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>
39 #include <linux/auxvec.h> /* For AT_VECTOR_SIZE */
46 #define CSIGNAL 0x000000ff /* signal mask to be sent at exit */
47 #define CLONE_VM 0x00000100 /* set if VM shared between processes */
48 #define CLONE_FS 0x00000200 /* set if fs info shared between processes */
49 #define CLONE_FILES 0x00000400 /* set if open files shared between processes */
50 #define CLONE_SIGHAND 0x00000800 /* set if signal handlers and blocked signals shared */
51 #define CLONE_PTRACE 0x00002000 /* set if we want to let tracing continue on the child too */
52 #define CLONE_VFORK 0x00004000 /* set if the parent wants the child to wake it up on mm_release */
53 #define CLONE_PARENT 0x00008000 /* set if we want to have the same parent as the cloner */
54 #define CLONE_THREAD 0x00010000 /* Same thread group? */
55 #define CLONE_NEWNS 0x00020000 /* New namespace group? */
56 #define CLONE_SYSVSEM 0x00040000 /* share system V SEM_UNDO semantics */
57 #define CLONE_SETTLS 0x00080000 /* create a new TLS for the child */
58 #define CLONE_PARENT_SETTID 0x00100000 /* set the TID in the parent */
59 #define CLONE_CHILD_CLEARTID 0x00200000 /* clear the TID in the child */
60 #define CLONE_DETACHED 0x00400000 /* Unused, ignored */
61 #define CLONE_UNTRACED 0x00800000 /* set if the tracing process can't force CLONE_PTRACE on this clone */
62 #define CLONE_CHILD_SETTID 0x01000000 /* set the TID in the child */
63 #define CLONE_STOPPED 0x02000000 /* Start in stopped state */
66 * List of flags we want to share for kernel threads,
67 * if only because they are not used by them anyway.
69 #define CLONE_KERNEL (CLONE_FS | CLONE_FILES | CLONE_SIGHAND)
72 * These are the constant used to fake the fixed-point load-average
73 * counting. Some notes:
74 * - 11 bit fractions expand to 22 bits by the multiplies: this gives
75 * a load-average precision of 10 bits integer + 11 bits fractional
76 * - if you want to count load-averages more often, you need more
77 * precision, or rounding will get you. With 2-second counting freq,
78 * the EXP_n values would be 1981, 2034 and 2043 if still using only
81 extern unsigned long avenrun
[]; /* Load averages */
83 #define FSHIFT 11 /* nr of bits of precision */
84 #define FIXED_1 (1<<FSHIFT) /* 1.0 as fixed-point */
85 #define LOAD_FREQ (5*HZ) /* 5 sec intervals */
86 #define EXP_1 1884 /* 1/exp(5sec/1min) as fixed-point */
87 #define EXP_5 2014 /* 1/exp(5sec/5min) */
88 #define EXP_15 2037 /* 1/exp(5sec/15min) */
90 #define CALC_LOAD(load,exp,n) \
92 load += n*(FIXED_1-exp); \
95 extern unsigned long total_forks
;
96 extern int nr_threads
;
98 DECLARE_PER_CPU(unsigned long, process_counts
);
99 extern int nr_processes(void);
100 extern unsigned long nr_running(void);
101 extern unsigned long nr_uninterruptible(void);
102 extern unsigned long nr_iowait(void);
104 #include <linux/time.h>
105 #include <linux/param.h>
106 #include <linux/resource.h>
107 #include <linux/timer.h>
108 #include <linux/hrtimer.h>
110 #include <asm/processor.h>
113 * Task state bitmask. NOTE! These bits are also
114 * encoded in fs/proc/array.c: get_task_state().
116 * We have two separate sets of flags: task->state
117 * is about runnability, while task->exit_state are
118 * about the task exiting. Confusing, but this way
119 * modifying one set can't modify the other one by
122 #define TASK_RUNNING 0
123 #define TASK_INTERRUPTIBLE 1
124 #define TASK_UNINTERRUPTIBLE 2
125 #define TASK_STOPPED 4
126 #define TASK_TRACED 8
127 /* in tsk->exit_state */
128 #define EXIT_ZOMBIE 16
130 /* in tsk->state again */
131 #define TASK_NONINTERACTIVE 64
133 #define __set_task_state(tsk, state_value) \
134 do { (tsk)->state = (state_value); } while (0)
135 #define set_task_state(tsk, state_value) \
136 set_mb((tsk)->state, (state_value))
139 * set_current_state() includes a barrier so that the write of current->state
140 * is correctly serialised wrt the caller's subsequent test of whether to
143 * set_current_state(TASK_UNINTERRUPTIBLE);
144 * if (do_i_need_to_sleep())
147 * If the caller does not need such serialisation then use __set_current_state()
149 #define __set_current_state(state_value) \
150 do { current->state = (state_value); } while (0)
151 #define set_current_state(state_value) \
152 set_mb(current->state, (state_value))
154 /* Task command name length */
155 #define TASK_COMM_LEN 16
158 * Scheduling policies
160 #define SCHED_NORMAL 0
163 #define SCHED_BATCH 3
171 #include <linux/spinlock.h>
174 * This serializes "schedule()" and also protects
175 * the run-queue from deletions/modifications (but
176 * _adding_ to the beginning of the run-queue has
179 extern rwlock_t tasklist_lock
;
180 extern spinlock_t mmlist_lock
;
182 typedef struct task_struct task_t
;
184 extern void sched_init(void);
185 extern void sched_init_smp(void);
186 extern void init_idle(task_t
*idle
, int cpu
);
188 extern cpumask_t nohz_cpu_mask
;
190 extern void show_state(void);
191 extern void show_regs(struct pt_regs
*);
194 * TASK is a pointer to the task whose backtrace we want to see (or NULL for current
195 * task), SP is the stack pointer of the first frame that should be shown in the back
196 * trace (or NULL if the entire call-chain of the task should be shown).
198 extern void show_stack(struct task_struct
*task
, unsigned long *sp
);
200 void io_schedule(void);
201 long io_schedule_timeout(long timeout
);
203 extern void cpu_init (void);
204 extern void trap_init(void);
205 extern void update_process_times(int user
);
206 extern void scheduler_tick(void);
208 #ifdef CONFIG_DETECT_SOFTLOCKUP
209 extern void softlockup_tick(void);
210 extern void spawn_softlockup_task(void);
211 extern void touch_softlockup_watchdog(void);
213 static inline void softlockup_tick(void)
216 static inline void spawn_softlockup_task(void)
219 static inline void touch_softlockup_watchdog(void)
225 /* Attach to any functions which should be ignored in wchan output. */
226 #define __sched __attribute__((__section__(".sched.text")))
227 /* Is this address in the __sched functions? */
228 extern int in_sched_functions(unsigned long addr
);
230 #define MAX_SCHEDULE_TIMEOUT LONG_MAX
231 extern signed long FASTCALL(schedule_timeout(signed long timeout
));
232 extern signed long schedule_timeout_interruptible(signed long timeout
);
233 extern signed long schedule_timeout_uninterruptible(signed long timeout
);
234 asmlinkage
void schedule(void);
238 /* Maximum number of active map areas.. This is a random (large) number */
239 #define DEFAULT_MAX_MAP_COUNT 65536
241 extern int sysctl_max_map_count
;
243 #include <linux/aio.h>
246 arch_get_unmapped_area(struct file
*, unsigned long, unsigned long,
247 unsigned long, unsigned long);
249 arch_get_unmapped_area_topdown(struct file
*filp
, unsigned long addr
,
250 unsigned long len
, unsigned long pgoff
,
251 unsigned long flags
);
252 extern void arch_unmap_area(struct mm_struct
*, unsigned long);
253 extern void arch_unmap_area_topdown(struct mm_struct
*, unsigned long);
255 #if NR_CPUS >= CONFIG_SPLIT_PTLOCK_CPUS
257 * The mm counters are not protected by its page_table_lock,
258 * so must be incremented atomically.
260 #define set_mm_counter(mm, member, value) atomic_long_set(&(mm)->_##member, value)
261 #define get_mm_counter(mm, member) ((unsigned long)atomic_long_read(&(mm)->_##member))
262 #define add_mm_counter(mm, member, value) atomic_long_add(value, &(mm)->_##member)
263 #define inc_mm_counter(mm, member) atomic_long_inc(&(mm)->_##member)
264 #define dec_mm_counter(mm, member) atomic_long_dec(&(mm)->_##member)
265 typedef atomic_long_t mm_counter_t
;
267 #else /* NR_CPUS < CONFIG_SPLIT_PTLOCK_CPUS */
269 * The mm counters are protected by its page_table_lock,
270 * so can be incremented directly.
272 #define set_mm_counter(mm, member, value) (mm)->_##member = (value)
273 #define get_mm_counter(mm, member) ((mm)->_##member)
274 #define add_mm_counter(mm, member, value) (mm)->_##member += (value)
275 #define inc_mm_counter(mm, member) (mm)->_##member++
276 #define dec_mm_counter(mm, member) (mm)->_##member--
277 typedef unsigned long mm_counter_t
;
279 #endif /* NR_CPUS < CONFIG_SPLIT_PTLOCK_CPUS */
281 #define get_mm_rss(mm) \
282 (get_mm_counter(mm, file_rss) + get_mm_counter(mm, anon_rss))
283 #define update_hiwater_rss(mm) do { \
284 unsigned long _rss = get_mm_rss(mm); \
285 if ((mm)->hiwater_rss < _rss) \
286 (mm)->hiwater_rss = _rss; \
288 #define update_hiwater_vm(mm) do { \
289 if ((mm)->hiwater_vm < (mm)->total_vm) \
290 (mm)->hiwater_vm = (mm)->total_vm; \
294 struct vm_area_struct
* mmap
; /* list of VMAs */
295 struct rb_root mm_rb
;
296 struct vm_area_struct
* mmap_cache
; /* last find_vma result */
297 unsigned long (*get_unmapped_area
) (struct file
*filp
,
298 unsigned long addr
, unsigned long len
,
299 unsigned long pgoff
, unsigned long flags
);
300 void (*unmap_area
) (struct mm_struct
*mm
, unsigned long addr
);
301 unsigned long mmap_base
; /* base of mmap area */
302 unsigned long task_size
; /* size of task vm space */
303 unsigned long cached_hole_size
; /* if non-zero, the largest hole below free_area_cache */
304 unsigned long free_area_cache
; /* first hole of size cached_hole_size or larger */
306 atomic_t mm_users
; /* How many users with user space? */
307 atomic_t mm_count
; /* How many references to "struct mm_struct" (users count as 1) */
308 int map_count
; /* number of VMAs */
309 struct rw_semaphore mmap_sem
;
310 spinlock_t page_table_lock
; /* Protects page tables and some counters */
312 struct list_head mmlist
; /* List of maybe swapped mm's. These are globally strung
313 * together off init_mm.mmlist, and are protected
317 /* Special counters, in some configurations protected by the
318 * page_table_lock, in other configurations by being atomic.
320 mm_counter_t _file_rss
;
321 mm_counter_t _anon_rss
;
323 unsigned long hiwater_rss
; /* High-watermark of RSS usage */
324 unsigned long hiwater_vm
; /* High-water virtual memory usage */
326 unsigned long total_vm
, locked_vm
, shared_vm
, exec_vm
;
327 unsigned long stack_vm
, reserved_vm
, def_flags
, nr_ptes
;
328 unsigned long start_code
, end_code
, start_data
, end_data
;
329 unsigned long start_brk
, brk
, start_stack
;
330 unsigned long arg_start
, arg_end
, env_start
, env_end
;
332 unsigned long saved_auxv
[AT_VECTOR_SIZE
]; /* for /proc/PID/auxv */
335 cpumask_t cpu_vm_mask
;
337 /* Architecture-specific MM context */
338 mm_context_t context
;
340 /* Token based thrashing protection. */
341 unsigned long swap_token_time
;
344 /* coredumping support */
346 struct completion
*core_startup_done
, core_done
;
349 rwlock_t ioctx_list_lock
;
350 struct kioctx
*ioctx_list
;
353 struct sighand_struct
{
355 struct k_sigaction action
[_NSIG
];
360 extern void sighand_free_cb(struct rcu_head
*rhp
);
362 static inline void sighand_free(struct sighand_struct
*sp
)
364 call_rcu(&sp
->rcu
, sighand_free_cb
);
368 * NOTE! "signal_struct" does not have it's own
369 * locking, because a shared signal_struct always
370 * implies a shared sighand_struct, so locking
371 * sighand_struct is always a proper superset of
372 * the locking of signal_struct.
374 struct signal_struct
{
378 wait_queue_head_t wait_chldexit
; /* for wait4() */
380 /* current thread group signal load-balancing target: */
383 /* shared signal handling: */
384 struct sigpending shared_pending
;
386 /* thread group exit support */
389 * - notify group_exit_task when ->count is equal to notify_count
390 * - everyone except group_exit_task is stopped during signal delivery
391 * of fatal signals, group_exit_task processes the signal.
393 struct task_struct
*group_exit_task
;
396 /* thread group stop support, overloads group_exit_code too */
397 int group_stop_count
;
398 unsigned int flags
; /* see SIGNAL_* flags below */
400 /* POSIX.1b Interval Timers */
401 struct list_head posix_timers
;
403 /* ITIMER_REAL timer for the process */
404 struct hrtimer real_timer
;
405 struct task_struct
*tsk
;
406 ktime_t it_real_incr
;
408 /* ITIMER_PROF and ITIMER_VIRTUAL timers for the process */
409 cputime_t it_prof_expires
, it_virt_expires
;
410 cputime_t it_prof_incr
, it_virt_incr
;
412 /* job control IDs */
416 /* boolean value for session group leader */
419 struct tty_struct
*tty
; /* NULL if no tty */
422 * Cumulative resource counters for dead threads in the group,
423 * and for reaped dead child processes forked by this group.
424 * Live threads maintain their own counters and add to these
425 * in __exit_signal, except for the group leader.
427 cputime_t utime
, stime
, cutime
, cstime
;
428 unsigned long nvcsw
, nivcsw
, cnvcsw
, cnivcsw
;
429 unsigned long min_flt
, maj_flt
, cmin_flt
, cmaj_flt
;
432 * Cumulative ns of scheduled CPU time for dead threads in the
433 * group, not including a zombie group leader. (This only differs
434 * from jiffies_to_ns(utime + stime) if sched_clock uses something
435 * other than jiffies.)
437 unsigned long long sched_time
;
440 * We don't bother to synchronize most readers of this at all,
441 * because there is no reader checking a limit that actually needs
442 * to get both rlim_cur and rlim_max atomically, and either one
443 * alone is a single word that can safely be read normally.
444 * getrlimit/setrlimit use task_lock(current->group_leader) to
445 * protect this instead of the siglock, because they really
446 * have no need to disable irqs.
448 struct rlimit rlim
[RLIM_NLIMITS
];
450 struct list_head cpu_timers
[3];
452 /* keep the process-shared keyrings here so that they do the right
453 * thing in threads created with CLONE_THREAD */
455 struct key
*session_keyring
; /* keyring inherited over fork */
456 struct key
*process_keyring
; /* keyring private to this process */
460 /* Context switch must be unlocked if interrupts are to be enabled */
461 #ifdef __ARCH_WANT_INTERRUPTS_ON_CTXSW
462 # define __ARCH_WANT_UNLOCKED_CTXSW
466 * Bits in flags field of signal_struct.
468 #define SIGNAL_STOP_STOPPED 0x00000001 /* job control stop in effect */
469 #define SIGNAL_STOP_DEQUEUED 0x00000002 /* stop signal dequeued */
470 #define SIGNAL_STOP_CONTINUED 0x00000004 /* SIGCONT since WCONTINUED reap */
471 #define SIGNAL_GROUP_EXIT 0x00000008 /* group exit in progress */
475 * Priority of a process goes from 0..MAX_PRIO-1, valid RT
476 * priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL/SCHED_BATCH
477 * tasks are in the range MAX_RT_PRIO..MAX_PRIO-1. Priority
478 * values are inverted: lower p->prio value means higher priority.
480 * The MAX_USER_RT_PRIO value allows the actual maximum
481 * RT priority to be separate from the value exported to
482 * user-space. This allows kernel threads to set their
483 * priority to a value higher than any user task. Note:
484 * MAX_RT_PRIO must not be smaller than MAX_USER_RT_PRIO.
487 #define MAX_USER_RT_PRIO 100
488 #define MAX_RT_PRIO MAX_USER_RT_PRIO
490 #define MAX_PRIO (MAX_RT_PRIO + 40)
492 #define rt_task(p) (unlikely((p)->prio < MAX_RT_PRIO))
495 * Some day this will be a full-fledged user tracking system..
498 atomic_t __count
; /* reference count */
499 atomic_t processes
; /* How many processes does this user have? */
500 atomic_t files
; /* How many open files does this user have? */
501 atomic_t sigpending
; /* How many pending signals does this user have? */
502 #ifdef CONFIG_INOTIFY
503 atomic_t inotify_watches
; /* How many inotify watches does this user have? */
504 atomic_t inotify_devs
; /* How many inotify devs does this user have opened? */
506 /* protected by mq_lock */
507 unsigned long mq_bytes
; /* How many bytes can be allocated to mqueue? */
508 unsigned long locked_shm
; /* How many pages of mlocked shm ? */
511 struct key
*uid_keyring
; /* UID specific keyring */
512 struct key
*session_keyring
; /* UID's default session keyring */
515 /* Hash table maintenance information */
516 struct list_head uidhash_list
;
520 extern struct user_struct
*find_user(uid_t
);
522 extern struct user_struct root_user
;
523 #define INIT_USER (&root_user)
525 typedef struct prio_array prio_array_t
;
526 struct backing_dev_info
;
527 struct reclaim_state
;
529 #ifdef CONFIG_SCHEDSTATS
531 /* cumulative counters */
532 unsigned long cpu_time
, /* time spent on the cpu */
533 run_delay
, /* time spent waiting on a runqueue */
534 pcnt
; /* # of timeslices run on this cpu */
537 unsigned long last_arrival
, /* when we last ran on a cpu */
538 last_queued
; /* when we were last queued to run */
541 extern struct file_operations proc_schedstat_operations
;
553 * sched-domains (multiprocessor balancing) declarations:
556 #define SCHED_LOAD_SCALE 128UL /* increase resolution of load */
558 #define SD_LOAD_BALANCE 1 /* Do load balancing on this domain. */
559 #define SD_BALANCE_NEWIDLE 2 /* Balance when about to become idle */
560 #define SD_BALANCE_EXEC 4 /* Balance on exec */
561 #define SD_BALANCE_FORK 8 /* Balance on fork, clone */
562 #define SD_WAKE_IDLE 16 /* Wake to idle CPU on task wakeup */
563 #define SD_WAKE_AFFINE 32 /* Wake task to waking CPU */
564 #define SD_WAKE_BALANCE 64 /* Perform balancing at task wakeup */
565 #define SD_SHARE_CPUPOWER 128 /* Domain members share cpu power */
568 struct sched_group
*next
; /* Must be a circular list */
572 * CPU power of this group, SCHED_LOAD_SCALE being max power for a
573 * single CPU. This is read only (except for setup, hotplug CPU).
575 unsigned long cpu_power
;
578 struct sched_domain
{
579 /* These fields must be setup */
580 struct sched_domain
*parent
; /* top domain must be null terminated */
581 struct sched_group
*groups
; /* the balancing groups of the domain */
582 cpumask_t span
; /* span of all CPUs in this domain */
583 unsigned long min_interval
; /* Minimum balance interval ms */
584 unsigned long max_interval
; /* Maximum balance interval ms */
585 unsigned int busy_factor
; /* less balancing by factor if busy */
586 unsigned int imbalance_pct
; /* No balance until over watermark */
587 unsigned long long cache_hot_time
; /* Task considered cache hot (ns) */
588 unsigned int cache_nice_tries
; /* Leave cache hot tasks for # tries */
589 unsigned int per_cpu_gain
; /* CPU % gained by adding domain cpus */
590 unsigned int busy_idx
;
591 unsigned int idle_idx
;
592 unsigned int newidle_idx
;
593 unsigned int wake_idx
;
594 unsigned int forkexec_idx
;
595 int flags
; /* See SD_* */
597 /* Runtime fields. */
598 unsigned long last_balance
; /* init to jiffies. units in jiffies */
599 unsigned int balance_interval
; /* initialise to 1. units in ms. */
600 unsigned int nr_balance_failed
; /* initialise to 0 */
602 #ifdef CONFIG_SCHEDSTATS
603 /* load_balance() stats */
604 unsigned long lb_cnt
[MAX_IDLE_TYPES
];
605 unsigned long lb_failed
[MAX_IDLE_TYPES
];
606 unsigned long lb_balanced
[MAX_IDLE_TYPES
];
607 unsigned long lb_imbalance
[MAX_IDLE_TYPES
];
608 unsigned long lb_gained
[MAX_IDLE_TYPES
];
609 unsigned long lb_hot_gained
[MAX_IDLE_TYPES
];
610 unsigned long lb_nobusyg
[MAX_IDLE_TYPES
];
611 unsigned long lb_nobusyq
[MAX_IDLE_TYPES
];
613 /* Active load balancing */
614 unsigned long alb_cnt
;
615 unsigned long alb_failed
;
616 unsigned long alb_pushed
;
618 /* SD_BALANCE_EXEC stats */
619 unsigned long sbe_cnt
;
620 unsigned long sbe_balanced
;
621 unsigned long sbe_pushed
;
623 /* SD_BALANCE_FORK stats */
624 unsigned long sbf_cnt
;
625 unsigned long sbf_balanced
;
626 unsigned long sbf_pushed
;
628 /* try_to_wake_up() stats */
629 unsigned long ttwu_wake_remote
;
630 unsigned long ttwu_move_affine
;
631 unsigned long ttwu_move_balance
;
635 extern void partition_sched_domains(cpumask_t
*partition1
,
636 cpumask_t
*partition2
);
639 * Maximum cache size the migration-costs auto-tuning code will
642 extern unsigned int max_cache_size
;
644 #endif /* CONFIG_SMP */
647 struct io_context
; /* See blkdev.h */
648 void exit_io_context(void);
651 #define NGROUPS_SMALL 32
652 #define NGROUPS_PER_BLOCK ((int)(PAGE_SIZE / sizeof(gid_t)))
656 gid_t small_block
[NGROUPS_SMALL
];
662 * get_group_info() must be called with the owning task locked (via task_lock())
663 * when task != current. The reason being that the vast majority of callers are
664 * looking at current->group_info, which can not be changed except by the
665 * current task. Changing current->group_info requires the task lock, too.
667 #define get_group_info(group_info) do { \
668 atomic_inc(&(group_info)->usage); \
671 #define put_group_info(group_info) do { \
672 if (atomic_dec_and_test(&(group_info)->usage)) \
673 groups_free(group_info); \
676 extern struct group_info
*groups_alloc(int gidsetsize
);
677 extern void groups_free(struct group_info
*group_info
);
678 extern int set_current_groups(struct group_info
*group_info
);
679 extern int groups_search(struct group_info
*group_info
, gid_t grp
);
680 /* access the groups "array" with this macro */
681 #define GROUP_AT(gi, i) \
682 ((gi)->blocks[(i)/NGROUPS_PER_BLOCK][(i)%NGROUPS_PER_BLOCK])
684 #ifdef ARCH_HAS_PREFETCH_SWITCH_STACK
685 extern void prefetch_stack(struct task_struct
*);
687 static inline void prefetch_stack(struct task_struct
*t
) { }
690 struct audit_context
; /* See audit.c */
694 volatile long state
; /* -1 unrunnable, 0 runnable, >0 stopped */
695 struct thread_info
*thread_info
;
697 unsigned long flags
; /* per process flags, defined below */
698 unsigned long ptrace
;
700 int lock_depth
; /* BKL lock depth */
702 #if defined(CONFIG_SMP) && defined(__ARCH_WANT_UNLOCKED_CTXSW)
705 int prio
, static_prio
;
706 struct list_head run_list
;
709 unsigned short ioprio
;
710 unsigned int btrace_seq
;
712 unsigned long sleep_avg
;
713 unsigned long long timestamp
, last_ran
;
714 unsigned long long sched_time
; /* sched_clock time spent running */
717 unsigned long policy
;
718 cpumask_t cpus_allowed
;
719 unsigned int time_slice
, first_time_slice
;
721 #ifdef CONFIG_SCHEDSTATS
722 struct sched_info sched_info
;
725 struct list_head tasks
;
727 * ptrace_list/ptrace_children forms the list of my children
728 * that were stolen by a ptracer.
730 struct list_head ptrace_children
;
731 struct list_head ptrace_list
;
733 struct mm_struct
*mm
, *active_mm
;
736 struct linux_binfmt
*binfmt
;
738 int exit_code
, exit_signal
;
739 int pdeath_signal
; /* The signal sent when the parent dies */
741 unsigned long personality
;
746 * pointers to (original) parent process, youngest child, younger sibling,
747 * older sibling, respectively. (p->father can be replaced with
750 struct task_struct
*real_parent
; /* real parent process (when being debugged) */
751 struct task_struct
*parent
; /* parent process */
753 * children/sibling forms the list of my children plus the
754 * tasks I'm ptracing.
756 struct list_head children
; /* list of my children */
757 struct list_head sibling
; /* linkage in my parent's children list */
758 struct task_struct
*group_leader
; /* threadgroup leader */
760 /* PID/PID hash table linkage. */
761 struct pid pids
[PIDTYPE_MAX
];
763 struct completion
*vfork_done
; /* for vfork() */
764 int __user
*set_child_tid
; /* CLONE_CHILD_SETTID */
765 int __user
*clear_child_tid
; /* CLONE_CHILD_CLEARTID */
767 unsigned long rt_priority
;
768 cputime_t utime
, stime
;
769 unsigned long nvcsw
, nivcsw
; /* context switch counts */
770 struct timespec start_time
;
771 /* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */
772 unsigned long min_flt
, maj_flt
;
774 cputime_t it_prof_expires
, it_virt_expires
;
775 unsigned long long it_sched_expires
;
776 struct list_head cpu_timers
[3];
778 /* process credentials */
779 uid_t uid
,euid
,suid
,fsuid
;
780 gid_t gid
,egid
,sgid
,fsgid
;
781 struct group_info
*group_info
;
782 kernel_cap_t cap_effective
, cap_inheritable
, cap_permitted
;
783 unsigned keep_capabilities
:1;
784 struct user_struct
*user
;
786 struct key
*request_key_auth
; /* assumed request_key authority */
787 struct key
*thread_keyring
; /* keyring private to this thread */
788 unsigned char jit_keyring
; /* default keyring to attach requested keys to */
790 int oomkilladj
; /* OOM kill score adjustment (bit shift). */
791 char comm
[TASK_COMM_LEN
]; /* executable name excluding path
792 - access with [gs]et_task_comm (which lock
794 - initialized normally by flush_old_exec */
795 /* file system info */
796 int link_count
, total_link_count
;
798 struct sysv_sem sysvsem
;
799 /* CPU-specific state of this task */
800 struct thread_struct thread
;
801 /* filesystem information */
802 struct fs_struct
*fs
;
803 /* open file information */
804 struct files_struct
*files
;
806 struct namespace *namespace;
807 /* signal handlers */
808 struct signal_struct
*signal
;
809 struct sighand_struct
*sighand
;
811 sigset_t blocked
, real_blocked
;
812 sigset_t saved_sigmask
; /* To be restored with TIF_RESTORE_SIGMASK */
813 struct sigpending pending
;
815 unsigned long sas_ss_sp
;
817 int (*notifier
)(void *priv
);
819 sigset_t
*notifier_mask
;
822 struct audit_context
*audit_context
;
825 /* Thread group tracking */
828 /* Protection of (de-)allocation: mm, files, fs, tty, keyrings */
829 spinlock_t alloc_lock
;
830 /* Protection of proc_dentry: nesting proc_lock, dcache_lock, write_lock_irq(&tasklist_lock); */
831 spinlock_t proc_lock
;
833 #ifdef CONFIG_DEBUG_MUTEXES
834 /* mutex deadlock detection */
835 struct mutex_waiter
*blocked_on
;
838 /* journalling filesystem info */
842 struct reclaim_state
*reclaim_state
;
844 struct dentry
*proc_dentry
;
845 struct backing_dev_info
*backing_dev_info
;
847 struct io_context
*io_context
;
849 unsigned long ptrace_message
;
850 siginfo_t
*last_siginfo
; /* For ptrace use. */
852 * current io wait handle: wait queue entry to use for io waits
853 * If this thread is processing aio, this points at the waitqueue
854 * inside the currently handled kiocb. It may be NULL (i.e. default
855 * to a stack based synchronous wait) if its doing sync IO.
857 wait_queue_t
*io_wait
;
858 /* i/o counters(bytes read/written, #syscalls */
859 u64 rchar
, wchar
, syscr
, syscw
;
860 #if defined(CONFIG_BSD_PROCESS_ACCT)
861 u64 acct_rss_mem1
; /* accumulated rss usage */
862 u64 acct_vm_mem1
; /* accumulated virtual memory usage */
863 clock_t acct_stimexpd
; /* clock_t-converted stime since last update */
866 struct mempolicy
*mempolicy
;
869 #ifdef CONFIG_CPUSETS
870 struct cpuset
*cpuset
;
871 nodemask_t mems_allowed
;
872 int cpuset_mems_generation
;
873 int cpuset_mem_spread_rotor
;
875 atomic_t fs_excl
; /* holding fs exclusive resources */
879 static inline pid_t
process_group(struct task_struct
*tsk
)
881 return tsk
->signal
->pgrp
;
885 * pid_alive - check that a task structure is not stale
886 * @p: Task structure to be checked.
888 * Test if a process is not yet dead (at most zombie state)
889 * If pid_alive fails, then pointers within the task structure
890 * can be stale and must not be dereferenced.
892 static inline int pid_alive(struct task_struct
*p
)
894 return p
->pids
[PIDTYPE_PID
].nr
!= 0;
897 extern void free_task(struct task_struct
*tsk
);
898 #define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0)
900 extern void __put_task_struct_cb(struct rcu_head
*rhp
);
902 static inline void put_task_struct(struct task_struct
*t
)
904 if (atomic_dec_and_test(&t
->usage
))
905 call_rcu(&t
->rcu
, __put_task_struct_cb
);
911 #define PF_ALIGNWARN 0x00000001 /* Print alignment warning msgs */
912 /* Not implemented yet, only for 486*/
913 #define PF_STARTING 0x00000002 /* being created */
914 #define PF_EXITING 0x00000004 /* getting shut down */
915 #define PF_DEAD 0x00000008 /* Dead */
916 #define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */
917 #define PF_SUPERPRIV 0x00000100 /* used super-user privileges */
918 #define PF_DUMPCORE 0x00000200 /* dumped core */
919 #define PF_SIGNALED 0x00000400 /* killed by a signal */
920 #define PF_MEMALLOC 0x00000800 /* Allocating memory */
921 #define PF_FLUSHER 0x00001000 /* responsible for disk writeback */
922 #define PF_USED_MATH 0x00002000 /* if unset the fpu must be initialized before use */
923 #define PF_FREEZE 0x00004000 /* this task is being frozen for suspend now */
924 #define PF_NOFREEZE 0x00008000 /* this thread should not be frozen */
925 #define PF_FROZEN 0x00010000 /* frozen for system suspend */
926 #define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */
927 #define PF_KSWAPD 0x00040000 /* I am kswapd */
928 #define PF_SWAPOFF 0x00080000 /* I am in swapoff */
929 #define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */
930 #define PF_SYNCWRITE 0x00200000 /* I am doing a sync write */
931 #define PF_BORROWED_MM 0x00400000 /* I am a kthread doing use_mm */
932 #define PF_RANDOMIZE 0x00800000 /* randomize virtual address space */
933 #define PF_SWAPWRITE 0x01000000 /* Allowed to write to swap */
934 #define PF_SPREAD_PAGE 0x04000000 /* Spread page cache over cpuset */
935 #define PF_SPREAD_SLAB 0x08000000 /* Spread some slab caches over cpuset */
936 #define PF_MEMPOLICY 0x10000000 /* Non-default NUMA mempolicy */
939 * Only the _current_ task can read/write to tsk->flags, but other
940 * tasks can access tsk->flags in readonly mode for example
941 * with tsk_used_math (like during threaded core dumping).
942 * There is however an exception to this rule during ptrace
943 * or during fork: the ptracer task is allowed to write to the
944 * child->flags of its traced child (same goes for fork, the parent
945 * can write to the child->flags), because we're guaranteed the
946 * child is not running and in turn not changing child->flags
947 * at the same time the parent does it.
949 #define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0)
950 #define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0)
951 #define clear_used_math() clear_stopped_child_used_math(current)
952 #define set_used_math() set_stopped_child_used_math(current)
953 #define conditional_stopped_child_used_math(condition, child) \
954 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0)
955 #define conditional_used_math(condition) \
956 conditional_stopped_child_used_math(condition, current)
957 #define copy_to_stopped_child_used_math(child) \
958 do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0)
959 /* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */
960 #define tsk_used_math(p) ((p)->flags & PF_USED_MATH)
961 #define used_math() tsk_used_math(current)
964 extern int set_cpus_allowed(task_t
*p
, cpumask_t new_mask
);
966 static inline int set_cpus_allowed(task_t
*p
, cpumask_t new_mask
)
968 if (!cpu_isset(0, new_mask
))
974 extern unsigned long long sched_clock(void);
975 extern unsigned long long current_sched_time(const task_t
*current_task
);
977 /* sched_exec is called by processes performing an exec */
979 extern void sched_exec(void);
981 #define sched_exec() {}
984 #ifdef CONFIG_HOTPLUG_CPU
985 extern void idle_task_exit(void);
987 static inline void idle_task_exit(void) {}
990 extern void sched_idle_next(void);
991 extern void set_user_nice(task_t
*p
, long nice
);
992 extern int task_prio(const task_t
*p
);
993 extern int task_nice(const task_t
*p
);
994 extern int can_nice(const task_t
*p
, const int nice
);
995 extern int task_curr(const task_t
*p
);
996 extern int idle_cpu(int cpu
);
997 extern int sched_setscheduler(struct task_struct
*, int, struct sched_param
*);
998 extern task_t
*idle_task(int cpu
);
999 extern task_t
*curr_task(int cpu
);
1000 extern void set_curr_task(int cpu
, task_t
*p
);
1005 * The default (Linux) execution domain.
1007 extern struct exec_domain default_exec_domain
;
1009 union thread_union
{
1010 struct thread_info thread_info
;
1011 unsigned long stack
[THREAD_SIZE
/sizeof(long)];
1014 #ifndef __HAVE_ARCH_KSTACK_END
1015 static inline int kstack_end(void *addr
)
1017 /* Reliable end of stack detection:
1018 * Some APM bios versions misalign the stack
1020 return !(((unsigned long)addr
+sizeof(void*)-1) & (THREAD_SIZE
-sizeof(void*)));
1024 extern union thread_union init_thread_union
;
1025 extern struct task_struct init_task
;
1027 extern struct mm_struct init_mm
;
1029 #define find_task_by_pid(nr) find_task_by_pid_type(PIDTYPE_PID, nr)
1030 extern struct task_struct
*find_task_by_pid_type(int type
, int pid
);
1031 extern void set_special_pids(pid_t session
, pid_t pgrp
);
1032 extern void __set_special_pids(pid_t session
, pid_t pgrp
);
1034 /* per-UID process charging. */
1035 extern struct user_struct
* alloc_uid(uid_t
);
1036 static inline struct user_struct
*get_uid(struct user_struct
*u
)
1038 atomic_inc(&u
->__count
);
1041 extern void free_uid(struct user_struct
*);
1042 extern void switch_uid(struct user_struct
*);
1044 #include <asm/current.h>
1046 extern void do_timer(struct pt_regs
*);
1048 extern int FASTCALL(wake_up_state(struct task_struct
* tsk
, unsigned int state
));
1049 extern int FASTCALL(wake_up_process(struct task_struct
* tsk
));
1050 extern void FASTCALL(wake_up_new_task(struct task_struct
* tsk
,
1051 unsigned long clone_flags
));
1053 extern void kick_process(struct task_struct
*tsk
);
1055 static inline void kick_process(struct task_struct
*tsk
) { }
1057 extern void FASTCALL(sched_fork(task_t
* p
, int clone_flags
));
1058 extern void FASTCALL(sched_exit(task_t
* p
));
1060 extern int in_group_p(gid_t
);
1061 extern int in_egroup_p(gid_t
);
1063 extern void proc_caches_init(void);
1064 extern void flush_signals(struct task_struct
*);
1065 extern void flush_signal_handlers(struct task_struct
*, int force_default
);
1066 extern int dequeue_signal(struct task_struct
*tsk
, sigset_t
*mask
, siginfo_t
*info
);
1068 static inline int dequeue_signal_lock(struct task_struct
*tsk
, sigset_t
*mask
, siginfo_t
*info
)
1070 unsigned long flags
;
1073 spin_lock_irqsave(&tsk
->sighand
->siglock
, flags
);
1074 ret
= dequeue_signal(tsk
, mask
, info
);
1075 spin_unlock_irqrestore(&tsk
->sighand
->siglock
, flags
);
1080 extern void block_all_signals(int (*notifier
)(void *priv
), void *priv
,
1082 extern void unblock_all_signals(void);
1083 extern void release_task(struct task_struct
* p
);
1084 extern int send_sig_info(int, struct siginfo
*, struct task_struct
*);
1085 extern int send_group_sig_info(int, struct siginfo
*, struct task_struct
*);
1086 extern int force_sigsegv(int, struct task_struct
*);
1087 extern int force_sig_info(int, struct siginfo
*, struct task_struct
*);
1088 extern int __kill_pg_info(int sig
, struct siginfo
*info
, pid_t pgrp
);
1089 extern int kill_pg_info(int, struct siginfo
*, pid_t
);
1090 extern int kill_proc_info(int, struct siginfo
*, pid_t
);
1091 extern int kill_proc_info_as_uid(int, struct siginfo
*, pid_t
, uid_t
, uid_t
);
1092 extern void do_notify_parent(struct task_struct
*, int);
1093 extern void force_sig(int, struct task_struct
*);
1094 extern void force_sig_specific(int, struct task_struct
*);
1095 extern int send_sig(int, struct task_struct
*, int);
1096 extern void zap_other_threads(struct task_struct
*p
);
1097 extern int kill_pg(pid_t
, int, int);
1098 extern int kill_sl(pid_t
, int, int);
1099 extern int kill_proc(pid_t
, int, int);
1100 extern struct sigqueue
*sigqueue_alloc(void);
1101 extern void sigqueue_free(struct sigqueue
*);
1102 extern int send_sigqueue(int, struct sigqueue
*, struct task_struct
*);
1103 extern int send_group_sigqueue(int, struct sigqueue
*, struct task_struct
*);
1104 extern int do_sigaction(int, struct k_sigaction
*, struct k_sigaction
*);
1105 extern int do_sigaltstack(const stack_t __user
*, stack_t __user
*, unsigned long);
1107 /* These can be the second arg to send_sig_info/send_group_sig_info. */
1108 #define SEND_SIG_NOINFO ((struct siginfo *) 0)
1109 #define SEND_SIG_PRIV ((struct siginfo *) 1)
1110 #define SEND_SIG_FORCED ((struct siginfo *) 2)
1112 static inline int is_si_special(const struct siginfo
*info
)
1114 return info
<= SEND_SIG_FORCED
;
1117 /* True if we are on the alternate signal stack. */
1119 static inline int on_sig_stack(unsigned long sp
)
1121 return (sp
- current
->sas_ss_sp
< current
->sas_ss_size
);
1124 static inline int sas_ss_flags(unsigned long sp
)
1126 return (current
->sas_ss_size
== 0 ? SS_DISABLE
1127 : on_sig_stack(sp
) ? SS_ONSTACK
: 0);
1131 * Routines for handling mm_structs
1133 extern struct mm_struct
* mm_alloc(void);
1135 /* mmdrop drops the mm and the page tables */
1136 extern void FASTCALL(__mmdrop(struct mm_struct
*));
1137 static inline void mmdrop(struct mm_struct
* mm
)
1139 if (atomic_dec_and_test(&mm
->mm_count
))
1143 /* mmput gets rid of the mappings and all user-space */
1144 extern void mmput(struct mm_struct
*);
1145 /* Grab a reference to a task's mm, if it is not already going away */
1146 extern struct mm_struct
*get_task_mm(struct task_struct
*task
);
1147 /* Remove the current tasks stale references to the old mm_struct */
1148 extern void mm_release(struct task_struct
*, struct mm_struct
*);
1150 extern int copy_thread(int, unsigned long, unsigned long, unsigned long, struct task_struct
*, struct pt_regs
*);
1151 extern void flush_thread(void);
1152 extern void exit_thread(void);
1154 extern void exit_files(struct task_struct
*);
1155 extern void exit_signal(struct task_struct
*);
1156 extern void __exit_signal(struct task_struct
*);
1157 extern void exit_sighand(struct task_struct
*);
1158 extern void __exit_sighand(struct task_struct
*);
1159 extern void exit_itimers(struct signal_struct
*);
1161 extern NORET_TYPE
void do_group_exit(int);
1163 extern void daemonize(const char *, ...);
1164 extern int allow_signal(int);
1165 extern int disallow_signal(int);
1166 extern task_t
*child_reaper
;
1168 extern int do_execve(char *, char __user
* __user
*, char __user
* __user
*, struct pt_regs
*);
1169 extern long do_fork(unsigned long, unsigned long, struct pt_regs
*, unsigned long, int __user
*, int __user
*);
1170 task_t
*fork_idle(int);
1172 extern void set_task_comm(struct task_struct
*tsk
, char *from
);
1173 extern void get_task_comm(char *to
, struct task_struct
*tsk
);
1176 extern void wait_task_inactive(task_t
* p
);
1178 #define wait_task_inactive(p) do { } while (0)
1181 #define remove_parent(p) list_del_init(&(p)->sibling)
1182 #define add_parent(p, parent) list_add_tail(&(p)->sibling,&(parent)->children)
1184 #define REMOVE_LINKS(p) do { \
1185 if (thread_group_leader(p)) \
1186 list_del_init(&(p)->tasks); \
1190 #define SET_LINKS(p) do { \
1191 if (thread_group_leader(p)) \
1192 list_add_tail(&(p)->tasks,&init_task.tasks); \
1193 add_parent(p, (p)->parent); \
1196 #define next_task(p) list_entry((p)->tasks.next, struct task_struct, tasks)
1197 #define prev_task(p) list_entry((p)->tasks.prev, struct task_struct, tasks)
1199 #define for_each_process(p) \
1200 for (p = &init_task ; (p = next_task(p)) != &init_task ; )
1203 * Careful: do_each_thread/while_each_thread is a double loop so
1204 * 'break' will not work as expected - use goto instead.
1206 #define do_each_thread(g, t) \
1207 for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do
1209 #define while_each_thread(g, t) \
1210 while ((t = next_thread(t)) != g)
1212 extern task_t
* FASTCALL(next_thread(const task_t
*p
));
1214 #define thread_group_leader(p) (p->pid == p->tgid)
1216 static inline int thread_group_empty(task_t
*p
)
1218 return list_empty(&p
->pids
[PIDTYPE_TGID
].pid_list
);
1221 #define delay_group_leader(p) \
1222 (thread_group_leader(p) && !thread_group_empty(p))
1224 extern void unhash_process(struct task_struct
*p
);
1227 * Protects ->fs, ->files, ->mm, ->ptrace, ->group_info, ->comm, keyring
1228 * subscriptions and synchronises with wait4(). Also used in procfs. Also
1229 * pins the final release of task.io_context. Also protects ->cpuset.
1231 * Nests both inside and outside of read_lock(&tasklist_lock).
1232 * It must not be nested with write_lock_irq(&tasklist_lock),
1233 * neither inside nor outside.
1235 static inline void task_lock(struct task_struct
*p
)
1237 spin_lock(&p
->alloc_lock
);
1240 static inline void task_unlock(struct task_struct
*p
)
1242 spin_unlock(&p
->alloc_lock
);
1245 #ifndef __HAVE_THREAD_FUNCTIONS
1247 #define task_thread_info(task) (task)->thread_info
1248 #define task_stack_page(task) ((void*)((task)->thread_info))
1250 static inline void setup_thread_stack(struct task_struct
*p
, struct task_struct
*org
)
1252 *task_thread_info(p
) = *task_thread_info(org
);
1253 task_thread_info(p
)->task
= p
;
1256 static inline unsigned long *end_of_stack(struct task_struct
*p
)
1258 return (unsigned long *)(p
->thread_info
+ 1);
1263 /* set thread flags in other task's structures
1264 * - see asm/thread_info.h for TIF_xxxx flags available
1266 static inline void set_tsk_thread_flag(struct task_struct
*tsk
, int flag
)
1268 set_ti_thread_flag(task_thread_info(tsk
), flag
);
1271 static inline void clear_tsk_thread_flag(struct task_struct
*tsk
, int flag
)
1273 clear_ti_thread_flag(task_thread_info(tsk
), flag
);
1276 static inline int test_and_set_tsk_thread_flag(struct task_struct
*tsk
, int flag
)
1278 return test_and_set_ti_thread_flag(task_thread_info(tsk
), flag
);
1281 static inline int test_and_clear_tsk_thread_flag(struct task_struct
*tsk
, int flag
)
1283 return test_and_clear_ti_thread_flag(task_thread_info(tsk
), flag
);
1286 static inline int test_tsk_thread_flag(struct task_struct
*tsk
, int flag
)
1288 return test_ti_thread_flag(task_thread_info(tsk
), flag
);
1291 static inline void set_tsk_need_resched(struct task_struct
*tsk
)
1293 set_tsk_thread_flag(tsk
,TIF_NEED_RESCHED
);
1296 static inline void clear_tsk_need_resched(struct task_struct
*tsk
)
1298 clear_tsk_thread_flag(tsk
,TIF_NEED_RESCHED
);
1301 static inline int signal_pending(struct task_struct
*p
)
1303 return unlikely(test_tsk_thread_flag(p
,TIF_SIGPENDING
));
1306 static inline int need_resched(void)
1308 return unlikely(test_thread_flag(TIF_NEED_RESCHED
));
1312 * cond_resched() and cond_resched_lock(): latency reduction via
1313 * explicit rescheduling in places that are safe. The return
1314 * value indicates whether a reschedule was done in fact.
1315 * cond_resched_lock() will drop the spinlock before scheduling,
1316 * cond_resched_softirq() will enable bhs before scheduling.
1318 extern int cond_resched(void);
1319 extern int cond_resched_lock(spinlock_t
* lock
);
1320 extern int cond_resched_softirq(void);
1323 * Does a critical section need to be broken due to another
1326 #if defined(CONFIG_PREEMPT) && defined(CONFIG_SMP)
1327 # define need_lockbreak(lock) ((lock)->break_lock)
1329 # define need_lockbreak(lock) 0
1333 * Does a critical section need to be broken due to another
1334 * task waiting or preemption being signalled:
1336 static inline int lock_need_resched(spinlock_t
*lock
)
1338 if (need_lockbreak(lock
) || need_resched())
1343 /* Reevaluate whether the task has signals pending delivery.
1344 This is required every time the blocked sigset_t changes.
1345 callers must hold sighand->siglock. */
1347 extern FASTCALL(void recalc_sigpending_tsk(struct task_struct
*t
));
1348 extern void recalc_sigpending(void);
1350 extern void signal_wake_up(struct task_struct
*t
, int resume_stopped
);
1353 * Wrappers for p->thread_info->cpu access. No-op on UP.
1357 static inline unsigned int task_cpu(const struct task_struct
*p
)
1359 return task_thread_info(p
)->cpu
;
1362 static inline void set_task_cpu(struct task_struct
*p
, unsigned int cpu
)
1364 task_thread_info(p
)->cpu
= cpu
;
1369 static inline unsigned int task_cpu(const struct task_struct
*p
)
1374 static inline void set_task_cpu(struct task_struct
*p
, unsigned int cpu
)
1378 #endif /* CONFIG_SMP */
1380 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1381 extern void arch_pick_mmap_layout(struct mm_struct
*mm
);
1383 static inline void arch_pick_mmap_layout(struct mm_struct
*mm
)
1385 mm
->mmap_base
= TASK_UNMAPPED_BASE
;
1386 mm
->get_unmapped_area
= arch_get_unmapped_area
;
1387 mm
->unmap_area
= arch_unmap_area
;
1391 extern long sched_setaffinity(pid_t pid
, cpumask_t new_mask
);
1392 extern long sched_getaffinity(pid_t pid
, cpumask_t
*mask
);
1394 extern void normalize_rt_tasks(void);
1398 * Check if a process has been frozen
1400 static inline int frozen(struct task_struct
*p
)
1402 return p
->flags
& PF_FROZEN
;
1406 * Check if there is a request to freeze a process
1408 static inline int freezing(struct task_struct
*p
)
1410 return p
->flags
& PF_FREEZE
;
1414 * Request that a process be frozen
1415 * FIXME: SMP problem. We may not modify other process' flags!
1417 static inline void freeze(struct task_struct
*p
)
1419 p
->flags
|= PF_FREEZE
;
1423 * Wake up a frozen process
1425 static inline int thaw_process(struct task_struct
*p
)
1428 p
->flags
&= ~PF_FROZEN
;
1436 * freezing is complete, mark process as frozen
1438 static inline void frozen_process(struct task_struct
*p
)
1440 p
->flags
= (p
->flags
& ~PF_FREEZE
) | PF_FROZEN
;
1443 extern void refrigerator(void);
1444 extern int freeze_processes(void);
1445 extern void thaw_processes(void);
1447 static inline int try_to_freeze(void)
1449 if (freezing(current
)) {
1456 static inline int frozen(struct task_struct
*p
) { return 0; }
1457 static inline int freezing(struct task_struct
*p
) { return 0; }
1458 static inline void freeze(struct task_struct
*p
) { BUG(); }
1459 static inline int thaw_process(struct task_struct
*p
) { return 1; }
1460 static inline void frozen_process(struct task_struct
*p
) { BUG(); }
1462 static inline void refrigerator(void) {}
1463 static inline int freeze_processes(void) { BUG(); return 0; }
1464 static inline void thaw_processes(void) {}
1466 static inline int try_to_freeze(void) { return 0; }
1468 #endif /* CONFIG_PM */
1469 #endif /* __KERNEL__ */