Messages in this thread Patch in this message | | | Date | Thu, 11 Mar 2021 14:20:37 +0100 | From | Thomas Gleixner <> | Subject | [patch V2 1/3] signal: Provide and use exit_task_sighand() |
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To prepare for caching a sigqueue per task, implement a dedicated function to flush the sigqueue of the exiting task.
No functional change.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de> --- include/linux/signal.h | 1 + kernel/exit.c | 3 +-- kernel/signal.c | 9 +++++++++ 3 files changed, 11 insertions(+), 2 deletions(-)
--- a/include/linux/signal.h +++ b/include/linux/signal.h @@ -265,6 +265,7 @@ static inline void init_sigpending(struc } extern void flush_sigqueue(struct sigpending *queue); +extern void exit_task_sighand(struct task_struct *tsk); /* Test if 'sig' is valid signal. Use this instead of testing _NSIG directly */ static inline int valid_signal(unsigned long sig) --- a/kernel/exit.c +++ b/kernel/exit.c @@ -152,8 +152,7 @@ static void __exit_signal(struct task_st * Do this under ->siglock, we can race with another thread * doing sigqueue_free() if we have SIGQUEUE_PREALLOC signals. */ - flush_sigqueue(&tsk->pending); - tsk->sighand = NULL; + exit_task_sighand(tsk); spin_unlock(&sighand->siglock); __cleanup_sighand(sighand); --- a/kernel/signal.c +++ b/kernel/signal.c @@ -471,6 +471,15 @@ void flush_sigqueue(struct sigpending *q } /* + * Called from __exit_signal. Flush tsk->pending and clear tsk->sighand. + */ +void exit_task_sighand(struct task_struct *tsk) +{ + flush_sigqueue(&tsk->pending); + tsk->sighand = NULL; +} + +/* * Flush all pending signals for this kthread. */ void flush_signals(struct task_struct *t)
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