sched/headers: Move task_struct::signal and task_struct::sighand types and accessors into <linux/sched/signal.h>
task_struct::signal and task_struct::sighand are pointers, which would normally make it straightforward to not define those types in sched.h. That is not so, because the types are accompanied by a myriad of APIs (macros and inline functions) that dereference them. Split the types and the APIs out of sched.h and move them into a new header, <linux/sched/signal.h>. With this change sched.h does not know about 'struct signal' and 'struct sighand' anymore, trying to put accessors into sched.h as a test fails the following way: ./include/linux/sched.h: In function ‘test_signal_types’: ./include/linux/sched.h:2461:18: error: dereferencing pointer to incomplete type ‘struct signal_struct’ ^ This reduces the size and complexity of sched.h significantly. Update all headers and .c code that relied on getting the signal handling functionality from <linux/sched.h> to include <linux/sched/signal.h>. The list of affected files in the preparatory patch was partly generated by grepping for the APIs, and partly by doing coverage build testing, both all[yes|mod|def|no]config builds on 64-bit and 32-bit x86, and an array of cross-architecture builds. Nevertheless some (trivial) build breakage is still expected related to rare Kconfig combinations and in-flight patches to various kernel code, but most of it should be handled by this patch. Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
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@ -31,7 +31,7 @@
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/signal.h>
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#include <linux/sched.h>
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#include <linux/sched/signal.h>
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#include <linux/init.h>
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#include <asm/thread_notify.h>
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|
|
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@ -10,8 +10,7 @@
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*
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* FIXME! These routines have not been tested for big endian case.
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*/
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#include <linux/sched.h>
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#include <linux/signal.h>
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#include <linux/sched/signal.h>
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#include <linux/io.h>
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#include <cpu/fpu.h>
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#include <asm/processor.h>
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|
|
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@ -8,7 +8,7 @@
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#include <linux/module.h>
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#include <linux/skbuff.h>
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#include <linux/cache.h>
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#include <linux/sched.h>
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#include <linux/sched/signal.h>
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#include <linux/types.h>
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#include <linux/slab.h>
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#include <linux/wait.h>
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|
|
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@ -71,6 +71,9 @@ struct blk_plug;
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struct filename;
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struct nameidata;
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struct signal_struct;
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struct sighand_struct;
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extern unsigned long total_forks;
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extern int nr_threads;
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DECLARE_PER_CPU(unsigned long, process_counts);
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|
@ -361,13 +364,6 @@ arch_get_unmapped_area_topdown(struct file *filp, unsigned long addr,
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static inline void arch_pick_mmap_layout(struct mm_struct *mm) {}
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#endif
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struct sighand_struct {
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atomic_t count;
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struct k_sigaction action[_NSIG];
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spinlock_t siglock;
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wait_queue_head_t signalfd_wqh;
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};
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struct pacct_struct {
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int ac_flag;
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long ac_exitcode;
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@ -485,195 +481,6 @@ struct thread_group_cputimer {
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#include <linux/rwsem.h>
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struct autogroup;
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/*
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* NOTE! "signal_struct" does not have its own
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* locking, because a shared signal_struct always
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* implies a shared sighand_struct, so locking
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* sighand_struct is always a proper superset of
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* the locking of signal_struct.
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*/
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struct signal_struct {
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atomic_t sigcnt;
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atomic_t live;
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int nr_threads;
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struct list_head thread_head;
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wait_queue_head_t wait_chldexit; /* for wait4() */
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/* current thread group signal load-balancing target: */
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struct task_struct *curr_target;
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/* shared signal handling: */
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struct sigpending shared_pending;
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/* thread group exit support */
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int group_exit_code;
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/* overloaded:
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* - notify group_exit_task when ->count is equal to notify_count
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* - everyone except group_exit_task is stopped during signal delivery
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* of fatal signals, group_exit_task processes the signal.
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*/
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int notify_count;
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struct task_struct *group_exit_task;
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/* thread group stop support, overloads group_exit_code too */
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int group_stop_count;
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unsigned int flags; /* see SIGNAL_* flags below */
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/*
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* PR_SET_CHILD_SUBREAPER marks a process, like a service
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* manager, to re-parent orphan (double-forking) child processes
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* to this process instead of 'init'. The service manager is
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* able to receive SIGCHLD signals and is able to investigate
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* the process until it calls wait(). All children of this
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* process will inherit a flag if they should look for a
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* child_subreaper process at exit.
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*/
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unsigned int is_child_subreaper:1;
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unsigned int has_child_subreaper:1;
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#ifdef CONFIG_POSIX_TIMERS
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/* POSIX.1b Interval Timers */
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int posix_timer_id;
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struct list_head posix_timers;
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/* ITIMER_REAL timer for the process */
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struct hrtimer real_timer;
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ktime_t it_real_incr;
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/*
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* ITIMER_PROF and ITIMER_VIRTUAL timers for the process, we use
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* CPUCLOCK_PROF and CPUCLOCK_VIRT for indexing array as these
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* values are defined to 0 and 1 respectively
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*/
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struct cpu_itimer it[2];
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/*
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* Thread group totals for process CPU timers.
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* See thread_group_cputimer(), et al, for details.
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*/
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struct thread_group_cputimer cputimer;
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/* Earliest-expiration cache. */
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struct task_cputime cputime_expires;
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struct list_head cpu_timers[3];
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#endif
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struct pid *leader_pid;
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#ifdef CONFIG_NO_HZ_FULL
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atomic_t tick_dep_mask;
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#endif
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struct pid *tty_old_pgrp;
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/* boolean value for session group leader */
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int leader;
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struct tty_struct *tty; /* NULL if no tty */
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#ifdef CONFIG_SCHED_AUTOGROUP
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struct autogroup *autogroup;
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#endif
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/*
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* Cumulative resource counters for dead threads in the group,
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* and for reaped dead child processes forked by this group.
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* Live threads maintain their own counters and add to these
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* in __exit_signal, except for the group leader.
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*/
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seqlock_t stats_lock;
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u64 utime, stime, cutime, cstime;
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u64 gtime;
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u64 cgtime;
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struct prev_cputime prev_cputime;
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unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw;
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unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt;
|
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unsigned long inblock, oublock, cinblock, coublock;
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unsigned long maxrss, cmaxrss;
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struct task_io_accounting ioac;
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/*
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* Cumulative ns of schedule CPU time fo dead threads in the
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* group, not including a zombie group leader, (This only differs
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* from jiffies_to_ns(utime + stime) if sched_clock uses something
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* other than jiffies.)
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*/
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unsigned long long sum_sched_runtime;
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/*
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* We don't bother to synchronize most readers of this at all,
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* because there is no reader checking a limit that actually needs
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* to get both rlim_cur and rlim_max atomically, and either one
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* alone is a single word that can safely be read normally.
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* getrlimit/setrlimit use task_lock(current->group_leader) to
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* protect this instead of the siglock, because they really
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* have no need to disable irqs.
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*/
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struct rlimit rlim[RLIM_NLIMITS];
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#ifdef CONFIG_BSD_PROCESS_ACCT
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struct pacct_struct pacct; /* per-process accounting information */
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#endif
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#ifdef CONFIG_TASKSTATS
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struct taskstats *stats;
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#endif
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#ifdef CONFIG_AUDIT
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unsigned audit_tty;
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struct tty_audit_buf *tty_audit_buf;
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#endif
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/*
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* Thread is the potential origin of an oom condition; kill first on
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* oom
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*/
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bool oom_flag_origin;
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short oom_score_adj; /* OOM kill score adjustment */
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short oom_score_adj_min; /* OOM kill score adjustment min value.
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* Only settable by CAP_SYS_RESOURCE. */
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struct mm_struct *oom_mm; /* recorded mm when the thread group got
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* killed by the oom killer */
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struct mutex cred_guard_mutex; /* guard against foreign influences on
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* credential calculations
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* (notably. ptrace) */
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};
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/*
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* Bits in flags field of signal_struct.
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*/
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#define SIGNAL_STOP_STOPPED 0x00000001 /* job control stop in effect */
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#define SIGNAL_STOP_CONTINUED 0x00000002 /* SIGCONT since WCONTINUED reap */
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#define SIGNAL_GROUP_EXIT 0x00000004 /* group exit in progress */
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#define SIGNAL_GROUP_COREDUMP 0x00000008 /* coredump in progress */
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/*
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* Pending notifications to parent.
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*/
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#define SIGNAL_CLD_STOPPED 0x00000010
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#define SIGNAL_CLD_CONTINUED 0x00000020
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#define SIGNAL_CLD_MASK (SIGNAL_CLD_STOPPED|SIGNAL_CLD_CONTINUED)
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#define SIGNAL_UNKILLABLE 0x00000040 /* for init: ignore fatal signals */
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#define SIGNAL_STOP_MASK (SIGNAL_CLD_MASK | SIGNAL_STOP_STOPPED | \
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SIGNAL_STOP_CONTINUED)
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static inline void signal_set_stop_flags(struct signal_struct *sig,
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unsigned int flags)
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{
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WARN_ON(sig->flags & (SIGNAL_GROUP_EXIT|SIGNAL_GROUP_COREDUMP));
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sig->flags = (sig->flags & ~SIGNAL_STOP_MASK) | flags;
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}
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/* If true, all threads except ->group_exit_task have pending SIGKILL */
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static inline int signal_group_exit(const struct signal_struct *sig)
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{
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return (sig->flags & SIGNAL_GROUP_EXIT) ||
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(sig->group_exit_task != NULL);
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}
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/*
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* Some day this will be a full-fledged user tracking system..
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*/
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|
@ -2126,190 +1933,8 @@ extern int sched_fork(unsigned long clone_flags, struct task_struct *p);
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extern void sched_dead(struct task_struct *p);
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extern void proc_caches_init(void);
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extern void flush_signals(struct task_struct *);
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extern void ignore_signals(struct task_struct *);
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extern void flush_signal_handlers(struct task_struct *, int force_default);
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extern int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info);
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static inline int kernel_dequeue_signal(siginfo_t *info)
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{
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struct task_struct *tsk = current;
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siginfo_t __info;
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int ret;
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spin_lock_irq(&tsk->sighand->siglock);
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ret = dequeue_signal(tsk, &tsk->blocked, info ?: &__info);
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spin_unlock_irq(&tsk->sighand->siglock);
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return ret;
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}
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static inline void kernel_signal_stop(void)
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{
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spin_lock_irq(¤t->sighand->siglock);
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if (current->jobctl & JOBCTL_STOP_DEQUEUED)
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__set_current_state(TASK_STOPPED);
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spin_unlock_irq(¤t->sighand->siglock);
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|
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schedule();
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}
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extern void release_task(struct task_struct * p);
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extern int send_sig_info(int, struct siginfo *, struct task_struct *);
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extern int force_sigsegv(int, struct task_struct *);
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extern int force_sig_info(int, struct siginfo *, struct task_struct *);
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extern int __kill_pgrp_info(int sig, struct siginfo *info, struct pid *pgrp);
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extern int kill_pid_info(int sig, struct siginfo *info, struct pid *pid);
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extern int kill_pid_info_as_cred(int, struct siginfo *, struct pid *,
|
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const struct cred *, u32);
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extern int kill_pgrp(struct pid *pid, int sig, int priv);
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extern int kill_pid(struct pid *pid, int sig, int priv);
|
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extern int kill_proc_info(int, struct siginfo *, pid_t);
|
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extern __must_check bool do_notify_parent(struct task_struct *, int);
|
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extern void __wake_up_parent(struct task_struct *p, struct task_struct *parent);
|
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extern void force_sig(int, struct task_struct *);
|
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extern int send_sig(int, struct task_struct *, int);
|
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extern int zap_other_threads(struct task_struct *p);
|
||||
extern struct sigqueue *sigqueue_alloc(void);
|
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extern void sigqueue_free(struct sigqueue *);
|
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extern int send_sigqueue(struct sigqueue *, struct task_struct *, int group);
|
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extern int do_sigaction(int, struct k_sigaction *, struct k_sigaction *);
|
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|
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#ifdef TIF_RESTORE_SIGMASK
|
||||
/*
|
||||
* Legacy restore_sigmask accessors. These are inefficient on
|
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* SMP architectures because they require atomic operations.
|
||||
*/
|
||||
|
||||
/**
|
||||
* set_restore_sigmask() - make sure saved_sigmask processing gets done
|
||||
*
|
||||
* This sets TIF_RESTORE_SIGMASK and ensures that the arch signal code
|
||||
* will run before returning to user mode, to process the flag. For
|
||||
* all callers, TIF_SIGPENDING is already set or it's no harm to set
|
||||
* it. TIF_RESTORE_SIGMASK need not be in the set of bits that the
|
||||
* arch code will notice on return to user mode, in case those bits
|
||||
* are scarce. We set TIF_SIGPENDING here to ensure that the arch
|
||||
* signal code always gets run when TIF_RESTORE_SIGMASK is set.
|
||||
*/
|
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static inline void set_restore_sigmask(void)
|
||||
{
|
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set_thread_flag(TIF_RESTORE_SIGMASK);
|
||||
WARN_ON(!test_thread_flag(TIF_SIGPENDING));
|
||||
}
|
||||
static inline void clear_restore_sigmask(void)
|
||||
{
|
||||
clear_thread_flag(TIF_RESTORE_SIGMASK);
|
||||
}
|
||||
static inline bool test_restore_sigmask(void)
|
||||
{
|
||||
return test_thread_flag(TIF_RESTORE_SIGMASK);
|
||||
}
|
||||
static inline bool test_and_clear_restore_sigmask(void)
|
||||
{
|
||||
return test_and_clear_thread_flag(TIF_RESTORE_SIGMASK);
|
||||
}
|
||||
|
||||
#else /* TIF_RESTORE_SIGMASK */
|
||||
|
||||
/* Higher-quality implementation, used if TIF_RESTORE_SIGMASK doesn't exist. */
|
||||
static inline void set_restore_sigmask(void)
|
||||
{
|
||||
current->restore_sigmask = true;
|
||||
WARN_ON(!test_thread_flag(TIF_SIGPENDING));
|
||||
}
|
||||
static inline void clear_restore_sigmask(void)
|
||||
{
|
||||
current->restore_sigmask = false;
|
||||
}
|
||||
static inline bool test_restore_sigmask(void)
|
||||
{
|
||||
return current->restore_sigmask;
|
||||
}
|
||||
static inline bool test_and_clear_restore_sigmask(void)
|
||||
{
|
||||
if (!current->restore_sigmask)
|
||||
return false;
|
||||
current->restore_sigmask = false;
|
||||
return true;
|
||||
}
|
||||
#endif
|
||||
|
||||
static inline void restore_saved_sigmask(void)
|
||||
{
|
||||
if (test_and_clear_restore_sigmask())
|
||||
__set_current_blocked(¤t->saved_sigmask);
|
||||
}
|
||||
|
||||
static inline sigset_t *sigmask_to_save(void)
|
||||
{
|
||||
sigset_t *res = ¤t->blocked;
|
||||
if (unlikely(test_restore_sigmask()))
|
||||
res = ¤t->saved_sigmask;
|
||||
return res;
|
||||
}
|
||||
|
||||
static inline int kill_cad_pid(int sig, int priv)
|
||||
{
|
||||
return kill_pid(cad_pid, sig, priv);
|
||||
}
|
||||
|
||||
/* These can be the second arg to send_sig_info/send_group_sig_info. */
|
||||
#define SEND_SIG_NOINFO ((struct siginfo *) 0)
|
||||
#define SEND_SIG_PRIV ((struct siginfo *) 1)
|
||||
#define SEND_SIG_FORCED ((struct siginfo *) 2)
|
||||
|
||||
/*
|
||||
* True if we are on the alternate signal stack.
|
||||
*/
|
||||
static inline int on_sig_stack(unsigned long sp)
|
||||
{
|
||||
/*
|
||||
* If the signal stack is SS_AUTODISARM then, by construction, we
|
||||
* can't be on the signal stack unless user code deliberately set
|
||||
* SS_AUTODISARM when we were already on it.
|
||||
*
|
||||
* This improves reliability: if user state gets corrupted such that
|
||||
* the stack pointer points very close to the end of the signal stack,
|
||||
* then this check will enable the signal to be handled anyway.
|
||||
*/
|
||||
if (current->sas_ss_flags & SS_AUTODISARM)
|
||||
return 0;
|
||||
|
||||
#ifdef CONFIG_STACK_GROWSUP
|
||||
return sp >= current->sas_ss_sp &&
|
||||
sp - current->sas_ss_sp < current->sas_ss_size;
|
||||
#else
|
||||
return sp > current->sas_ss_sp &&
|
||||
sp - current->sas_ss_sp <= current->sas_ss_size;
|
||||
#endif
|
||||
}
|
||||
|
||||
static inline int sas_ss_flags(unsigned long sp)
|
||||
{
|
||||
if (!current->sas_ss_size)
|
||||
return SS_DISABLE;
|
||||
|
||||
return on_sig_stack(sp) ? SS_ONSTACK : 0;
|
||||
}
|
||||
|
||||
static inline void sas_ss_reset(struct task_struct *p)
|
||||
{
|
||||
p->sas_ss_sp = 0;
|
||||
p->sas_ss_size = 0;
|
||||
p->sas_ss_flags = SS_DISABLE;
|
||||
}
|
||||
|
||||
static inline unsigned long sigsp(unsigned long sp, struct ksignal *ksig)
|
||||
{
|
||||
if (unlikely((ksig->ka.sa.sa_flags & SA_ONSTACK)) && ! sas_ss_flags(sp))
|
||||
#ifdef CONFIG_STACK_GROWSUP
|
||||
return current->sas_ss_sp;
|
||||
#else
|
||||
return current->sas_ss_sp + current->sas_ss_size;
|
||||
#endif
|
||||
return sp;
|
||||
}
|
||||
|
||||
#ifdef CONFIG_HAVE_COPY_THREAD_TLS
|
||||
extern int copy_thread_tls(unsigned long, unsigned long, unsigned long,
|
||||
|
@ -2338,10 +1963,8 @@ static inline void exit_thread(struct task_struct *tsk)
|
|||
#endif
|
||||
|
||||
extern void exit_files(struct task_struct *);
|
||||
extern void __cleanup_sighand(struct sighand_struct *);
|
||||
|
||||
extern void exit_itimers(struct signal_struct *);
|
||||
extern void flush_itimer_signals(void);
|
||||
|
||||
extern void do_group_exit(int);
|
||||
|
||||
|
@ -2376,81 +1999,6 @@ static inline unsigned long wait_task_inactive(struct task_struct *p,
|
|||
}
|
||||
#endif
|
||||
|
||||
#define tasklist_empty() \
|
||||
list_empty(&init_task.tasks)
|
||||
|
||||
#define next_task(p) \
|
||||
list_entry_rcu((p)->tasks.next, struct task_struct, tasks)
|
||||
|
||||
#define for_each_process(p) \
|
||||
for (p = &init_task ; (p = next_task(p)) != &init_task ; )
|
||||
|
||||
extern bool current_is_single_threaded(void);
|
||||
|
||||
/*
|
||||
* Careful: do_each_thread/while_each_thread is a double loop so
|
||||
* 'break' will not work as expected - use goto instead.
|
||||
*/
|
||||
#define do_each_thread(g, t) \
|
||||
for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do
|
||||
|
||||
#define while_each_thread(g, t) \
|
||||
while ((t = next_thread(t)) != g)
|
||||
|
||||
#define __for_each_thread(signal, t) \
|
||||
list_for_each_entry_rcu(t, &(signal)->thread_head, thread_node)
|
||||
|
||||
#define for_each_thread(p, t) \
|
||||
__for_each_thread((p)->signal, t)
|
||||
|
||||
/* Careful: this is a double loop, 'break' won't work as expected. */
|
||||
#define for_each_process_thread(p, t) \
|
||||
for_each_process(p) for_each_thread(p, t)
|
||||
|
||||
typedef int (*proc_visitor)(struct task_struct *p, void *data);
|
||||
void walk_process_tree(struct task_struct *top, proc_visitor, void *);
|
||||
|
||||
static inline int get_nr_threads(struct task_struct *tsk)
|
||||
{
|
||||
return tsk->signal->nr_threads;
|
||||
}
|
||||
|
||||
static inline bool thread_group_leader(struct task_struct *p)
|
||||
{
|
||||
return p->exit_signal >= 0;
|
||||
}
|
||||
|
||||
/* Do to the insanities of de_thread it is possible for a process
|
||||
* to have the pid of the thread group leader without actually being
|
||||
* the thread group leader. For iteration through the pids in proc
|
||||
* all we care about is that we have a task with the appropriate
|
||||
* pid, we don't actually care if we have the right task.
|
||||
*/
|
||||
static inline bool has_group_leader_pid(struct task_struct *p)
|
||||
{
|
||||
return task_pid(p) == p->signal->leader_pid;
|
||||
}
|
||||
|
||||
static inline
|
||||
bool same_thread_group(struct task_struct *p1, struct task_struct *p2)
|
||||
{
|
||||
return p1->signal == p2->signal;
|
||||
}
|
||||
|
||||
static inline struct task_struct *next_thread(const struct task_struct *p)
|
||||
{
|
||||
return list_entry_rcu(p->thread_group.next,
|
||||
struct task_struct, thread_group);
|
||||
}
|
||||
|
||||
static inline int thread_group_empty(struct task_struct *p)
|
||||
{
|
||||
return list_empty(&p->thread_group);
|
||||
}
|
||||
|
||||
#define delay_group_leader(p) \
|
||||
(thread_group_leader(p) && !thread_group_empty(p))
|
||||
|
||||
/*
|
||||
* Protects ->fs, ->files, ->mm, ->group_info, ->comm, keyring
|
||||
* subscriptions and synchronises with wait4(). Also used in procfs. Also
|
||||
|
@ -2471,25 +2019,6 @@ static inline void task_unlock(struct task_struct *p)
|
|||
spin_unlock(&p->alloc_lock);
|
||||
}
|
||||
|
||||
extern struct sighand_struct *__lock_task_sighand(struct task_struct *tsk,
|
||||
unsigned long *flags);
|
||||
|
||||
static inline struct sighand_struct *lock_task_sighand(struct task_struct *tsk,
|
||||
unsigned long *flags)
|
||||
{
|
||||
struct sighand_struct *ret;
|
||||
|
||||
ret = __lock_task_sighand(tsk, flags);
|
||||
(void)__cond_lock(&tsk->sighand->siglock, ret);
|
||||
return ret;
|
||||
}
|
||||
|
||||
static inline void unlock_task_sighand(struct task_struct *tsk,
|
||||
unsigned long *flags)
|
||||
{
|
||||
spin_unlock_irqrestore(&tsk->sighand->siglock, *flags);
|
||||
}
|
||||
|
||||
#ifdef CONFIG_THREAD_INFO_IN_TASK
|
||||
|
||||
static inline struct thread_info *task_thread_info(struct task_struct *task)
|
||||
|
@ -2862,28 +2391,6 @@ static inline void mm_update_next_owner(struct mm_struct *mm)
|
|||
}
|
||||
#endif /* CONFIG_MEMCG */
|
||||
|
||||
static inline unsigned long task_rlimit(const struct task_struct *tsk,
|
||||
unsigned int limit)
|
||||
{
|
||||
return READ_ONCE(tsk->signal->rlim[limit].rlim_cur);
|
||||
}
|
||||
|
||||
static inline unsigned long task_rlimit_max(const struct task_struct *tsk,
|
||||
unsigned int limit)
|
||||
{
|
||||
return READ_ONCE(tsk->signal->rlim[limit].rlim_max);
|
||||
}
|
||||
|
||||
static inline unsigned long rlimit(unsigned int limit)
|
||||
{
|
||||
return task_rlimit(current, limit);
|
||||
}
|
||||
|
||||
static inline unsigned long rlimit_max(unsigned int limit)
|
||||
{
|
||||
return task_rlimit_max(current, limit);
|
||||
}
|
||||
|
||||
#define SCHED_CPUFREQ_RT (1U << 0)
|
||||
#define SCHED_CPUFREQ_DL (1U << 1)
|
||||
#define SCHED_CPUFREQ_IOWAIT (1U << 2)
|
||||
|
|
|
@ -8,4 +8,506 @@
|
|||
#include <linux/sched/jobctl.h>
|
||||
#include <linux/sched/task.h>
|
||||
|
||||
/*
|
||||
* Types defining task->signal and task->sighand and APIs using them:
|
||||
*/
|
||||
|
||||
struct sighand_struct {
|
||||
atomic_t count;
|
||||
struct k_sigaction action[_NSIG];
|
||||
spinlock_t siglock;
|
||||
wait_queue_head_t signalfd_wqh;
|
||||
};
|
||||
|
||||
/*
|
||||
* NOTE! "signal_struct" does not have its own
|
||||
* locking, because a shared signal_struct always
|
||||
* implies a shared sighand_struct, so locking
|
||||
* sighand_struct is always a proper superset of
|
||||
* the locking of signal_struct.
|
||||
*/
|
||||
struct signal_struct {
|
||||
atomic_t sigcnt;
|
||||
atomic_t live;
|
||||
int nr_threads;
|
||||
struct list_head thread_head;
|
||||
|
||||
wait_queue_head_t wait_chldexit; /* for wait4() */
|
||||
|
||||
/* current thread group signal load-balancing target: */
|
||||
struct task_struct *curr_target;
|
||||
|
||||
/* shared signal handling: */
|
||||
struct sigpending shared_pending;
|
||||
|
||||
/* thread group exit support */
|
||||
int group_exit_code;
|
||||
/* overloaded:
|
||||
* - notify group_exit_task when ->count is equal to notify_count
|
||||
* - everyone except group_exit_task is stopped during signal delivery
|
||||
* of fatal signals, group_exit_task processes the signal.
|
||||
*/
|
||||
int notify_count;
|
||||
struct task_struct *group_exit_task;
|
||||
|
||||
/* thread group stop support, overloads group_exit_code too */
|
||||
int group_stop_count;
|
||||
unsigned int flags; /* see SIGNAL_* flags below */
|
||||
|
||||
/*
|
||||
* PR_SET_CHILD_SUBREAPER marks a process, like a service
|
||||
* manager, to re-parent orphan (double-forking) child processes
|
||||
* to this process instead of 'init'. The service manager is
|
||||
* able to receive SIGCHLD signals and is able to investigate
|
||||
* the process until it calls wait(). All children of this
|
||||
* process will inherit a flag if they should look for a
|
||||
* child_subreaper process at exit.
|
||||
*/
|
||||
unsigned int is_child_subreaper:1;
|
||||
unsigned int has_child_subreaper:1;
|
||||
|
||||
#ifdef CONFIG_POSIX_TIMERS
|
||||
|
||||
/* POSIX.1b Interval Timers */
|
||||
int posix_timer_id;
|
||||
struct list_head posix_timers;
|
||||
|
||||
/* ITIMER_REAL timer for the process */
|
||||
struct hrtimer real_timer;
|
||||
ktime_t it_real_incr;
|
||||
|
||||
/*
|
||||
* ITIMER_PROF and ITIMER_VIRTUAL timers for the process, we use
|
||||
* CPUCLOCK_PROF and CPUCLOCK_VIRT for indexing array as these
|
||||
* values are defined to 0 and 1 respectively
|
||||
*/
|
||||
struct cpu_itimer it[2];
|
||||
|
||||
/*
|
||||
* Thread group totals for process CPU timers.
|
||||
* See thread_group_cputimer(), et al, for details.
|
||||
*/
|
||||
struct thread_group_cputimer cputimer;
|
||||
|
||||
/* Earliest-expiration cache. */
|
||||
struct task_cputime cputime_expires;
|
||||
|
||||
struct list_head cpu_timers[3];
|
||||
|
||||
#endif
|
||||
|
||||
struct pid *leader_pid;
|
||||
|
||||
#ifdef CONFIG_NO_HZ_FULL
|
||||
atomic_t tick_dep_mask;
|
||||
#endif
|
||||
|
||||
struct pid *tty_old_pgrp;
|
||||
|
||||
/* boolean value for session group leader */
|
||||
int leader;
|
||||
|
||||
struct tty_struct *tty; /* NULL if no tty */
|
||||
|
||||
#ifdef CONFIG_SCHED_AUTOGROUP
|
||||
struct autogroup *autogroup;
|
||||
#endif
|
||||
/*
|
||||
* Cumulative resource counters for dead threads in the group,
|
||||
* and for reaped dead child processes forked by this group.
|
||||
* Live threads maintain their own counters and add to these
|
||||
* in __exit_signal, except for the group leader.
|
||||
*/
|
||||
seqlock_t stats_lock;
|
||||
u64 utime, stime, cutime, cstime;
|
||||
u64 gtime;
|
||||
u64 cgtime;
|
||||
struct prev_cputime prev_cputime;
|
||||
unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw;
|
||||
unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt;
|
||||
unsigned long inblock, oublock, cinblock, coublock;
|
||||
unsigned long maxrss, cmaxrss;
|
||||
struct task_io_accounting ioac;
|
||||
|
||||
/*
|
||||
* Cumulative ns of schedule CPU time fo dead threads in the
|
||||
* group, not including a zombie group leader, (This only differs
|
||||
* from jiffies_to_ns(utime + stime) if sched_clock uses something
|
||||
* other than jiffies.)
|
||||
*/
|
||||
unsigned long long sum_sched_runtime;
|
||||
|
||||
/*
|
||||
* We don't bother to synchronize most readers of this at all,
|
||||
* because there is no reader checking a limit that actually needs
|
||||
* to get both rlim_cur and rlim_max atomically, and either one
|
||||
* alone is a single word that can safely be read normally.
|
||||
* getrlimit/setrlimit use task_lock(current->group_leader) to
|
||||
* protect this instead of the siglock, because they really
|
||||
* have no need to disable irqs.
|
||||
*/
|
||||
struct rlimit rlim[RLIM_NLIMITS];
|
||||
|
||||
#ifdef CONFIG_BSD_PROCESS_ACCT
|
||||
struct pacct_struct pacct; /* per-process accounting information */
|
||||
#endif
|
||||
#ifdef CONFIG_TASKSTATS
|
||||
struct taskstats *stats;
|
||||
#endif
|
||||
#ifdef CONFIG_AUDIT
|
||||
unsigned audit_tty;
|
||||
struct tty_audit_buf *tty_audit_buf;
|
||||
#endif
|
||||
|
||||
/*
|
||||
* Thread is the potential origin of an oom condition; kill first on
|
||||
* oom
|
||||
*/
|
||||
bool oom_flag_origin;
|
||||
short oom_score_adj; /* OOM kill score adjustment */
|
||||
short oom_score_adj_min; /* OOM kill score adjustment min value.
|
||||
* Only settable by CAP_SYS_RESOURCE. */
|
||||
struct mm_struct *oom_mm; /* recorded mm when the thread group got
|
||||
* killed by the oom killer */
|
||||
|
||||
struct mutex cred_guard_mutex; /* guard against foreign influences on
|
||||
* credential calculations
|
||||
* (notably. ptrace) */
|
||||
};
|
||||
|
||||
/*
|
||||
* Bits in flags field of signal_struct.
|
||||
*/
|
||||
#define SIGNAL_STOP_STOPPED 0x00000001 /* job control stop in effect */
|
||||
#define SIGNAL_STOP_CONTINUED 0x00000002 /* SIGCONT since WCONTINUED reap */
|
||||
#define SIGNAL_GROUP_EXIT 0x00000004 /* group exit in progress */
|
||||
#define SIGNAL_GROUP_COREDUMP 0x00000008 /* coredump in progress */
|
||||
/*
|
||||
* Pending notifications to parent.
|
||||
*/
|
||||
#define SIGNAL_CLD_STOPPED 0x00000010
|
||||
#define SIGNAL_CLD_CONTINUED 0x00000020
|
||||
#define SIGNAL_CLD_MASK (SIGNAL_CLD_STOPPED|SIGNAL_CLD_CONTINUED)
|
||||
|
||||
#define SIGNAL_UNKILLABLE 0x00000040 /* for init: ignore fatal signals */
|
||||
|
||||
#define SIGNAL_STOP_MASK (SIGNAL_CLD_MASK | SIGNAL_STOP_STOPPED | \
|
||||
SIGNAL_STOP_CONTINUED)
|
||||
|
||||
static inline void signal_set_stop_flags(struct signal_struct *sig,
|
||||
unsigned int flags)
|
||||
{
|
||||
WARN_ON(sig->flags & (SIGNAL_GROUP_EXIT|SIGNAL_GROUP_COREDUMP));
|
||||
sig->flags = (sig->flags & ~SIGNAL_STOP_MASK) | flags;
|
||||
}
|
||||
|
||||
/* If true, all threads except ->group_exit_task have pending SIGKILL */
|
||||
static inline int signal_group_exit(const struct signal_struct *sig)
|
||||
{
|
||||
return (sig->flags & SIGNAL_GROUP_EXIT) ||
|
||||
(sig->group_exit_task != NULL);
|
||||
}
|
||||
|
||||
extern void flush_signals(struct task_struct *);
|
||||
extern void ignore_signals(struct task_struct *);
|
||||
extern void flush_signal_handlers(struct task_struct *, int force_default);
|
||||
extern int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info);
|
||||
|
||||
static inline int kernel_dequeue_signal(siginfo_t *info)
|
||||
{
|
||||
struct task_struct *tsk = current;
|
||||
siginfo_t __info;
|
||||
int ret;
|
||||
|
||||
spin_lock_irq(&tsk->sighand->siglock);
|
||||
ret = dequeue_signal(tsk, &tsk->blocked, info ?: &__info);
|
||||
spin_unlock_irq(&tsk->sighand->siglock);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static inline void kernel_signal_stop(void)
|
||||
{
|
||||
spin_lock_irq(¤t->sighand->siglock);
|
||||
if (current->jobctl & JOBCTL_STOP_DEQUEUED)
|
||||
__set_current_state(TASK_STOPPED);
|
||||
spin_unlock_irq(¤t->sighand->siglock);
|
||||
|
||||
schedule();
|
||||
}
|
||||
extern int send_sig_info(int, struct siginfo *, struct task_struct *);
|
||||
extern int force_sigsegv(int, struct task_struct *);
|
||||
extern int force_sig_info(int, struct siginfo *, struct task_struct *);
|
||||
extern int __kill_pgrp_info(int sig, struct siginfo *info, struct pid *pgrp);
|
||||
extern int kill_pid_info(int sig, struct siginfo *info, struct pid *pid);
|
||||
extern int kill_pid_info_as_cred(int, struct siginfo *, struct pid *,
|
||||
const struct cred *, u32);
|
||||
extern int kill_pgrp(struct pid *pid, int sig, int priv);
|
||||
extern int kill_pid(struct pid *pid, int sig, int priv);
|
||||
extern int kill_proc_info(int, struct siginfo *, pid_t);
|
||||
extern __must_check bool do_notify_parent(struct task_struct *, int);
|
||||
extern void __wake_up_parent(struct task_struct *p, struct task_struct *parent);
|
||||
extern void force_sig(int, struct task_struct *);
|
||||
extern int send_sig(int, struct task_struct *, int);
|
||||
extern int zap_other_threads(struct task_struct *p);
|
||||
extern struct sigqueue *sigqueue_alloc(void);
|
||||
extern void sigqueue_free(struct sigqueue *);
|
||||
extern int send_sigqueue(struct sigqueue *, struct task_struct *, int group);
|
||||
extern int do_sigaction(int, struct k_sigaction *, struct k_sigaction *);
|
||||
|
||||
#ifdef TIF_RESTORE_SIGMASK
|
||||
/*
|
||||
* Legacy restore_sigmask accessors. These are inefficient on
|
||||
* SMP architectures because they require atomic operations.
|
||||
*/
|
||||
|
||||
/**
|
||||
* set_restore_sigmask() - make sure saved_sigmask processing gets done
|
||||
*
|
||||
* This sets TIF_RESTORE_SIGMASK and ensures that the arch signal code
|
||||
* will run before returning to user mode, to process the flag. For
|
||||
* all callers, TIF_SIGPENDING is already set or it's no harm to set
|
||||
* it. TIF_RESTORE_SIGMASK need not be in the set of bits that the
|
||||
* arch code will notice on return to user mode, in case those bits
|
||||
* are scarce. We set TIF_SIGPENDING here to ensure that the arch
|
||||
* signal code always gets run when TIF_RESTORE_SIGMASK is set.
|
||||
*/
|
||||
static inline void set_restore_sigmask(void)
|
||||
{
|
||||
set_thread_flag(TIF_RESTORE_SIGMASK);
|
||||
WARN_ON(!test_thread_flag(TIF_SIGPENDING));
|
||||
}
|
||||
static inline void clear_restore_sigmask(void)
|
||||
{
|
||||
clear_thread_flag(TIF_RESTORE_SIGMASK);
|
||||
}
|
||||
static inline bool test_restore_sigmask(void)
|
||||
{
|
||||
return test_thread_flag(TIF_RESTORE_SIGMASK);
|
||||
}
|
||||
static inline bool test_and_clear_restore_sigmask(void)
|
||||
{
|
||||
return test_and_clear_thread_flag(TIF_RESTORE_SIGMASK);
|
||||
}
|
||||
|
||||
#else /* TIF_RESTORE_SIGMASK */
|
||||
|
||||
/* Higher-quality implementation, used if TIF_RESTORE_SIGMASK doesn't exist. */
|
||||
static inline void set_restore_sigmask(void)
|
||||
{
|
||||
current->restore_sigmask = true;
|
||||
WARN_ON(!test_thread_flag(TIF_SIGPENDING));
|
||||
}
|
||||
static inline void clear_restore_sigmask(void)
|
||||
{
|
||||
current->restore_sigmask = false;
|
||||
}
|
||||
static inline bool test_restore_sigmask(void)
|
||||
{
|
||||
return current->restore_sigmask;
|
||||
}
|
||||
static inline bool test_and_clear_restore_sigmask(void)
|
||||
{
|
||||
if (!current->restore_sigmask)
|
||||
return false;
|
||||
current->restore_sigmask = false;
|
||||
return true;
|
||||
}
|
||||
#endif
|
||||
|
||||
static inline void restore_saved_sigmask(void)
|
||||
{
|
||||
if (test_and_clear_restore_sigmask())
|
||||
__set_current_blocked(¤t->saved_sigmask);
|
||||
}
|
||||
|
||||
static inline sigset_t *sigmask_to_save(void)
|
||||
{
|
||||
sigset_t *res = ¤t->blocked;
|
||||
if (unlikely(test_restore_sigmask()))
|
||||
res = ¤t->saved_sigmask;
|
||||
return res;
|
||||
}
|
||||
|
||||
static inline int kill_cad_pid(int sig, int priv)
|
||||
{
|
||||
return kill_pid(cad_pid, sig, priv);
|
||||
}
|
||||
|
||||
/* These can be the second arg to send_sig_info/send_group_sig_info. */
|
||||
#define SEND_SIG_NOINFO ((struct siginfo *) 0)
|
||||
#define SEND_SIG_PRIV ((struct siginfo *) 1)
|
||||
#define SEND_SIG_FORCED ((struct siginfo *) 2)
|
||||
|
||||
/*
|
||||
* True if we are on the alternate signal stack.
|
||||
*/
|
||||
static inline int on_sig_stack(unsigned long sp)
|
||||
{
|
||||
/*
|
||||
* If the signal stack is SS_AUTODISARM then, by construction, we
|
||||
* can't be on the signal stack unless user code deliberately set
|
||||
* SS_AUTODISARM when we were already on it.
|
||||
*
|
||||
* This improves reliability: if user state gets corrupted such that
|
||||
* the stack pointer points very close to the end of the signal stack,
|
||||
* then this check will enable the signal to be handled anyway.
|
||||
*/
|
||||
if (current->sas_ss_flags & SS_AUTODISARM)
|
||||
return 0;
|
||||
|
||||
#ifdef CONFIG_STACK_GROWSUP
|
||||
return sp >= current->sas_ss_sp &&
|
||||
sp - current->sas_ss_sp < current->sas_ss_size;
|
||||
#else
|
||||
return sp > current->sas_ss_sp &&
|
||||
sp - current->sas_ss_sp <= current->sas_ss_size;
|
||||
#endif
|
||||
}
|
||||
|
||||
static inline int sas_ss_flags(unsigned long sp)
|
||||
{
|
||||
if (!current->sas_ss_size)
|
||||
return SS_DISABLE;
|
||||
|
||||
return on_sig_stack(sp) ? SS_ONSTACK : 0;
|
||||
}
|
||||
|
||||
static inline void sas_ss_reset(struct task_struct *p)
|
||||
{
|
||||
p->sas_ss_sp = 0;
|
||||
p->sas_ss_size = 0;
|
||||
p->sas_ss_flags = SS_DISABLE;
|
||||
}
|
||||
|
||||
static inline unsigned long sigsp(unsigned long sp, struct ksignal *ksig)
|
||||
{
|
||||
if (unlikely((ksig->ka.sa.sa_flags & SA_ONSTACK)) && ! sas_ss_flags(sp))
|
||||
#ifdef CONFIG_STACK_GROWSUP
|
||||
return current->sas_ss_sp;
|
||||
#else
|
||||
return current->sas_ss_sp + current->sas_ss_size;
|
||||
#endif
|
||||
return sp;
|
||||
}
|
||||
|
||||
extern void __cleanup_sighand(struct sighand_struct *);
|
||||
extern void flush_itimer_signals(void);
|
||||
|
||||
#define tasklist_empty() \
|
||||
list_empty(&init_task.tasks)
|
||||
|
||||
#define next_task(p) \
|
||||
list_entry_rcu((p)->tasks.next, struct task_struct, tasks)
|
||||
|
||||
#define for_each_process(p) \
|
||||
for (p = &init_task ; (p = next_task(p)) != &init_task ; )
|
||||
|
||||
extern bool current_is_single_threaded(void);
|
||||
|
||||
/*
|
||||
* Careful: do_each_thread/while_each_thread is a double loop so
|
||||
* 'break' will not work as expected - use goto instead.
|
||||
*/
|
||||
#define do_each_thread(g, t) \
|
||||
for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do
|
||||
|
||||
#define while_each_thread(g, t) \
|
||||
while ((t = next_thread(t)) != g)
|
||||
|
||||
#define __for_each_thread(signal, t) \
|
||||
list_for_each_entry_rcu(t, &(signal)->thread_head, thread_node)
|
||||
|
||||
#define for_each_thread(p, t) \
|
||||
__for_each_thread((p)->signal, t)
|
||||
|
||||
/* Careful: this is a double loop, 'break' won't work as expected. */
|
||||
#define for_each_process_thread(p, t) \
|
||||
for_each_process(p) for_each_thread(p, t)
|
||||
|
||||
typedef int (*proc_visitor)(struct task_struct *p, void *data);
|
||||
void walk_process_tree(struct task_struct *top, proc_visitor, void *);
|
||||
|
||||
static inline int get_nr_threads(struct task_struct *tsk)
|
||||
{
|
||||
return tsk->signal->nr_threads;
|
||||
}
|
||||
|
||||
static inline bool thread_group_leader(struct task_struct *p)
|
||||
{
|
||||
return p->exit_signal >= 0;
|
||||
}
|
||||
|
||||
/* Do to the insanities of de_thread it is possible for a process
|
||||
* to have the pid of the thread group leader without actually being
|
||||
* the thread group leader. For iteration through the pids in proc
|
||||
* all we care about is that we have a task with the appropriate
|
||||
* pid, we don't actually care if we have the right task.
|
||||
*/
|
||||
static inline bool has_group_leader_pid(struct task_struct *p)
|
||||
{
|
||||
return task_pid(p) == p->signal->leader_pid;
|
||||
}
|
||||
|
||||
static inline
|
||||
bool same_thread_group(struct task_struct *p1, struct task_struct *p2)
|
||||
{
|
||||
return p1->signal == p2->signal;
|
||||
}
|
||||
|
||||
static inline struct task_struct *next_thread(const struct task_struct *p)
|
||||
{
|
||||
return list_entry_rcu(p->thread_group.next,
|
||||
struct task_struct, thread_group);
|
||||
}
|
||||
|
||||
static inline int thread_group_empty(struct task_struct *p)
|
||||
{
|
||||
return list_empty(&p->thread_group);
|
||||
}
|
||||
|
||||
#define delay_group_leader(p) \
|
||||
(thread_group_leader(p) && !thread_group_empty(p))
|
||||
|
||||
extern struct sighand_struct *__lock_task_sighand(struct task_struct *tsk,
|
||||
unsigned long *flags);
|
||||
|
||||
static inline struct sighand_struct *lock_task_sighand(struct task_struct *tsk,
|
||||
unsigned long *flags)
|
||||
{
|
||||
struct sighand_struct *ret;
|
||||
|
||||
ret = __lock_task_sighand(tsk, flags);
|
||||
(void)__cond_lock(&tsk->sighand->siglock, ret);
|
||||
return ret;
|
||||
}
|
||||
|
||||
static inline void unlock_task_sighand(struct task_struct *tsk,
|
||||
unsigned long *flags)
|
||||
{
|
||||
spin_unlock_irqrestore(&tsk->sighand->siglock, *flags);
|
||||
}
|
||||
|
||||
static inline unsigned long task_rlimit(const struct task_struct *tsk,
|
||||
unsigned int limit)
|
||||
{
|
||||
return READ_ONCE(tsk->signal->rlim[limit].rlim_cur);
|
||||
}
|
||||
|
||||
static inline unsigned long task_rlimit_max(const struct task_struct *tsk,
|
||||
unsigned int limit)
|
||||
{
|
||||
return READ_ONCE(tsk->signal->rlim[limit].rlim_max);
|
||||
}
|
||||
|
||||
static inline unsigned long rlimit(unsigned int limit)
|
||||
{
|
||||
return task_rlimit(current, limit);
|
||||
}
|
||||
|
||||
static inline unsigned long rlimit_max(unsigned int limit)
|
||||
{
|
||||
return task_rlimit_max(current, limit);
|
||||
}
|
||||
|
||||
#endif /* _LINUX_SCHED_SIGNAL_H */
|
||||
|
|
|
@ -5,6 +5,7 @@
|
|||
#include <linux/sort.h>
|
||||
#include <linux/delay.h>
|
||||
#include <linux/mm.h>
|
||||
#include <linux/sched/signal.h>
|
||||
#include <linux/slab.h>
|
||||
#include <linux/vmalloc.h>
|
||||
#include <linux/delayacct.h>
|
||||
|
|
|
@ -12,7 +12,7 @@
|
|||
#include <linux/mm.h>
|
||||
#include <linux/module.h>
|
||||
#include <linux/highmem.h>
|
||||
#include <linux/sched.h>
|
||||
#include <linux/sched/signal.h>
|
||||
#include <linux/slab.h>
|
||||
#include <linux/spinlock.h>
|
||||
#include <linux/interrupt.h>
|
||||
|
|
|
@ -27,6 +27,8 @@
|
|||
#include <linux/inetdevice.h>
|
||||
#include <linux/workqueue.h>
|
||||
#include <linux/in.h>
|
||||
#include <linux/sched/signal.h>
|
||||
|
||||
#include <net/sock.h>
|
||||
#include <net/tcp.h>
|
||||
#include <net/smc.h>
|
||||
|
|
|
@ -11,6 +11,8 @@
|
|||
|
||||
#include <linux/in.h>
|
||||
#include <linux/if_ether.h>
|
||||
#include <linux/sched/signal.h>
|
||||
|
||||
#include <net/sock.h>
|
||||
#include <net/tcp.h>
|
||||
|
||||
|
|
|
@ -9,6 +9,8 @@
|
|||
*/
|
||||
|
||||
#include <linux/workqueue.h>
|
||||
#include <linux/sched/signal.h>
|
||||
|
||||
#include <net/sock.h>
|
||||
|
||||
#include "smc.h"
|
||||
|
|
|
@ -11,6 +11,8 @@
|
|||
|
||||
#include <linux/net.h>
|
||||
#include <linux/rcupdate.h>
|
||||
#include <linux/sched/signal.h>
|
||||
|
||||
#include <net/sock.h>
|
||||
|
||||
#include "smc.h"
|
||||
|
|
|
@ -15,6 +15,8 @@
|
|||
#include <linux/net.h>
|
||||
#include <linux/rcupdate.h>
|
||||
#include <linux/workqueue.h>
|
||||
#include <linux/sched/signal.h>
|
||||
|
||||
#include <net/sock.h>
|
||||
|
||||
#include "smc.h"
|
||||
|
|
Загрузка…
Ссылка в новой задаче