Commit 8ced5f69 authored Dec 07, 2007 by Ingo Molnar

sched: enable early use of sched_clock()



some platforms have sched_clock() implementations that cannot be called
very early during wakeup. If it's called it might hang or crash in hard
to debug ways. So only call update_rq_clock() [which calls sched_clock()]
if sched_init() has already been called. (rq->idle is NULL before the
scheduler is initialized.)

Signed-off-by: Ingo Molnar <mingo@elte.hu>

parent 5f9fa8a6

kernel/sched.c

+6 −1

Original line number	Diff line number	Diff line
		@@ -488,6 +488,11 @@ unsigned long long cpu_clock(int cpu)

		local_irq_save(flags);
		rq = cpu_rq(cpu);
		/*
		* Only call sched_clock() if the scheduler has already been
		* initialized (some code might call cpu_clock() very early):
		*/
		if (rq->idle)
		update_rq_clock(rq);
		now = rq->clock;
		local_irq_restore(flags);