tsk, char *from);
1052extern void get_task_comm(char *to, struct task_struct *tsk);
1053
1054#ifdef CONFIG_SMP
1055extern void wait_task_inactive(task_t * p);
1056#else
1057#define wait_task_inactive(p) do { } while (0)
1058#endif
1059
1060#define remove_parent(p) list_del_init(&(p)->sibling)
1061#define add_parent(p, parent) list_add_tail(&(p)->sibling,&(parent)->children)
1062
1063#define REMOVE_LINKS(p) do { \
1064 if (thread_group_leader(p)) \
1065 list_del_init(&(p)->tasks); \
1066 remove_parent(p); \
1067 } while (0)
1068
1069#define SET_LINKS(p) do { \
1070 if (thread_group_leader(p)) \
1071 list_add_tail(&(p)->tasks,&init_task.tasks); \
1072 add_parent(p, (p)->parent); \
1073 } while (0)
1074
1075#define next_task(p) list_entry((p)->tasks.next, struct task_struct, tasks)
1076#define prev_task(p) list_entry((p)->tasks.prev, struct task_struct, tasks)
1077
1078#define for_each_process(p) \
1079 for (p = &init_task ; (p = next_task(p)) != &init_task ; )
1080
1081/*
1082 * Careful: do_each_thread/while_each_thread is a double loop so
1083 * 'break' will not work as expected - use goto instead.
1084 */
1085#define do_each_thread(g, t) \
1086 for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do
1087
1088#define while_each_thread(g, t) \
1089 while ((t = next_thread(t)) != g)
1090
1091extern task_t * FASTCALL(next_thread(const task_t *p));
1092
1093#define thread_group_leader(p) (p->pid == p->tgid)
1094
1095static inline int thread_group_empty(task_t *p)
1096{
1097 return list_empty(&p->pids[PIDTYPE_TGID].pid_list);
1098}
1099
1100#define delay_group_leader(p) \
1101 (thread_group_leader(p) && !thread_group_empty(p))
1102
1103extern void unhash_process(struct task_struct *p);
1104
1105/*
1106 * Protects ->fs, ->files, ->mm, ->ptrace, ->group_info, ->comm, keyring
1107 * subscriptions and synchronises with wait4(). Also used in procfs.
1108 *
1109 * Nests both inside and outside of read_lock(&tasklist_lock).
1110 * It must not be nested with write_lock_irq(&tasklist_lock),
1111 * neither inside nor outside.
1112 */
1113static inline void task_lock(struct task_struct *p)
1114{
1115 spin_lock(&p->alloc_lock);
1116}
1117
1118static inline void task_unlock(struct task_struct *p)
1119{
1120 spin_unlock(&p->alloc_lock);
1121}
1122
1123/* set thread flags in other task's structures
1124 * - see asm/thread_info.h for TIF_xxxx flags available
1125 */
1126static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag)
1127{
1128 set_ti_thread_flag(tsk->thread_info,flag);
1129}
1130
1131static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag)
1132{
1133 clear_ti_thread_flag(tsk->thread_info,flag);
1134}
1135
1136static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag)
1137{
1138 return test_and_set_ti_thread_flag(tsk->thread_info,flag);
1139}
1140
1141static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag)
1142{
1143 return test_and_clear_ti_thread_flag(tsk->thread_info,flag);
1144}
1145
1146static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag)
1147{
1148 return test_ti_thread_flag(tsk->thread_info,flag);
1149}
1150
1151static inline void set_tsk_need_resched(struct task_struct *tsk)
1152{
1153 set_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
1154}
1155
1156static inline void clear_tsk_need_resched(struct task_struct *tsk)
1157{
1158 clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
1159}
1160
1161static inline int signal_pending(struct task_struct *p)
1162{
1163 return unlikely(test_tsk_thread_flag(p,TIF_SIGPENDING));
1164}
1165
1166static inline int need_resched(void)
1167{
1168 return unlikely(test_thread_flag(TIF_NEED_RESCHED));
1169}
1170
1171/*
1172 * cond_resched() and cond_resched_lock(): latency reduction via
1173 * explicit rescheduling in places that are safe. The return
1174 * value indicates whether a reschedule was done in fact.
1175 * cond_resched_lock() will drop the spinlock before scheduling,
1176 * cond_resched_softirq() will enable bhs before scheduling.
1177 */
1178extern int cond_resched(void);
1179extern int cond_resched_lock(spinlock_t * lock);
1180extern int cond_resched_softirq(void);
1181
1182/*
1183 * Does a critical section need to be broken due to another
1184 * task waiting?:
1185 */
1186#if defined(CONFIG_PREEMPT) && defined(CONFIG_SMP)
1187# define need_lockbreak(lock) ((lock)->break_lock)
1188#else
1189# define need_lockbreak(lock) 0
1190#endif
1191
1192/*
1193 * Does a critical section need to be broken due to another
1194 * task waiting or preemption being signalled:
1195 */
1196static inline int lock_need_resched(spinlock_t *lock)
1197{
1198 if (need_lockbreak(lock) || need_resched())
1199 return 1;
1200 return 0;
1201}
1202
1203/* Reevaluate whether the task has signals pending delivery.
1204 This is required every time the blocked sigset_t changes.
1205 callers must hold sighand->siglock. */
1206
1207extern FASTCALL(void recalc_sigpending_tsk(struct task_struct *t));
1208extern void recalc_sigpending(void);
1209
1210extern void signal_wake_up(struct task_struct *t, int resume_stopped);
1211
1212/*
1213 * Wrappers for p->thread_info->cpu access. No-op on UP.
1214 */
1215#ifdef CONFIG_SMP
1216
1217static inline unsigned int task_cpu(const struct task_struct *p)
1218{
1219 return p->thread_info->cpu;
1220}
1221
1222static inline void set_task_cpu(struct task_struct *p, unsigned int cpu)
1223{
1224 p->thread_info->cpu = cpu;
1225}
1226
1227#else
1228
1229static inline unsigned int task_cpu(const struct task_struct *p)
1230{
1231 return 0;
1232}
1233
1234static inline void set_task_cpu(struct task_struct *p, unsigned int cpu)
1235{
1236}
1237
1238#endif /* CONFIG_SMP */
1239
1240#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1241extern void arch_pick_mmap_layout(struct mm_struct *mm);
1242#else
1243static inline void arch_pick_mmap_layout(struct mm_struct *mm)
1244{
1245 mm->mmap_base = TASK_UNMAPPED_BASE;
1246 mm->get_unmapped_area = arch_get_unmapped_area;
1247 mm->unmap_area = arch_unmap_area;
1248}
1249#endif
1250
1251extern long sched_setaffinity(pid_t pid, cpumask_t new_mask);
1252extern long sched_getaffinity(pid_t pid, cpumask_t *mask);
1253
1254#ifdef CONFIG_MAGIC_SYSRQ
1255
1256extern void normalize_rt_tasks(void);
1257
1258#endif
1259
1260/* try_to_freeze
1261 *
1262 * Checks whether we need to enter the refrigerator
1263 * and returns 1 if we did so.
1264 */
1265#ifdef CONFIG_PM
1266extern void refrigerator(unsigned long);
1267extern int freeze_processes(void);
1268extern void thaw_processes(void);
1269
1270static inline int try_to_freeze(unsigned long refrigerator_flags)
1271{
1272 if (unlikely(current->flags & PF_FREEZE)) {
1273 refrigerator(refrigerator_flags);
1274 return 1;
1275 } else
1276 return 0;
1277}
1278#else
1279static inline void refrigerator(unsigned long flag) {}
1280static inline int freeze_processes(void) { BUG(); return 0; }
1281static inline void thaw_processes(void) {}
1282
1283static inline int try_to_freeze(unsigned long refrigerator_flags)
1284{
1285 return 0;
1286}
1287#endif /* CONFIG_PM */
1288#endif /* __KERNEL__ */
1289
1290#endif