From: Anna-Maria Gleixner <anna-maria@linutronix.de> To: linux-kernel@vger.kernel.org Cc: bigeasy@linutronix.de, tglx@linutronix.de, frederic@kernel.org, bristot@redhat.com, paulmck@linux.vnet.ibm.com, peterz@infradead.org, Anna-Maria Gleixner <anna-maria@linutronix.de> Subject: [PATCH] nohz: Fix local_timer_softirq_pending() Date: Tue, 31 Jul 2018 18:13:58 +0200 Message-ID: <20180731161358.29472-1-anna-maria@linutronix.de> (raw) local_timer_softirq_pending() checks whether the timer softirq is pending with: local_softirq_pending() & TIMER_SOFTIRQ. This is wrong because TIMER_SOFTIRQ is the softirq number and not a bitmask. So the test checks for the wrong bit. Use BIT(TIMER_SOFTIRQ) instead. Fixes: 5d62c183f9e9 ("nohz: Prevent a timer interrupt storm in tick_nohz_stop_sched_tick()") Signed-off-by: Anna-Maria Gleixner <anna-maria@linutronix.de> --- kernel/time/tick-sched.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c index da9455a6b42b..5b33e2f5c0ed 100644 --- a/kernel/time/tick-sched.c +++ b/kernel/time/tick-sched.c @@ -642,7 +642,7 @@ static void tick_nohz_restart(struct tick_sched *ts, ktime_t now) static inline bool local_timer_softirq_pending(void) { - return local_softirq_pending() & TIMER_SOFTIRQ; + return local_softirq_pending() & BIT(TIMER_SOFTIRQ); } static ktime_t tick_nohz_next_event(struct tick_sched *ts, int cpu) -- 2.18.0
next reply index Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top 2018-07-31 16:13 Anna-Maria Gleixner [this message] 2018-07-31 16:50 ` Paul E. McKenney 2018-07-31 17:07 ` Daniel Bristot de Oliveira 2018-07-31 17:14 ` Frederic Weisbecker 2018-07-31 20:13 ` [tip:timers/urgent] " tip-bot for Anna-Maria Gleixner
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