From db273be2a7d42f92b3471e0f717982928214a650 Mon Sep 17 00:00:00 2001 From: Thomas Gleixner Date: Fri, 7 Feb 2014 20:58:38 +0100 Subject: [PATCH] sched: Check for idle task in might_sleep() Idle is not allowed to call sleeping functions ever! Signed-off-by: Thomas Gleixner Signed-off-by: Sebastian Andrzej Siewior Signed-off-by: Peter Zijlstra Link: http://lkml.kernel.org/r/1391803122-4425-3-git-send-email-bigeasy@linutronix.de Signed-off-by: Ingo Molnar --- kernel/sched/core.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 06da865043ec..a01fe6cfdb9b 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -6927,7 +6927,8 @@ void __might_sleep(const char *file, int line, int preempt_offset) static unsigned long prev_jiffy; /* ratelimiting */ rcu_sleep_check(); /* WARN_ON_ONCE() by default, no rate limit reqd. */ - if ((preempt_count_equals(preempt_offset) && !irqs_disabled()) || + if ((preempt_count_equals(preempt_offset) && !irqs_disabled() && + !is_idle_task(current)) || system_state != SYSTEM_RUNNING || oops_in_progress) return; if (time_before(jiffies, prev_jiffy + HZ) && prev_jiffy) -- 2.20.1