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Commit 84b8945f authored by Arve Hjønnevåg's avatar Arve Hjønnevåg Committed by Ruchi Kandoi
Browse files

sched: Enable might_sleep before initializing drivers. 



This allows detection of init bugs in built-in drivers.

Signed-off-by: default avatarArve Hjønnevåg <arve@android.com>
parent 0e5a766a

kernel/sched/core.c

+12 −2
Original line number Diff line number Diff line
@@ -7176,14 +7176,24 @@ static inline int preempt_count_equals(int preempt_offset) 
	return (nested == preempt_offset);

}



static int __might_sleep_init_called;

int __init __might_sleep_init(void)

{

	__might_sleep_init_called = 1;

	return 0;

}

early_initcall(__might_sleep_init);



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() &&

	     !is_idle_task(current)) ||

	    system_state != SYSTEM_RUNNING || oops_in_progress)

	     !is_idle_task(current)) || oops_in_progress)

		return;

	if (system_state != SYSTEM_RUNNING &&

	    (!__might_sleep_init_called || system_state != SYSTEM_BOOTING))

		return;

	if (time_before(jiffies, prev_jiffy + HZ) && prev_jiffy)

		return;