Re: [PATCH] convert cnt32_to_63 to inline

[Peter Zijlstra]

On Tue, 2008-11-11 at 22:31 +0000, David Howells wrote:
> Mathieu Desnoyers <mathieu.desnoyers@xxxxxxxxxx> wrote:
> 
> > @@ -52,18 +57,22 @@ unsigned long long sched_clock(void)
> > ...
> > +	preempt_disable_notrace();
> 
> Please, no!  sched_clock() is called with preemption or interrupts disabled
> everywhere except from some debugging code (lock tracing IIRC).  If you need
> to insert this preemption disablement somewhere, please insert it there.  At
> least then sched_clock() will be called consistently.

Agreed. You could do a WARN_ON(!in_atomic); in sched_clock() depending
on DEBUG_PREEMPT or something to ensure this.

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