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| author | Jens Axboe <axboe@kernel.dk> | 2020-11-09 07:19:32 -0700 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2020-11-09 07:19:32 -0700 |
| commit | 29701d69b98d0a132abd63fe2e51125f478fbc53 (patch) | |
| tree | 0650d3905c76124eb8c29d17c8434b5bb8954fe2 /include/linux/tracehook.h | |
| parent | f8394f232b1eab649ce2df5c5f15b0e528c92091 (diff) | |
| parent | 114518eb6430b832d2f9f5a008043b913ccf0e24 (diff) | |
Merge tag 'core-entry-notify-signal' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip into tif-task_work.arch
Core changes to support TASK_NOTIFY_SIGNAL
* tag 'core-entry-notify-signal' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
task_work: Use TIF_NOTIFY_SIGNAL if available
entry: Add support for TIF_NOTIFY_SIGNAL
signal: Add task_sigpending() helper
Diffstat (limited to 'include/linux/tracehook.h')
| -rw-r--r-- | include/linux/tracehook.h | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/include/linux/tracehook.h b/include/linux/tracehook.h index b480e1a07ed8..f7d82e4fafd6 100644 --- a/include/linux/tracehook.h +++ b/include/linux/tracehook.h @@ -198,4 +198,31 @@ static inline void tracehook_notify_resume(struct pt_regs *regs) blkcg_maybe_throttle_current(); } +/* + * called by exit_to_user_mode_loop() if ti_work & _TIF_NOTIFY_SIGNAL. This + * is currently used by TWA_SIGNAL based task_work, which requires breaking + * wait loops to ensure that task_work is noticed and run. + */ +static inline void tracehook_notify_signal(void) +{ +#if defined(TIF_NOTIFY_SIGNAL) + clear_thread_flag(TIF_NOTIFY_SIGNAL); + smp_mb__after_atomic(); + if (current->task_works) + task_work_run(); +#endif +} + +/* + * Called when we have work to process from exit_to_user_mode_loop() + */ +static inline void set_notify_signal(struct task_struct *task) +{ +#if defined(TIF_NOTIFY_SIGNAL) + if (!test_and_set_tsk_thread_flag(task, TIF_NOTIFY_SIGNAL) && + !wake_up_state(task, TASK_INTERRUPTIBLE)) + kick_process(task); +#endif +} + #endif /* <linux/tracehook.h> */ |