Re: [RFC][PATCH] dm: Remove dm_bufio_cond_resched()

From: Peter Zijlstra
Date: Fri Sep 23 2016 - 05:05:36 EST

On Fri, Sep 23, 2016 at 10:00:37AM +0200, Thomas Gleixner wrote:
> On Fri, 23 Sep 2016, Peter Zijlstra wrote:
> > It is, might_sleep() implies might_resched(). In fact, that's all what
> > PREEMPT_VOLUNTARY is, make the might_sleep() debug test imply a resched
> > point.
> Grr, how intuitive - NOT!

No, it actually makes sense. Because you 'obviously' only call
might_sleep() in contexts that should be able to sleep (if not, it'll
holler). So they're already placed right for preemption.