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

[Steven Rostedt <rostedt@goodmis.org>]

[-- Attachment #1: 0004-sched-Check-for-idle-task-in-might_sleep.patch --]
[-- Type: text/plain, Size: 985 bytes --]

From: Thomas Gleixner <tglx@linutronix.de>

Idle is not allowed to call sleeping functions ever!

Cc: stable-rt@vger.kernel.org
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
---
 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 e979551..751ec60 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -7536,7 +7536,8 @@ 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