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signal: kill JOBCTL_TASK_WORK 

It's no longer used, get rid of it.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2020-10-09 16:03:01 -06:00
parent 792ee0f6db
commit 98b89b649f
2 changed files with 1 additions and 23 deletions
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4
include/linux/sched/jobctl.h
View File

@ -19,7 +19,6 @@ struct task_struct;
#define JOBCTL_TRAPPING_BIT 21 /* switching to TRACED */
#define JOBCTL_LISTENING_BIT 22 /* ptracer is listening for events */
#define JOBCTL_TRAP_FREEZE_BIT 23 /* trap for cgroup freezer */
#define JOBCTL_TASK_WORK_BIT 24 /* set by TWA_SIGNAL */
#define JOBCTL_STOP_DEQUEUED (1UL << JOBCTL_STOP_DEQUEUED_BIT)
#define JOBCTL_STOP_PENDING (1UL << JOBCTL_STOP_PENDING_BIT)
@ -29,10 +28,9 @@ struct task_struct;
#define JOBCTL_TRAPPING (1UL << JOBCTL_TRAPPING_BIT)
#define JOBCTL_LISTENING (1UL << JOBCTL_LISTENING_BIT)
#define JOBCTL_TRAP_FREEZE (1UL << JOBCTL_TRAP_FREEZE_BIT)
#define JOBCTL_TASK_WORK (1UL << JOBCTL_TASK_WORK_BIT)
#define JOBCTL_TRAP_MASK (JOBCTL_TRAP_STOP | JOBCTL_TRAP_NOTIFY)
#define JOBCTL_PENDING_MASK (JOBCTL_STOP_PENDING | JOBCTL_TRAP_MASK | JOBCTL_TASK_WORK)
#define JOBCTL_PENDING_MASK (JOBCTL_STOP_PENDING | JOBCTL_TRAP_MASK)
extern bool task_set_jobctl_pending(struct task_struct *task, unsigned long mask);
extern void task_clear_jobctl_trapping(struct task_struct *task);

20
kernel/signal.c
View File

@ -2556,26 +2556,6 @@ bool get_signal(struct ksignal *ksig)
relock:
spin_lock_irq(&sighand->siglock);
/*
* Make sure we can safely read ->jobctl() in task_work add. As Oleg
* states:
*
* It pairs with mb (implied by cmpxchg) before READ_ONCE. So we
* roughly have
*
* task_work_add: get_signal:
* STORE(task->task_works, new_work); STORE(task->jobctl);
* mb(); mb();
* LOAD(task->jobctl); LOAD(task->task_works);
*
* and we can rely on STORE-MB-LOAD [ in task_work_add].
*/
smp_store_mb(current->jobctl, current->jobctl & ~JOBCTL_TASK_WORK);
if (unlikely(current->task_works)) {
spin_unlock_irq(&sighand->siglock);
task_work_run();
goto relock;
}
/*
* Every stopped thread goes here after wakeup. Check to see if