[PATCH RT 4/6] sched: Check for idle task in might_sleep()

[Steven Rostedt]

From: Thomas Gleixner <tglx@xxxxxxxxxxxxx>

Idle is not allowed to call sleeping functions ever!

Cc: stable-rt@xxxxxxxxxxxxxxx
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Signed-off-by: Steven Rostedt <rostedt@xxxxxxxxxxx>
---
 kernel/sched.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/kernel/sched.c b/kernel/sched.c
index 20b228f..14219ed 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -8937,7 +8937,8 @@ 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)
-- 
1.7.10.4


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