linux-kernel - [PATCH linux-5.2.y-rt only] hrtimer: correct the logic for grab expiry lock

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Date:   Wed, 12 Aug 2020 18:50:53 +0800
From:   <zhantao.tang@...driver.com>
To:     <linux-kernel@...r.kernel.org>
CC:     <bigeasy@...utronix.de>, <tglx@...utronix.de>,
        <rostedt@...dmis.org>, <linux-rt-users@...r.kernel.org>
Subject: [PATCH linux-5.2.y-rt only] hrtimer: correct the logic for grab expiry lock

From: Zhantao Tang <zhantao.tang@...driver.com>

In commit: 47b6de0b7f22 ("hrtimer: Add a missing bracket and hide `migration_base' on !SMP")
a inline function is_migration_base() is introduced. But
the logic of the hrtimer_grab_expiry_lock was changed.

This patch is to correct it.

Signed-off-by: Zhantao Tang <zhantao.tang@...driver.com>
---
 kernel/time/hrtimer.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/time/hrtimer.c b/kernel/time/hrtimer.c
index b3adac366fd1..6b47e310c68e 100644
--- a/kernel/time/hrtimer.c
+++ b/kernel/time/hrtimer.c
@@ -944,7 +944,7 @@ void hrtimer_grab_expiry_lock(const struct hrtimer *timer)
 {
 	struct hrtimer_clock_base *base = READ_ONCE(timer->base);
 
-	if (timer->is_soft && is_migration_base(base)) {
+	if (timer->is_soft && !is_migration_base(base)) {
 		spin_lock(&base->cpu_base->softirq_expiry_lock);
 		spin_unlock(&base->cpu_base->softirq_expiry_lock);
 	}
-- 
2.17.1