linux-kernel - [patch 08/11] posix-timers: Make per process list RCU safe

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Message-ID: <20250224101343.476200215@linutronix.de>
Date: Mon, 24 Feb 2025 11:15:35 +0100 (CET)
From: Thomas Gleixner <tglx@...utronix.de>
To: LKML <linux-kernel@...r.kernel.org>
Cc: Anna-Maria Behnsen <anna-maria@...utronix.de>,
 Frederic Weisbecker <frederic@...nel.org>,
 Benjamin Segall <bsegall@...gle.com>,
 Eric Dumazet <edumazet@...gle.com>,
 Andrey Vagin <avagin@...nvz.org>,
 Pavel Tikhomirov <ptikhomirov@...tuozzo.com>,
 Peter Zijlstra <peterz@...radead.org>
Subject: [patch 08/11] posix-timers: Make per process list RCU safe

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

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
---
 kernel/time/posix-timers.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/kernel/time/posix-timers.c
+++ b/kernel/time/posix-timers.c
@@ -496,7 +496,7 @@ static int do_timer_create(clockid_t whi
 	 * 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);
 	spin_unlock_irq(&current->sighand->siglock);
 	/*
 	 * After unlocking sighand::siglock @new_timer is subject to
@@ -1072,7 +1072,7 @@ static int posix_timer_delete(struct k_i
 		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);
 	}