e91b481623
So that the target task will exit the wait_event_interruptible-like loop and call task_work_run() asap. The patch turns "bool notify" into 0,TWA_RESUME,TWA_SIGNAL enum, the new TWA_SIGNAL flag implies signal_wake_up(). However, it needs to avoid the race with recalc_sigpending(), so the patch also adds the new JOBCTL_TASK_WORK bit included in JOBCTL_PENDING_MASK. TODO: once this patch is merged we need to change all current users of task_work_add(notify = true) to use TWA_RESUME. Cc: stable@vger.kernel.org # v5.7 Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Oleg Nesterov <oleg@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
42 lines
1.7 KiB
C
42 lines
1.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_SCHED_JOBCTL_H
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#define _LINUX_SCHED_JOBCTL_H
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#include <linux/types.h>
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struct task_struct;
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/*
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* task->jobctl flags
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*/
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#define JOBCTL_STOP_SIGMASK 0xffff /* signr of the last group stop */
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#define JOBCTL_STOP_DEQUEUED_BIT 16 /* stop signal dequeued */
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#define JOBCTL_STOP_PENDING_BIT 17 /* task should stop for group stop */
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#define JOBCTL_STOP_CONSUME_BIT 18 /* consume group stop count */
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#define JOBCTL_TRAP_STOP_BIT 19 /* trap for STOP */
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#define JOBCTL_TRAP_NOTIFY_BIT 20 /* trap for NOTIFY */
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#define JOBCTL_TRAPPING_BIT 21 /* switching to TRACED */
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#define JOBCTL_LISTENING_BIT 22 /* ptracer is listening for events */
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#define JOBCTL_TRAP_FREEZE_BIT 23 /* trap for cgroup freezer */
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#define JOBCTL_TASK_WORK_BIT 24 /* set by TWA_SIGNAL */
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#define JOBCTL_STOP_DEQUEUED (1UL << JOBCTL_STOP_DEQUEUED_BIT)
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#define JOBCTL_STOP_PENDING (1UL << JOBCTL_STOP_PENDING_BIT)
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#define JOBCTL_STOP_CONSUME (1UL << JOBCTL_STOP_CONSUME_BIT)
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#define JOBCTL_TRAP_STOP (1UL << JOBCTL_TRAP_STOP_BIT)
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#define JOBCTL_TRAP_NOTIFY (1UL << JOBCTL_TRAP_NOTIFY_BIT)
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#define JOBCTL_TRAPPING (1UL << JOBCTL_TRAPPING_BIT)
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#define JOBCTL_LISTENING (1UL << JOBCTL_LISTENING_BIT)
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#define JOBCTL_TRAP_FREEZE (1UL << JOBCTL_TRAP_FREEZE_BIT)
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#define JOBCTL_TASK_WORK (1UL << JOBCTL_TASK_WORK_BIT)
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#define JOBCTL_TRAP_MASK (JOBCTL_TRAP_STOP | JOBCTL_TRAP_NOTIFY)
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#define JOBCTL_PENDING_MASK (JOBCTL_STOP_PENDING | JOBCTL_TRAP_MASK | JOBCTL_TASK_WORK)
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extern bool task_set_jobctl_pending(struct task_struct *task, unsigned long mask);
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extern void task_clear_jobctl_trapping(struct task_struct *task);
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extern void task_clear_jobctl_pending(struct task_struct *task, unsigned long mask);
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#endif /* _LINUX_SCHED_JOBCTL_H */
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