Commit 451898ea authored by Thomas Gleixner's avatar Thomas Gleixner
Browse files

posix-timers: Make per process list RCU safe 



Preparatory change to remove the sighand locking from the /proc/$PID/timers
iterator.

Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
Reviewed-by: default avatarFrederic Weisbecker <frederic@kernel.org>
Link: https://lore.kernel.org/all/20250308155624.403223080@linutronix.de
parent 5fa75a43

kernel/time/posix-timers.c

+2 −2
Original line number Diff line number Diff line
@@ -518,7 +518,7 @@ static int do_timer_create(clockid_t which_clock, struct sigevent *event, 
		 * Store the unmodified signal pointer to make it valid.

		 */

		WRITE_ONCE(new_timer->it_signal, current->signal);

		hlist_add_head(&new_timer->list, &current->signal->posix_timers);

		hlist_add_head_rcu(&new_timer->list, &current->signal->posix_timers);

	}

	/*

	 * After unlocking @new_timer is subject to concurrent removal and
@@ -1004,7 +1004,7 @@ static void posix_timer_delete(struct k_itimer *timer) 
		unsigned long sig = (unsigned long)timer->it_signal | 1UL;



		WRITE_ONCE(timer->it_signal, (struct signal_struct *)sig);

		hlist_del(&timer->list);

		hlist_del_rcu(&timer->list);

		posix_timer_cleanup_ignored(timer);

	}