linux-kernel - [RFC PATCH 6/6] timers: Make process

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Message-Id: <20230801132441.559222-7-frederic@kernel.org>
Date:   Tue,  1 Aug 2023 15:24:41 +0200
From:   Frederic Weisbecker <frederic@...nel.org>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     Frederic Weisbecker <frederic@...nel.org>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        "Paul E . McKenney" <paulmck@...nel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Anna-Maria Behnsen <anna-maria@...utronix.de>,
        Eric Dumazet <edumazet@...gle.com>
Subject: [RFC PATCH 6/6] timers: Make process_timeout() soft-interruptible

The most frequent timer can be safely interrupted by other vectors as
it's only performing a wake-up.

Signed-off-by: Frederic Weisbecker <frederic@...nel.org>
---
 kernel/time/timer.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/time/timer.c b/kernel/time/timer.c
index 1e43f54def0e..0f6eb9c0901c 100644
--- a/kernel/time/timer.c
+++ b/kernel/time/timer.c
@@ -2180,7 +2180,7 @@ signed long __sched schedule_timeout(signed long timeout)
 	expire = timeout + jiffies;
 
 	timer.task = current;
-	timer_setup_on_stack(&timer.timer, process_timeout, 0);
+	timer_setup_on_stack(&timer.timer, process_timeout, TIMER_SOFTINTERRUPTIBLE);
 	__mod_timer(&timer.timer, expire, MOD_TIMER_NOTPENDING);
 	schedule();
 	del_timer_sync(&timer.timer);
-- 
2.34.1