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task_work: teach task_work_add() to do signal_wake_up()

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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>
This commit is contained in:
Oleg Nesterov 2020-06-30 17:32:54 +02:00 • committed by Jens Axboe
parent d60b5fbc1c
commit e91b481623
4 changed files with 28 additions and 7 deletions
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5
include/linux/task_work.h
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@ -13,7 +13,10 @@ init_task_work(struct callback_head *twork, task_work_func_t func)
twork->func = func;
}
int task_work_add(struct task_struct *task, struct callback_head *twork, bool);
#define TWA_RESUME 1
#define TWA_SIGNAL 2
int task_work_add(struct task_struct *task, struct callback_head *twork, int);
struct callback_head *task_work_cancel(struct task_struct *, task_work_func_t);
void task_work_run(void);