linux-kernel - Re: [PATCH 2/2] sched: Pull resched loop to _

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Date:	Mon, 15 Dec 2014 11:16:13 -0800
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	Ingo Molnar <mingo@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH 2/2] sched: Pull resched loop to __schedule() callers

On Mon, Dec 15, 2014 at 8:32 AM, Frederic Weisbecker <fweisbec@...il.com> wrote:
>
> But it may have an impact on some context checkers that rely on in_atomic*()
> which ignore the PREEMPT_ACTIVE value. It shouldn't ignore that though but I
> guess it's a hack for some specific situation.

I think we should remove it. The only reason for it is the scheduler
itself, which used to have the in_atomic() check (ok, still has, it's
just called "in_atomic_preempt_off()").

But yes, if we keep the "mask off PREEMPT_ACTIVE" in in_atomic(), then
we do need to update the counts with "PREEMPT_ACTIVE+1" instead. Or
something like that.

                Linus
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