The following commit has been merged into the timers/core branch of tip:

Commit-ID:     ef1c5bcd6daa674392bdf89b8ae889aafd73f956
Gitweb:        https://git.kernel.org/tip/ef1c5bcd6daa674392bdf89b8ae889aafd73f956
Author:        Thomas Gleixner <tglx@linutronix.de>
AuthorDate:    Tue, 05 Nov 2024 09:14:41 +01:00
Committer:     Thomas Gleixner <tglx@linutronix.de>
CommitterDate: Thu, 07 Nov 2024 02:14:44 +01:00

posix-timers: Store PID type in the timer

instead of re-evaluating the signal delivery mode everywhere.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Frederic Weisbecker <frederic@kernel.org>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/all/20241105064213.519086500@linutronix.de

---
 include/linux/posix-timers.h |  2 ++
 kernel/time/posix-timers.c   |  9 ++++++---
 2 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/include/linux/posix-timers.h b/include/linux/posix-timers.h
index 200098d..9471765 100644
--- a/include/linux/posix-timers.h
+++ b/include/linux/posix-timers.h
@@ -5,6 +5,7 @@
 #include <linux/alarmtimer.h>
 #include <linux/list.h>
 #include <linux/mutex.h>
+#include <linux/pid.h>
 #include <linux/posix-timers_types.h>
 #include <linux/rcuref.h>
 #include <linux/spinlock.h>
@@ -180,6 +181,7 @@ struct k_itimer {
 	s64			it_overrun_last;
 	unsigned int		it_signal_seq;
 	int			it_sigev_notify;
+	enum pid_type		it_pid_type;
 	ktime_t			it_interval;
 	struct signal_struct	*it_signal;
 	union {
diff --git a/kernel/time/posix-timers.c b/kernel/time/posix-timers.c
index 53bd3c4..f18d64c 100644
--- a/kernel/time/posix-timers.c
+++ b/kernel/time/posix-timers.c
@@ -298,7 +298,6 @@ out:
 int posix_timer_queue_signal(struct k_itimer *timr)
 {
 	enum posix_timer_state state = POSIX_TIMER_DISARMED;
-	enum pid_type type;
 	int ret;
 
 	lockdep_assert_held(&timr->it_lock);
@@ -308,8 +307,7 @@ int posix_timer_queue_signal(struct k_itimer *timr)
 
 	timr->it_status = state;
 
-	type = !(timr->it_sigev_notify & SIGEV_THREAD_ID) ? PIDTYPE_TGID : PIDTYPE_PID;
-	ret = send_sigqueue(timr->sigq, timr->it_pid, type, timr->it_signal_seq);
+	ret = send_sigqueue(timr->sigq, timr->it_pid, timr->it_pid_type, timr->it_signal_seq);
 	/* If we failed to send the signal the timer stops. */
 	return ret > 0;
 }
@@ -496,6 +494,11 @@ static int do_timer_create(clockid_t which_clock, struct sigevent *event,
 		new_timer->it_pid = get_pid(task_tgid(current));
 	}
 
+	if (new_timer->it_sigev_notify & SIGEV_THREAD_ID)
+		new_timer->it_pid_type = PIDTYPE_PID;
+	else
+		new_timer->it_pid_type = PIDTYPE_TGID;
+
 	new_timer->sigq->info.si_tid   = new_timer->it_id;
 	new_timer->sigq->info.si_code  = SI_TIMER;