Re: linux-next: build failure after merge of the tip tree

From: Peter Zijlstra
Date: Sat Jan 18 2014 - 16:55:09 EST

On Sat, Jan 18, 2014 at 11:14:57AM -0800, H. Peter Anvin wrote:
> >> Could something like this work?
> >>
> >> local_irq_enable();
> >> mwait_idle_with_hints(0,0);
> >>

> This means an interrupt window is open and we can take an interrupt
> between checking need_resched and the MWAIT, which couldn't happen with
> __sti_mwait().
> Are we sure that is actually safe?

current_set_polling_and_test() vs resched_task() should be good that
way, but I've got a terrible head-ache today so don't rely on anything
much I say.
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