From 593febb143d17aa2096cd123c9d62b6981eb1d97 Mon Sep 17 00:00:00 2001 From: "Eric W. Biederman" Date: Wed, 9 Feb 2022 11:46:54 -0600 Subject: signal: Move set_notify_signal and clear_notify_signal into sched/signal.h The header tracehook.h is no place for code to live. The functions set_notify_signal and clear_notify_signal are not about signals. They are about interruptions that act like signals. The fundamental signal primitives wind up calling set_notify_signal and clear_notify_signal. Which means they need to be maintained with the signal code. Since set_notify_signal and clear_notify_signal must be maintained with the signal subsystem move them into sched/signal.h and claim them as part of the signal subsystem. Reviewed-by: Kees Cook Link: https://lkml.kernel.org/r/20220309162454.123006-10-ebiederm@xmission.com Signed-off-by: "Eric W. Biederman" --- include/linux/sched/signal.h | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) (limited to 'include/linux/sched/signal.h') diff --git a/include/linux/sched/signal.h b/include/linux/sched/signal.h index b6ecb9fc4cd2..3c8b34876744 100644 --- a/include/linux/sched/signal.h +++ b/include/linux/sched/signal.h @@ -349,6 +349,23 @@ extern void sigqueue_free(struct sigqueue *); extern int send_sigqueue(struct sigqueue *, struct pid *, enum pid_type); extern int do_sigaction(int, struct k_sigaction *, struct k_sigaction *); +static inline void clear_notify_signal(void) +{ + clear_thread_flag(TIF_NOTIFY_SIGNAL); + smp_mb__after_atomic(); +} + +/* + * Called to break out of interruptible wait loops, and enter the + * exit_to_user_mode_loop(). + */ +static inline void set_notify_signal(struct task_struct *task) +{ + if (!test_and_set_tsk_thread_flag(task, TIF_NOTIFY_SIGNAL) && + !wake_up_state(task, TASK_INTERRUPTIBLE)) + kick_process(task); +} + static inline int restart_syscall(void) { set_tsk_thread_flag(current, TIF_SIGPENDING); -- cgit