4 #include <asm/param.h> /* for HZ */
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>
19 #include <asm/system.h>
20 #include <asm/semaphore.h>
22 #include <asm/ptrace.h>
24 #include <asm/cputime.h>
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 #include <linux/rcupdate.h>
38 #include <linux/futex.h>
40 #include <linux/auxvec.h> /* For AT_VECTOR_SIZE */
47 #define CSIGNAL 0x000000ff /* signal mask to be sent at exit */
48 #define CLONE_VM 0x00000100 /* set if VM shared between processes */
49 #define CLONE_FS 0x00000200 /* set if fs info shared between processes */
50 #define CLONE_FILES 0x00000400 /* set if open files shared between processes */
51 #define CLONE_SIGHAND 0x00000800 /* set if signal handlers and blocked signals shared */
52 #define CLONE_PTRACE 0x00002000 /* set if we want to let tracing continue on the child too */
53 #define CLONE_VFORK 0x00004000 /* set if the parent wants the child to wake it up on mm_release */
54 #define CLONE_PARENT 0x00008000 /* set if we want to have the same parent as the cloner */
55 #define CLONE_THREAD 0x00010000 /* Same thread group? */
56 #define CLONE_NEWNS 0x00020000 /* New namespace group? */
57 #define CLONE_SYSVSEM 0x00040000 /* share system V SEM_UNDO semantics */
58 #define CLONE_SETTLS 0x00080000 /* create a new TLS for the child */
59 #define CLONE_PARENT_SETTID 0x00100000 /* set the TID in the parent */
60 #define CLONE_CHILD_CLEARTID 0x00200000 /* clear the TID in the child */
61 #define CLONE_DETACHED 0x00400000 /* Unused, ignored */
62 #define CLONE_UNTRACED 0x00800000 /* set if the tracing process can't force CLONE_PTRACE on this clone */
63 #define CLONE_CHILD_SETTID 0x01000000 /* set the TID in the child */
64 #define CLONE_STOPPED 0x02000000 /* Start in stopped state */
67 * List of flags we want to share for kernel threads,
68 * if only because they are not used by them anyway.
70 #define CLONE_KERNEL (CLONE_FS | CLONE_FILES | CLONE_SIGHAND)
73 * These are the constant used to fake the fixed-point load-average
74 * counting. Some notes:
75 * - 11 bit fractions expand to 22 bits by the multiplies: this gives
76 * a load-average precision of 10 bits integer + 11 bits fractional
77 * - if you want to count load-averages more often, you need more
78 * precision, or rounding will get you. With 2-second counting freq,
79 * the EXP_n values would be 1981, 2034 and 2043 if still using only
82 extern unsigned long avenrun
[]; /* Load averages */
84 #define FSHIFT 11 /* nr of bits of precision */
85 #define FIXED_1 (1<<FSHIFT) /* 1.0 as fixed-point */
86 #define LOAD_FREQ (5*HZ) /* 5 sec intervals */
87 #define EXP_1 1884 /* 1/exp(5sec/1min) as fixed-point */
88 #define EXP_5 2014 /* 1/exp(5sec/5min) */
89 #define EXP_15 2037 /* 1/exp(5sec/15min) */
91 #define CALC_LOAD(load,exp,n) \
93 load += n*(FIXED_1-exp); \
96 extern unsigned long total_forks
;
97 extern int nr_threads
;
99 DECLARE_PER_CPU(unsigned long, process_counts
);
100 extern int nr_processes(void);
101 extern unsigned long nr_running(void);
102 extern unsigned long nr_uninterruptible(void);
103 extern unsigned long nr_active(void);
104 extern unsigned long nr_iowait(void);
106 #include <linux/time.h>
107 #include <linux/param.h>
108 #include <linux/resource.h>
109 #include <linux/timer.h>
110 #include <linux/hrtimer.h>
112 #include <asm/processor.h>
115 * Task state bitmask. NOTE! These bits are also
116 * encoded in fs/proc/array.c: get_task_state().
118 * We have two separate sets of flags: task->state
119 * is about runnability, while task->exit_state are
120 * about the task exiting. Confusing, but this way
121 * modifying one set can't modify the other one by
124 #define TASK_RUNNING 0
125 #define TASK_INTERRUPTIBLE 1
126 #define TASK_UNINTERRUPTIBLE 2
127 #define TASK_STOPPED 4
128 #define TASK_TRACED 8
129 /* in tsk->exit_state */
130 #define EXIT_ZOMBIE 16
132 /* in tsk->state again */
133 #define TASK_NONINTERACTIVE 64
135 #define __set_task_state(tsk, state_value) \
136 do { (tsk)->state = (state_value); } while (0)
137 #define set_task_state(tsk, state_value) \
138 set_mb((tsk)->state, (state_value))
141 * set_current_state() includes a barrier so that the write of current->state
142 * is correctly serialised wrt the caller's subsequent test of whether to
145 * set_current_state(TASK_UNINTERRUPTIBLE);
146 * if (do_i_need_to_sleep())
149 * If the caller does not need such serialisation then use __set_current_state()
151 #define __set_current_state(state_value) \
152 do { current->state = (state_value); } while (0)
153 #define set_current_state(state_value) \
154 set_mb(current->state, (state_value))
156 /* Task command name length */
157 #define TASK_COMM_LEN 16
160 * Scheduling policies
162 #define SCHED_NORMAL 0
165 #define SCHED_BATCH 3
173 #include <linux/spinlock.h>
176 * This serializes "schedule()" and also protects
177 * the run-queue from deletions/modifications (but
178 * _adding_ to the beginning of the run-queue has
181 extern rwlock_t tasklist_lock
;
182 extern spinlock_t mmlist_lock
;
184 typedef struct task_struct task_t
;
186 extern void sched_init(void);
187 extern void sched_init_smp(void);
188 extern void init_idle(task_t
*idle
, int cpu
);
190 extern cpumask_t nohz_cpu_mask
;
192 extern void show_state(void);
193 extern void show_regs(struct pt_regs
*);
196 * TASK is a pointer to the task whose backtrace we want to see (or NULL for current
197 * task), SP is the stack pointer of the first frame that should be shown in the back
198 * trace (or NULL if the entire call-chain of the task should be shown).
200 extern void show_stack(struct task_struct
*task
, unsigned long *sp
);
202 void io_schedule(void);
203 long io_schedule_timeout(long timeout
);
205 extern void cpu_init (void);
206 extern void trap_init(void);
207 extern void update_process_times(int user
);
208 extern void scheduler_tick(void);
210 #ifdef CONFIG_DETECT_SOFTLOCKUP
211 extern void softlockup_tick(void);
212 extern void spawn_softlockup_task(void);
213 extern void touch_softlockup_watchdog(void);
215 static inline void softlockup_tick(void)
218 static inline void spawn_softlockup_task(void)
221 static inline void touch_softlockup_watchdog(void)
227 /* Attach to any functions which should be ignored in wchan output. */
228 #define __sched __attribute__((__section__(".sched.text")))
229 /* Is this address in the __sched functions? */
230 extern int in_sched_functions(unsigned long addr
);
232 #define MAX_SCHEDULE_TIMEOUT LONG_MAX
233 extern signed long FASTCALL(schedule_timeout(signed long timeout
));
234 extern signed long schedule_timeout_interruptible(signed long timeout
);
235 extern signed long schedule_timeout_uninterruptible(signed long timeout
);
236 asmlinkage
void schedule(void);
240 /* Maximum number of active map areas.. This is a random (large) number */
241 #define DEFAULT_MAX_MAP_COUNT 65536
243 extern int sysctl_max_map_count
;
245 #include <linux/aio.h>
248 arch_get_unmapped_area(struct file
*, unsigned long, unsigned long,
249 unsigned long, unsigned long);
251 arch_get_unmapped_area_topdown(struct file
*filp
, unsigned long addr
,
252 unsigned long len
, unsigned long pgoff
,
253 unsigned long flags
);
254 extern void arch_unmap_area(struct mm_struct
*, unsigned long);
255 extern void arch_unmap_area_topdown(struct mm_struct
*, unsigned long);
257 #if NR_CPUS >= CONFIG_SPLIT_PTLOCK_CPUS
259 * The mm counters are not protected by its page_table_lock,
260 * so must be incremented atomically.
262 #define set_mm_counter(mm, member, value) atomic_long_set(&(mm)->_##member, value)
263 #define get_mm_counter(mm, member) ((unsigned long)atomic_long_read(&(mm)->_##member))
264 #define add_mm_counter(mm, member, value) atomic_long_add(value, &(mm)->_##member)
265 #define inc_mm_counter(mm, member) atomic_long_inc(&(mm)->_##member)
266 #define dec_mm_counter(mm, member) atomic_long_dec(&(mm)->_##member)
267 typedef atomic_long_t mm_counter_t
;
269 #else /* NR_CPUS < CONFIG_SPLIT_PTLOCK_CPUS */
271 * The mm counters are protected by its page_table_lock,
272 * so can be incremented directly.
274 #define set_mm_counter(mm, member, value) (mm)->_##member = (value)
275 #define get_mm_counter(mm, member) ((mm)->_##member)
276 #define add_mm_counter(mm, member, value) (mm)->_##member += (value)
277 #define inc_mm_counter(mm, member) (mm)->_##member++
278 #define dec_mm_counter(mm, member) (mm)->_##member--
279 typedef unsigned long mm_counter_t
;
281 #endif /* NR_CPUS < CONFIG_SPLIT_PTLOCK_CPUS */
283 #define get_mm_rss(mm) \
284 (get_mm_counter(mm, file_rss) + get_mm_counter(mm, anon_rss))
285 #define update_hiwater_rss(mm) do { \
286 unsigned long _rss = get_mm_rss(mm); \
287 if ((mm)->hiwater_rss < _rss) \
288 (mm)->hiwater_rss = _rss; \
290 #define update_hiwater_vm(mm) do { \
291 if ((mm)->hiwater_vm < (mm)->total_vm) \
292 (mm)->hiwater_vm = (mm)->total_vm; \
296 struct vm_area_struct
* mmap
; /* list of VMAs */
297 struct rb_root mm_rb
;
298 struct vm_area_struct
* mmap_cache
; /* last find_vma result */
299 unsigned long (*get_unmapped_area
) (struct file
*filp
,
300 unsigned long addr
, unsigned long len
,
301 unsigned long pgoff
, unsigned long flags
);
302 void (*unmap_area
) (struct mm_struct
*mm
, unsigned long addr
);
303 unsigned long mmap_base
; /* base of mmap area */
304 unsigned long task_size
; /* size of task vm space */
305 unsigned long cached_hole_size
; /* if non-zero, the largest hole below free_area_cache */
306 unsigned long free_area_cache
; /* first hole of size cached_hole_size or larger */
308 atomic_t mm_users
; /* How many users with user space? */
309 atomic_t mm_count
; /* How many references to "struct mm_struct" (users count as 1) */
310 int map_count
; /* number of VMAs */
311 struct rw_semaphore mmap_sem
;
312 spinlock_t page_table_lock
; /* Protects page tables and some counters */
314 struct list_head mmlist
; /* List of maybe swapped mm's. These are globally strung
315 * together off init_mm.mmlist, and are protected
319 /* Special counters, in some configurations protected by the
320 * page_table_lock, in other configurations by being atomic.
322 mm_counter_t _file_rss
;
323 mm_counter_t _anon_rss
;
325 unsigned long hiwater_rss
; /* High-watermark of RSS usage */
326 unsigned long hiwater_vm
; /* High-water virtual memory usage */
328 unsigned long total_vm
, locked_vm
, shared_vm
, exec_vm
;
329 unsigned long stack_vm
, reserved_vm
, def_flags
, nr_ptes
;
330 unsigned long start_code
, end_code
, start_data
, end_data
;
331 unsigned long start_brk
, brk
, start_stack
;
332 unsigned long arg_start
, arg_end
, env_start
, env_end
;
334 unsigned long saved_auxv
[AT_VECTOR_SIZE
]; /* for /proc/PID/auxv */
337 cpumask_t cpu_vm_mask
;
339 /* Architecture-specific MM context */
340 mm_context_t context
;
342 /* Token based thrashing protection. */
343 unsigned long swap_token_time
;
346 /* coredumping support */
348 struct completion
*core_startup_done
, core_done
;
351 rwlock_t ioctx_list_lock
;
352 struct kioctx
*ioctx_list
;
355 struct sighand_struct
{
357 struct k_sigaction action
[_NSIG
];
362 * NOTE! "signal_struct" does not have it's own
363 * locking, because a shared signal_struct always
364 * implies a shared sighand_struct, so locking
365 * sighand_struct is always a proper superset of
366 * the locking of signal_struct.
368 struct signal_struct
{
372 wait_queue_head_t wait_chldexit
; /* for wait4() */
374 /* current thread group signal load-balancing target: */
377 /* shared signal handling: */
378 struct sigpending shared_pending
;
380 /* thread group exit support */
383 * - notify group_exit_task when ->count is equal to notify_count
384 * - everyone except group_exit_task is stopped during signal delivery
385 * of fatal signals, group_exit_task processes the signal.
387 struct task_struct
*group_exit_task
;
390 /* thread group stop support, overloads group_exit_code too */
391 int group_stop_count
;
392 unsigned int flags
; /* see SIGNAL_* flags below */
394 /* POSIX.1b Interval Timers */
395 struct list_head posix_timers
;
397 /* ITIMER_REAL timer for the process */
398 struct hrtimer real_timer
;
399 struct task_struct
*tsk
;
400 ktime_t it_real_incr
;
402 /* ITIMER_PROF and ITIMER_VIRTUAL timers for the process */
403 cputime_t it_prof_expires
, it_virt_expires
;
404 cputime_t it_prof_incr
, it_virt_incr
;
406 /* job control IDs */
410 /* boolean value for session group leader */
413 struct tty_struct
*tty
; /* NULL if no tty */
416 * Cumulative resource counters for dead threads in the group,
417 * and for reaped dead child processes forked by this group.
418 * Live threads maintain their own counters and add to these
419 * in __exit_signal, except for the group leader.
421 cputime_t utime
, stime
, cutime
, cstime
;
422 unsigned long nvcsw
, nivcsw
, cnvcsw
, cnivcsw
;
423 unsigned long min_flt
, maj_flt
, cmin_flt
, cmaj_flt
;
426 * Cumulative ns of scheduled CPU time for dead threads in the
427 * group, not including a zombie group leader. (This only differs
428 * from jiffies_to_ns(utime + stime) if sched_clock uses something
429 * other than jiffies.)
431 unsigned long long sched_time
;
434 * We don't bother to synchronize most readers of this at all,
435 * because there is no reader checking a limit that actually needs
436 * to get both rlim_cur and rlim_max atomically, and either one
437 * alone is a single word that can safely be read normally.
438 * getrlimit/setrlimit use task_lock(current->group_leader) to
439 * protect this instead of the siglock, because they really
440 * have no need to disable irqs.
442 struct rlimit rlim
[RLIM_NLIMITS
];
444 struct list_head cpu_timers
[3];
446 /* keep the process-shared keyrings here so that they do the right
447 * thing in threads created with CLONE_THREAD */
449 struct key
*session_keyring
; /* keyring inherited over fork */
450 struct key
*process_keyring
; /* keyring private to this process */
454 /* Context switch must be unlocked if interrupts are to be enabled */
455 #ifdef __ARCH_WANT_INTERRUPTS_ON_CTXSW
456 # define __ARCH_WANT_UNLOCKED_CTXSW
460 * Bits in flags field of signal_struct.
462 #define SIGNAL_STOP_STOPPED 0x00000001 /* job control stop in effect */
463 #define SIGNAL_STOP_DEQUEUED 0x00000002 /* stop signal dequeued */
464 #define SIGNAL_STOP_CONTINUED 0x00000004 /* SIGCONT since WCONTINUED reap */
465 #define SIGNAL_GROUP_EXIT 0x00000008 /* group exit in progress */
469 * Priority of a process goes from 0..MAX_PRIO-1, valid RT
470 * priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL/SCHED_BATCH
471 * tasks are in the range MAX_RT_PRIO..MAX_PRIO-1. Priority
472 * values are inverted: lower p->prio value means higher priority.
474 * The MAX_USER_RT_PRIO value allows the actual maximum
475 * RT priority to be separate from the value exported to
476 * user-space. This allows kernel threads to set their
477 * priority to a value higher than any user task. Note:
478 * MAX_RT_PRIO must not be smaller than MAX_USER_RT_PRIO.
481 #define MAX_USER_RT_PRIO 100
482 #define MAX_RT_PRIO MAX_USER_RT_PRIO
484 #define MAX_PRIO (MAX_RT_PRIO + 40)
486 #define rt_task(p) (unlikely((p)->prio < MAX_RT_PRIO))
487 #define batch_task(p) (unlikely((p)->policy == SCHED_BATCH))
490 * Some day this will be a full-fledged user tracking system..
493 atomic_t __count
; /* reference count */
494 atomic_t processes
; /* How many processes does this user have? */
495 atomic_t files
; /* How many open files does this user have? */
496 atomic_t sigpending
; /* How many pending signals does this user have? */
497 #ifdef CONFIG_INOTIFY
498 atomic_t inotify_watches
; /* How many inotify watches does this user have? */
499 atomic_t inotify_devs
; /* How many inotify devs does this user have opened? */
501 /* protected by mq_lock */
502 unsigned long mq_bytes
; /* How many bytes can be allocated to mqueue? */
503 unsigned long locked_shm
; /* How many pages of mlocked shm ? */
506 struct key
*uid_keyring
; /* UID specific keyring */
507 struct key
*session_keyring
; /* UID's default session keyring */
510 /* Hash table maintenance information */
511 struct list_head uidhash_list
;
515 extern struct user_struct
*find_user(uid_t
);
517 extern struct user_struct root_user
;
518 #define INIT_USER (&root_user)
520 typedef struct prio_array prio_array_t
;
521 struct backing_dev_info
;
522 struct reclaim_state
;
524 #ifdef CONFIG_SCHEDSTATS
526 /* cumulative counters */
527 unsigned long cpu_time
, /* time spent on the cpu */
528 run_delay
, /* time spent waiting on a runqueue */
529 pcnt
; /* # of timeslices run on this cpu */
532 unsigned long last_arrival
, /* when we last ran on a cpu */
533 last_queued
; /* when we were last queued to run */
536 extern struct file_operations proc_schedstat_operations
;
548 * sched-domains (multiprocessor balancing) declarations:
551 #define SCHED_LOAD_SCALE 128UL /* increase resolution of load */
553 #define SD_LOAD_BALANCE 1 /* Do load balancing on this domain. */
554 #define SD_BALANCE_NEWIDLE 2 /* Balance when about to become idle */
555 #define SD_BALANCE_EXEC 4 /* Balance on exec */
556 #define SD_BALANCE_FORK 8 /* Balance on fork, clone */
557 #define SD_WAKE_IDLE 16 /* Wake to idle CPU on task wakeup */
558 #define SD_WAKE_AFFINE 32 /* Wake task to waking CPU */
559 #define SD_WAKE_BALANCE 64 /* Perform balancing at task wakeup */
560 #define SD_SHARE_CPUPOWER 128 /* Domain members share cpu power */
563 struct sched_group
*next
; /* Must be a circular list */
567 * CPU power of this group, SCHED_LOAD_SCALE being max power for a
568 * single CPU. This is read only (except for setup, hotplug CPU).
570 unsigned long cpu_power
;
573 struct sched_domain
{
574 /* These fields must be setup */
575 struct sched_domain
*parent
; /* top domain must be null terminated */
576 struct sched_group
*groups
; /* the balancing groups of the domain */
577 cpumask_t span
; /* span of all CPUs in this domain */
578 unsigned long min_interval
; /* Minimum balance interval ms */
579 unsigned long max_interval
; /* Maximum balance interval ms */
580 unsigned int busy_factor
; /* less balancing by factor if busy */
581 unsigned int imbalance_pct
; /* No balance until over watermark */
582 unsigned long long cache_hot_time
; /* Task considered cache hot (ns) */
583 unsigned int cache_nice_tries
; /* Leave cache hot tasks for # tries */
584 unsigned int per_cpu_gain
; /* CPU % gained by adding domain cpus */
585 unsigned int busy_idx
;
586 unsigned int idle_idx
;
587 unsigned int newidle_idx
;
588 unsigned int wake_idx
;
589 unsigned int forkexec_idx
;
590 int flags
; /* See SD_* */
592 /* Runtime fields. */
593 unsigned long last_balance
; /* init to jiffies. units in jiffies */
594 unsigned int balance_interval
; /* initialise to 1. units in ms. */
595 unsigned int nr_balance_failed
; /* initialise to 0 */
597 #ifdef CONFIG_SCHEDSTATS
598 /* load_balance() stats */
599 unsigned long lb_cnt
[MAX_IDLE_TYPES
];
600 unsigned long lb_failed
[MAX_IDLE_TYPES
];
601 unsigned long lb_balanced
[MAX_IDLE_TYPES
];
602 unsigned long lb_imbalance
[MAX_IDLE_TYPES
];
603 unsigned long lb_gained
[MAX_IDLE_TYPES
];
604 unsigned long lb_hot_gained
[MAX_IDLE_TYPES
];
605 unsigned long lb_nobusyg
[MAX_IDLE_TYPES
];
606 unsigned long lb_nobusyq
[MAX_IDLE_TYPES
];
608 /* Active load balancing */
609 unsigned long alb_cnt
;
610 unsigned long alb_failed
;
611 unsigned long alb_pushed
;
613 /* SD_BALANCE_EXEC stats */
614 unsigned long sbe_cnt
;
615 unsigned long sbe_balanced
;
616 unsigned long sbe_pushed
;
618 /* SD_BALANCE_FORK stats */
619 unsigned long sbf_cnt
;
620 unsigned long sbf_balanced
;
621 unsigned long sbf_pushed
;
623 /* try_to_wake_up() stats */
624 unsigned long ttwu_wake_remote
;
625 unsigned long ttwu_move_affine
;
626 unsigned long ttwu_move_balance
;
630 extern void partition_sched_domains(cpumask_t
*partition1
,
631 cpumask_t
*partition2
);
634 * Maximum cache size the migration-costs auto-tuning code will
637 extern unsigned int max_cache_size
;
639 #endif /* CONFIG_SMP */
642 struct io_context
; /* See blkdev.h */
643 void exit_io_context(void);
646 #define NGROUPS_SMALL 32
647 #define NGROUPS_PER_BLOCK ((int)(PAGE_SIZE / sizeof(gid_t)))
651 gid_t small_block
[NGROUPS_SMALL
];
657 * get_group_info() must be called with the owning task locked (via task_lock())
658 * when task != current. The reason being that the vast majority of callers are
659 * looking at current->group_info, which can not be changed except by the
660 * current task. Changing current->group_info requires the task lock, too.
662 #define get_group_info(group_info) do { \
663 atomic_inc(&(group_info)->usage); \
666 #define put_group_info(group_info) do { \
667 if (atomic_dec_and_test(&(group_info)->usage)) \
668 groups_free(group_info); \
671 extern struct group_info
*groups_alloc(int gidsetsize
);
672 extern void groups_free(struct group_info
*group_info
);
673 extern int set_current_groups(struct group_info
*group_info
);
674 extern int groups_search(struct group_info
*group_info
, gid_t grp
);
675 /* access the groups "array" with this macro */
676 #define GROUP_AT(gi, i) \
677 ((gi)->blocks[(i)/NGROUPS_PER_BLOCK][(i)%NGROUPS_PER_BLOCK])
679 #ifdef ARCH_HAS_PREFETCH_SWITCH_STACK
680 extern void prefetch_stack(struct task_struct
*);
682 static inline void prefetch_stack(struct task_struct
*t
) { }
685 struct audit_context
; /* See audit.c */
687 struct pipe_inode_info
;
691 SLEEP_NONINTERACTIVE
,
697 volatile long state
; /* -1 unrunnable, 0 runnable, >0 stopped */
698 struct thread_info
*thread_info
;
700 unsigned long flags
; /* per process flags, defined below */
701 unsigned long ptrace
;
703 int lock_depth
; /* BKL lock depth */
705 #if defined(CONFIG_SMP) && defined(__ARCH_WANT_UNLOCKED_CTXSW)
708 int prio
, static_prio
;
709 struct list_head run_list
;
712 unsigned short ioprio
;
713 unsigned int btrace_seq
;
715 unsigned long sleep_avg
;
716 unsigned long long timestamp
, last_ran
;
717 unsigned long long sched_time
; /* sched_clock time spent running */
718 enum sleep_type sleep_type
;
720 unsigned long policy
;
721 cpumask_t cpus_allowed
;
722 unsigned int time_slice
, first_time_slice
;
724 #ifdef CONFIG_SCHEDSTATS
725 struct sched_info sched_info
;
728 struct list_head tasks
;
730 * ptrace_list/ptrace_children forms the list of my children
731 * that were stolen by a ptracer.
733 struct list_head ptrace_children
;
734 struct list_head ptrace_list
;
736 struct mm_struct
*mm
, *active_mm
;
739 struct linux_binfmt
*binfmt
;
741 int exit_code
, exit_signal
;
742 int pdeath_signal
; /* The signal sent when the parent dies */
744 unsigned long personality
;
749 * pointers to (original) parent process, youngest child, younger sibling,
750 * older sibling, respectively. (p->father can be replaced with
753 struct task_struct
*real_parent
; /* real parent process (when being debugged) */
754 struct task_struct
*parent
; /* parent process */
756 * children/sibling forms the list of my children plus the
757 * tasks I'm ptracing.
759 struct list_head children
; /* list of my children */
760 struct list_head sibling
; /* linkage in my parent's children list */
761 struct task_struct
*group_leader
; /* threadgroup leader */
763 /* PID/PID hash table linkage. */
764 struct pid_link pids
[PIDTYPE_MAX
];
765 struct list_head thread_group
;
767 struct completion
*vfork_done
; /* for vfork() */
768 int __user
*set_child_tid
; /* CLONE_CHILD_SETTID */
769 int __user
*clear_child_tid
; /* CLONE_CHILD_CLEARTID */
771 unsigned long rt_priority
;
772 cputime_t utime
, stime
;
773 unsigned long nvcsw
, nivcsw
; /* context switch counts */
774 struct timespec start_time
;
775 /* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */
776 unsigned long min_flt
, maj_flt
;
778 cputime_t it_prof_expires
, it_virt_expires
;
779 unsigned long long it_sched_expires
;
780 struct list_head cpu_timers
[3];
782 /* process credentials */
783 uid_t uid
,euid
,suid
,fsuid
;
784 gid_t gid
,egid
,sgid
,fsgid
;
785 struct group_info
*group_info
;
786 kernel_cap_t cap_effective
, cap_inheritable
, cap_permitted
;
787 unsigned keep_capabilities
:1;
788 struct user_struct
*user
;
790 struct key
*request_key_auth
; /* assumed request_key authority */
791 struct key
*thread_keyring
; /* keyring private to this thread */
792 unsigned char jit_keyring
; /* default keyring to attach requested keys to */
794 int oomkilladj
; /* OOM kill score adjustment (bit shift). */
795 char comm
[TASK_COMM_LEN
]; /* executable name excluding path
796 - access with [gs]et_task_comm (which lock
798 - initialized normally by flush_old_exec */
799 /* file system info */
800 int link_count
, total_link_count
;
802 struct sysv_sem sysvsem
;
803 /* CPU-specific state of this task */
804 struct thread_struct thread
;
805 /* filesystem information */
806 struct fs_struct
*fs
;
807 /* open file information */
808 struct files_struct
*files
;
810 struct namespace *namespace;
811 /* signal handlers */
812 struct signal_struct
*signal
;
813 struct sighand_struct
*sighand
;
815 sigset_t blocked
, real_blocked
;
816 sigset_t saved_sigmask
; /* To be restored with TIF_RESTORE_SIGMASK */
817 struct sigpending pending
;
819 unsigned long sas_ss_sp
;
821 int (*notifier
)(void *priv
);
823 sigset_t
*notifier_mask
;
826 struct audit_context
*audit_context
;
829 /* Thread group tracking */
832 /* Protection of (de-)allocation: mm, files, fs, tty, keyrings */
833 spinlock_t alloc_lock
;
834 /* Protection of proc_dentry: nesting proc_lock, dcache_lock, write_lock_irq(&tasklist_lock); */
835 spinlock_t proc_lock
;
837 #ifdef CONFIG_DEBUG_MUTEXES
838 /* mutex deadlock detection */
839 struct mutex_waiter
*blocked_on
;
842 /* journalling filesystem info */
846 struct reclaim_state
*reclaim_state
;
848 struct dentry
*proc_dentry
;
849 struct backing_dev_info
*backing_dev_info
;
851 struct io_context
*io_context
;
853 unsigned long ptrace_message
;
854 siginfo_t
*last_siginfo
; /* For ptrace use. */
856 * current io wait handle: wait queue entry to use for io waits
857 * If this thread is processing aio, this points at the waitqueue
858 * inside the currently handled kiocb. It may be NULL (i.e. default
859 * to a stack based synchronous wait) if its doing sync IO.
861 wait_queue_t
*io_wait
;
862 /* i/o counters(bytes read/written, #syscalls */
863 u64 rchar
, wchar
, syscr
, syscw
;
864 #if defined(CONFIG_BSD_PROCESS_ACCT)
865 u64 acct_rss_mem1
; /* accumulated rss usage */
866 u64 acct_vm_mem1
; /* accumulated virtual memory usage */
867 clock_t acct_stimexpd
; /* clock_t-converted stime since last update */
870 struct mempolicy
*mempolicy
;
873 #ifdef CONFIG_CPUSETS
874 struct cpuset
*cpuset
;
875 nodemask_t mems_allowed
;
876 int cpuset_mems_generation
;
877 int cpuset_mem_spread_rotor
;
879 struct robust_list_head __user
*robust_list
;
881 struct compat_robust_list_head __user
*compat_robust_list
;
884 atomic_t fs_excl
; /* holding fs exclusive resources */
888 * cache last used pipe for splice
890 struct pipe_inode_info
*splice_pipe
;
893 static inline pid_t
process_group(struct task_struct
*tsk
)
895 return tsk
->signal
->pgrp
;
899 * pid_alive - check that a task structure is not stale
900 * @p: Task structure to be checked.
902 * Test if a process is not yet dead (at most zombie state)
903 * If pid_alive fails, then pointers within the task structure
904 * can be stale and must not be dereferenced.
906 static inline int pid_alive(struct task_struct
*p
)
908 return p
->pids
[PIDTYPE_PID
].pid
!= NULL
;
911 extern void free_task(struct task_struct
*tsk
);
912 #define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0)
914 extern void __put_task_struct(struct task_struct
*t
);
916 static inline void put_task_struct(struct task_struct
*t
)
918 if (atomic_dec_and_test(&t
->usage
))
919 __put_task_struct(t
);
925 #define PF_ALIGNWARN 0x00000001 /* Print alignment warning msgs */
926 /* Not implemented yet, only for 486*/
927 #define PF_STARTING 0x00000002 /* being created */
928 #define PF_EXITING 0x00000004 /* getting shut down */
929 #define PF_DEAD 0x00000008 /* Dead */
930 #define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */
931 #define PF_SUPERPRIV 0x00000100 /* used super-user privileges */
932 #define PF_DUMPCORE 0x00000200 /* dumped core */
933 #define PF_SIGNALED 0x00000400 /* killed by a signal */
934 #define PF_MEMALLOC 0x00000800 /* Allocating memory */
935 #define PF_FLUSHER 0x00001000 /* responsible for disk writeback */
936 #define PF_USED_MATH 0x00002000 /* if unset the fpu must be initialized before use */
937 #define PF_FREEZE 0x00004000 /* this task is being frozen for suspend now */
938 #define PF_NOFREEZE 0x00008000 /* this thread should not be frozen */
939 #define PF_FROZEN 0x00010000 /* frozen for system suspend */
940 #define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */
941 #define PF_KSWAPD 0x00040000 /* I am kswapd */
942 #define PF_SWAPOFF 0x00080000 /* I am in swapoff */
943 #define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */
944 #define PF_SYNCWRITE 0x00200000 /* I am doing a sync write */
945 #define PF_BORROWED_MM 0x00400000 /* I am a kthread doing use_mm */
946 #define PF_RANDOMIZE 0x00800000 /* randomize virtual address space */
947 #define PF_SWAPWRITE 0x01000000 /* Allowed to write to swap */
948 #define PF_SPREAD_PAGE 0x04000000 /* Spread page cache over cpuset */
949 #define PF_SPREAD_SLAB 0x08000000 /* Spread some slab caches over cpuset */
950 #define PF_MEMPOLICY 0x10000000 /* Non-default NUMA mempolicy */
953 * Only the _current_ task can read/write to tsk->flags, but other
954 * tasks can access tsk->flags in readonly mode for example
955 * with tsk_used_math (like during threaded core dumping).
956 * There is however an exception to this rule during ptrace
957 * or during fork: the ptracer task is allowed to write to the
958 * child->flags of its traced child (same goes for fork, the parent
959 * can write to the child->flags), because we're guaranteed the
960 * child is not running and in turn not changing child->flags
961 * at the same time the parent does it.
963 #define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0)
964 #define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0)
965 #define clear_used_math() clear_stopped_child_used_math(current)
966 #define set_used_math() set_stopped_child_used_math(current)
967 #define conditional_stopped_child_used_math(condition, child) \
968 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0)
969 #define conditional_used_math(condition) \
970 conditional_stopped_child_used_math(condition, current)
971 #define copy_to_stopped_child_used_math(child) \
972 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0)
973 /* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */
974 #define tsk_used_math(p) ((p)->flags & PF_USED_MATH)
975 #define used_math() tsk_used_math(current)
978 extern int set_cpus_allowed(task_t
*p
, cpumask_t new_mask
);
980 static inline int set_cpus_allowed(task_t
*p
, cpumask_t new_mask
)
982 if (!cpu_isset(0, new_mask
))
988 extern unsigned long long sched_clock(void);
989 extern unsigned long long current_sched_time(const task_t
*current_task
);
991 /* sched_exec is called by processes performing an exec */
993 extern void sched_exec(void);
995 #define sched_exec() {}
998 #ifdef CONFIG_HOTPLUG_CPU
999 extern void idle_task_exit(void);
1001 static inline void idle_task_exit(void) {}
1004 extern void sched_idle_next(void);
1005 extern void set_user_nice(task_t
*p
, long nice
);
1006 extern int task_prio(const task_t
*p
);
1007 extern int task_nice(const task_t
*p
);
1008 extern int can_nice(const task_t
*p
, const int nice
);
1009 extern int task_curr(const task_t
*p
);
1010 extern int idle_cpu(int cpu
);
1011 extern int sched_setscheduler(struct task_struct
*, int, struct sched_param
*);
1012 extern task_t
*idle_task(int cpu
);
1013 extern task_t
*curr_task(int cpu
);
1014 extern void set_curr_task(int cpu
, task_t
*p
);
1019 * The default (Linux) execution domain.
1021 extern struct exec_domain default_exec_domain
;
1023 union thread_union
{
1024 struct thread_info thread_info
;
1025 unsigned long stack
[THREAD_SIZE
/sizeof(long)];
1028 #ifndef __HAVE_ARCH_KSTACK_END
1029 static inline int kstack_end(void *addr
)
1031 /* Reliable end of stack detection:
1032 * Some APM bios versions misalign the stack
1034 return !(((unsigned long)addr
+sizeof(void*)-1) & (THREAD_SIZE
-sizeof(void*)));
1038 extern union thread_union init_thread_union
;
1039 extern struct task_struct init_task
;
1041 extern struct mm_struct init_mm
;
1043 #define find_task_by_pid(nr) find_task_by_pid_type(PIDTYPE_PID, nr)
1044 extern struct task_struct
*find_task_by_pid_type(int type
, int pid
);
1045 extern void set_special_pids(pid_t session
, pid_t pgrp
);
1046 extern void __set_special_pids(pid_t session
, pid_t pgrp
);
1048 /* per-UID process charging. */
1049 extern struct user_struct
* alloc_uid(uid_t
);
1050 static inline struct user_struct
*get_uid(struct user_struct
*u
)
1052 atomic_inc(&u
->__count
);
1055 extern void free_uid(struct user_struct
*);
1056 extern void switch_uid(struct user_struct
*);
1058 #include <asm/current.h>
1060 extern void do_timer(struct pt_regs
*);
1062 extern int FASTCALL(wake_up_state(struct task_struct
* tsk
, unsigned int state
));
1063 extern int FASTCALL(wake_up_process(struct task_struct
* tsk
));
1064 extern void FASTCALL(wake_up_new_task(struct task_struct
* tsk
,
1065 unsigned long clone_flags
));
1067 extern void kick_process(struct task_struct
*tsk
);
1069 static inline void kick_process(struct task_struct
*tsk
) { }
1071 extern void FASTCALL(sched_fork(task_t
* p
, int clone_flags
));
1072 extern void FASTCALL(sched_exit(task_t
* p
));
1074 extern int in_group_p(gid_t
);
1075 extern int in_egroup_p(gid_t
);
1077 extern void proc_caches_init(void);
1078 extern void flush_signals(struct task_struct
*);
1079 extern void flush_signal_handlers(struct task_struct
*, int force_default
);
1080 extern int dequeue_signal(struct task_struct
*tsk
, sigset_t
*mask
, siginfo_t
*info
);
1082 static inline int dequeue_signal_lock(struct task_struct
*tsk
, sigset_t
*mask
, siginfo_t
*info
)
1084 unsigned long flags
;
1087 spin_lock_irqsave(&tsk
->sighand
->siglock
, flags
);
1088 ret
= dequeue_signal(tsk
, mask
, info
);
1089 spin_unlock_irqrestore(&tsk
->sighand
->siglock
, flags
);
1094 extern void block_all_signals(int (*notifier
)(void *priv
), void *priv
,
1096 extern void unblock_all_signals(void);
1097 extern void release_task(struct task_struct
* p
);
1098 extern int send_sig_info(int, struct siginfo
*, struct task_struct
*);
1099 extern int send_group_sig_info(int, struct siginfo
*, struct task_struct
*);
1100 extern int force_sigsegv(int, struct task_struct
*);
1101 extern int force_sig_info(int, struct siginfo
*, struct task_struct
*);
1102 extern int __kill_pg_info(int sig
, struct siginfo
*info
, pid_t pgrp
);
1103 extern int kill_pg_info(int, struct siginfo
*, pid_t
);
1104 extern int kill_proc_info(int, struct siginfo
*, pid_t
);
1105 extern int kill_proc_info_as_uid(int, struct siginfo
*, pid_t
, uid_t
, uid_t
);
1106 extern void do_notify_parent(struct task_struct
*, int);
1107 extern void force_sig(int, struct task_struct
*);
1108 extern void force_sig_specific(int, struct task_struct
*);
1109 extern int send_sig(int, struct task_struct
*, int);
1110 extern void zap_other_threads(struct task_struct
*p
);
1111 extern int kill_pg(pid_t
, int, int);
1112 extern int kill_proc(pid_t
, int, int);
1113 extern struct sigqueue
*sigqueue_alloc(void);
1114 extern void sigqueue_free(struct sigqueue
*);
1115 extern int send_sigqueue(int, struct sigqueue
*, struct task_struct
*);
1116 extern int send_group_sigqueue(int, struct sigqueue
*, struct task_struct
*);
1117 extern int do_sigaction(int, struct k_sigaction
*, struct k_sigaction
*);
1118 extern int do_sigaltstack(const stack_t __user
*, stack_t __user
*, unsigned long);
1120 /* These can be the second arg to send_sig_info/send_group_sig_info. */
1121 #define SEND_SIG_NOINFO ((struct siginfo *) 0)
1122 #define SEND_SIG_PRIV ((struct siginfo *) 1)
1123 #define SEND_SIG_FORCED ((struct siginfo *) 2)
1125 static inline int is_si_special(const struct siginfo
*info
)
1127 return info
<= SEND_SIG_FORCED
;
1130 /* True if we are on the alternate signal stack. */
1132 static inline int on_sig_stack(unsigned long sp
)
1134 return (sp
- current
->sas_ss_sp
< current
->sas_ss_size
);
1137 static inline int sas_ss_flags(unsigned long sp
)
1139 return (current
->sas_ss_size
== 0 ? SS_DISABLE
1140 : on_sig_stack(sp
) ? SS_ONSTACK
: 0);
1144 * Routines for handling mm_structs
1146 extern struct mm_struct
* mm_alloc(void);
1148 /* mmdrop drops the mm and the page tables */
1149 extern void FASTCALL(__mmdrop(struct mm_struct
*));
1150 static inline void mmdrop(struct mm_struct
* mm
)
1152 if (atomic_dec_and_test(&mm
->mm_count
))
1156 /* mmput gets rid of the mappings and all user-space */
1157 extern void mmput(struct mm_struct
*);
1158 /* Grab a reference to a task's mm, if it is not already going away */
1159 extern struct mm_struct
*get_task_mm(struct task_struct
*task
);
1160 /* Remove the current tasks stale references to the old mm_struct */
1161 extern void mm_release(struct task_struct
*, struct mm_struct
*);
1163 extern int copy_thread(int, unsigned long, unsigned long, unsigned long, struct task_struct
*, struct pt_regs
*);
1164 extern void flush_thread(void);
1165 extern void exit_thread(void);
1167 extern void exit_files(struct task_struct
*);
1168 extern void __cleanup_signal(struct signal_struct
*);
1169 extern void __cleanup_sighand(struct sighand_struct
*);
1170 extern void exit_itimers(struct signal_struct
*);
1172 extern NORET_TYPE
void do_group_exit(int);
1174 extern void daemonize(const char *, ...);
1175 extern int allow_signal(int);
1176 extern int disallow_signal(int);
1177 extern task_t
*child_reaper
;
1179 extern int do_execve(char *, char __user
* __user
*, char __user
* __user
*, struct pt_regs
*);
1180 extern long do_fork(unsigned long, unsigned long, struct pt_regs
*, unsigned long, int __user
*, int __user
*);
1181 task_t
*fork_idle(int);
1183 extern void set_task_comm(struct task_struct
*tsk
, char *from
);
1184 extern void get_task_comm(char *to
, struct task_struct
*tsk
);
1187 extern void wait_task_inactive(task_t
* p
);
1189 #define wait_task_inactive(p) do { } while (0)
1192 #define remove_parent(p) list_del_init(&(p)->sibling)
1193 #define add_parent(p) list_add_tail(&(p)->sibling,&(p)->parent->children)
1195 #define next_task(p) list_entry(rcu_dereference((p)->tasks.next), struct task_struct, tasks)
1197 #define for_each_process(p) \
1198 for (p = &init_task ; (p = next_task(p)) != &init_task ; )
1201 * Careful: do_each_thread/while_each_thread is a double loop so
1202 * 'break' will not work as expected - use goto instead.
1204 #define do_each_thread(g, t) \
1205 for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do
1207 #define while_each_thread(g, t) \
1208 while ((t = next_thread(t)) != g)
1210 /* de_thread depends on thread_group_leader not being a pid based check */
1211 #define thread_group_leader(p) (p == p->group_leader)
1213 static inline task_t
*next_thread(const task_t
*p
)
1215 return list_entry(rcu_dereference(p
->thread_group
.next
),
1216 task_t
, thread_group
);
1219 static inline int thread_group_empty(task_t
*p
)
1221 return list_empty(&p
->thread_group
);
1224 #define delay_group_leader(p) \
1225 (thread_group_leader(p) && !thread_group_empty(p))
1228 * Protects ->fs, ->files, ->mm, ->ptrace, ->group_info, ->comm, keyring
1229 * subscriptions and synchronises with wait4(). Also used in procfs. Also
1230 * pins the final release of task.io_context. Also protects ->cpuset.
1232 * Nests both inside and outside of read_lock(&tasklist_lock).
1233 * It must not be nested with write_lock_irq(&tasklist_lock),
1234 * neither inside nor outside.
1236 static inline void task_lock(struct task_struct
*p
)
1238 spin_lock(&p
->alloc_lock
);
1241 static inline void task_unlock(struct task_struct
*p
)
1243 spin_unlock(&p
->alloc_lock
);
1246 extern struct sighand_struct
*lock_task_sighand(struct task_struct
*tsk
,
1247 unsigned long *flags
);
1249 static inline void unlock_task_sighand(struct task_struct
*tsk
,
1250 unsigned long *flags
)
1252 spin_unlock_irqrestore(&tsk
->sighand
->siglock
, *flags
);
1255 #ifndef __HAVE_THREAD_FUNCTIONS
1257 #define task_thread_info(task) (task)->thread_info
1258 #define task_stack_page(task) ((void*)((task)->thread_info))
1260 static inline void setup_thread_stack(struct task_struct
*p
, struct task_struct
*org
)
1262 *task_thread_info(p
) = *task_thread_info(org
);
1263 task_thread_info(p
)->task
= p
;
1266 static inline unsigned long *end_of_stack(struct task_struct
*p
)
1268 return (unsigned long *)(p
->thread_info
+ 1);
1273 /* set thread flags in other task's structures
1274 * - see asm/thread_info.h for TIF_xxxx flags available
1276 static inline void set_tsk_thread_flag(struct task_struct
*tsk
, int flag
)
1278 set_ti_thread_flag(task_thread_info(tsk
), flag
);
1281 static inline void clear_tsk_thread_flag(struct task_struct
*tsk
, int flag
)
1283 clear_ti_thread_flag(task_thread_info(tsk
), flag
);
1286 static inline int test_and_set_tsk_thread_flag(struct task_struct
*tsk
, int flag
)
1288 return test_and_set_ti_thread_flag(task_thread_info(tsk
), flag
);
1291 static inline int test_and_clear_tsk_thread_flag(struct task_struct
*tsk
, int flag
)
1293 return test_and_clear_ti_thread_flag(task_thread_info(tsk
), flag
);
1296 static inline int test_tsk_thread_flag(struct task_struct
*tsk
, int flag
)
1298 return test_ti_thread_flag(task_thread_info(tsk
), flag
);
1301 static inline void set_tsk_need_resched(struct task_struct
*tsk
)
1303 set_tsk_thread_flag(tsk
,TIF_NEED_RESCHED
);
1306 static inline void clear_tsk_need_resched(struct task_struct
*tsk
)
1308 clear_tsk_thread_flag(tsk
,TIF_NEED_RESCHED
);
1311 static inline int signal_pending(struct task_struct
*p
)
1313 return unlikely(test_tsk_thread_flag(p
,TIF_SIGPENDING
));
1316 static inline int need_resched(void)
1318 return unlikely(test_thread_flag(TIF_NEED_RESCHED
));
1322 * cond_resched() and cond_resched_lock(): latency reduction via
1323 * explicit rescheduling in places that are safe. The return
1324 * value indicates whether a reschedule was done in fact.
1325 * cond_resched_lock() will drop the spinlock before scheduling,
1326 * cond_resched_softirq() will enable bhs before scheduling.
1328 extern int cond_resched(void);
1329 extern int cond_resched_lock(spinlock_t
* lock
);
1330 extern int cond_resched_softirq(void);
1333 * Does a critical section need to be broken due to another
1336 #if defined(CONFIG_PREEMPT) && defined(CONFIG_SMP)
1337 # define need_lockbreak(lock) ((lock)->break_lock)
1339 # define need_lockbreak(lock) 0
1343 * Does a critical section need to be broken due to another
1344 * task waiting or preemption being signalled:
1346 static inline int lock_need_resched(spinlock_t
*lock
)
1348 if (need_lockbreak(lock
) || need_resched())
1353 /* Reevaluate whether the task has signals pending delivery.
1354 This is required every time the blocked sigset_t changes.
1355 callers must hold sighand->siglock. */
1357 extern FASTCALL(void recalc_sigpending_tsk(struct task_struct
*t
));
1358 extern void recalc_sigpending(void);
1360 extern void signal_wake_up(struct task_struct
*t
, int resume_stopped
);
1363 * Wrappers for p->thread_info->cpu access. No-op on UP.
1367 static inline unsigned int task_cpu(const struct task_struct
*p
)
1369 return task_thread_info(p
)->cpu
;
1372 static inline void set_task_cpu(struct task_struct
*p
, unsigned int cpu
)
1374 task_thread_info(p
)->cpu
= cpu
;
1379 static inline unsigned int task_cpu(const struct task_struct
*p
)
1384 static inline void set_task_cpu(struct task_struct
*p
, unsigned int cpu
)
1388 #endif /* CONFIG_SMP */
1390 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1391 extern void arch_pick_mmap_layout(struct mm_struct
*mm
);
1393 static inline void arch_pick_mmap_layout(struct mm_struct
*mm
)
1395 mm
->mmap_base
= TASK_UNMAPPED_BASE
;
1396 mm
->get_unmapped_area
= arch_get_unmapped_area
;
1397 mm
->unmap_area
= arch_unmap_area
;
1401 extern long sched_setaffinity(pid_t pid
, cpumask_t new_mask
);
1402 extern long sched_getaffinity(pid_t pid
, cpumask_t
*mask
);
1404 extern void normalize_rt_tasks(void);
1408 * Check if a process has been frozen
1410 static inline int frozen(struct task_struct
*p
)
1412 return p
->flags
& PF_FROZEN
;
1416 * Check if there is a request to freeze a process
1418 static inline int freezing(struct task_struct
*p
)
1420 return p
->flags
& PF_FREEZE
;
1424 * Request that a process be frozen
1425 * FIXME: SMP problem. We may not modify other process' flags!
1427 static inline void freeze(struct task_struct
*p
)
1429 p
->flags
|= PF_FREEZE
;
1433 * Wake up a frozen process
1435 static inline int thaw_process(struct task_struct
*p
)
1438 p
->flags
&= ~PF_FROZEN
;
1446 * freezing is complete, mark process as frozen
1448 static inline void frozen_process(struct task_struct
*p
)
1450 p
->flags
= (p
->flags
& ~PF_FREEZE
) | PF_FROZEN
;
1453 extern void refrigerator(void);
1454 extern int freeze_processes(void);
1455 extern void thaw_processes(void);
1457 static inline int try_to_freeze(void)
1459 if (freezing(current
)) {
1466 static inline int frozen(struct task_struct
*p
) { return 0; }
1467 static inline int freezing(struct task_struct
*p
) { return 0; }
1468 static inline void freeze(struct task_struct
*p
) { BUG(); }
1469 static inline int thaw_process(struct task_struct
*p
) { return 1; }
1470 static inline void frozen_process(struct task_struct
*p
) { BUG(); }
1472 static inline void refrigerator(void) {}
1473 static inline int freeze_processes(void) { BUG(); return 0; }
1474 static inline void thaw_processes(void) {}
1476 static inline int try_to_freeze(void) { return 0; }
1478 #endif /* CONFIG_PM */
1479 #endif /* __KERNEL__ */