ich777/linux_media
1
0
Fork 0
mirror of https://github.com/tbsdtv/linux_media.git synced 2025-07-23 20:51:03 +02:00
Code Issues Packages Projects Releases Wiki Activity

Merge tag 'core-entry-notify-signal' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip into tif-task_work.arch

Browse Source 
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
This commit is contained in:
Jens Axboe
2020-11-09 07:19:32 -07:00
parent f8394f232b 114518eb64
commit 29701d69b9
10 changed files with 118 additions and 30 deletions
Download Patch File Download Diff File Expand all files Collapse all files

27
include/linux/tracehook.h
View File

@@ -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> */