linux-kernel - Re: [tip:sched/core] sched: Pull up the might_sleep() check into cond

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Message-Id: <1248285403.4711.0.camel@laptop>
Date:	Wed, 22 Jul 2009 19:56:43 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Frédéric Weisbecker <fweisbec@...il.com>
Cc:	Li Zefan <lizf@...fujitsu.com>, hpa@...or.com,
	linux-kernel@...r.kernel.org, tglx@...utronix.de, mingo@...e.hu,
	linux-tip-commits@...r.kernel.org
Subject: Re: [tip:sched/core] sched: Pull up the might_sleep() check into 
 cond_resched()

On Wed, 2009-07-22 at 19:17 +0200, Frédéric Weisbecker wrote:

> Ah, I think I've got it. In case of !CONFIG_PREEMPT, the spinlocks of
> course don't play
> with preemption, making no change reflected in the preempt_count().
> The assumption of preempt_count() = 1
> is then false.

D'0h indeed. And I didn't hit that because the last time I build a !
CONFIG_PREEMPT kernel is like many years ago ;-)



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