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sched: enable early use of sched_clock()

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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>
This commit is contained in:
Ingo Molnar 2007-12-07 19:02:47 +01:00
parent 5f9fa8a62d
commit 8ced5f69e4
1 changed files with 6 additions and 1 deletions
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7
kernel/sched.c
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@ -488,7 +488,12 @@ unsigned long long cpu_clock(int cpu)
local_irq_save(flags);
rq = cpu_rq(cpu);
update_rq_clock(rq);
/*
* 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);