From: Peter Zijlstra <a.p.zijlstra@chello.nl>
To: "Frédéric Weisbecker" <fweisbec@gmail.com>
Cc: Li Zefan <lizf@cn.fujitsu.com>,
hpa@zytor.com, linux-kernel@vger.kernel.org, tglx@linutronix.de,
mingo@elte.hu, linux-tip-commits@vger.kernel.org
Subject: Re: [tip:sched/core] sched: Pull up the might_sleep() check into cond_resched()
Date: Wed, 22 Jul 2009 19:56:43 +0200 [thread overview]
Message-ID: <1248285403.4711.0.camel@laptop> (raw)
In-Reply-To: <c62985530907221017i427b1ae1s8cbb593106c658a1@mail.gmail.com>
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 ;-)
next prev parent reply other threads:[~2009-07-22 17:57 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-07-16 6:28 [PATCH 1/7] sched: Drop the need_resched() loop from cond_resched() Frederic Weisbecker
2009-07-16 6:28 ` [PATCH 2/7] sched: Remove obsolete comment in __cond_resched() Frederic Weisbecker
2009-07-18 14:21 ` [tip:sched/core] " tip-bot for Frederic Weisbecker
2009-07-16 6:28 ` [PATCH 3/7] sched: Cover the CONFIG_DEBUG_SPINLOCK_SLEEP off-case for __might_sleep() Frederic Weisbecker
2009-07-18 14:21 ` [tip:sched/core] " tip-bot for Frederic Weisbecker
2009-07-16 6:28 ` [PATCH 4/7] sched: Add a preempt count base offset to __might_sleep() Frederic Weisbecker
2009-07-16 14:14 ` Peter Zijlstra
2009-07-16 14:34 ` Peter Zijlstra
2009-07-16 14:42 ` Frederic Weisbecker
2009-07-18 14:22 ` [tip:sched/core] " tip-bot for Frederic Weisbecker
2009-07-16 6:28 ` [PATCH 5/7] sched: Remove the CONFIG_PREEMPT_BKL case definition of cond_resched() Frederic Weisbecker
2009-07-18 14:22 ` [tip:sched/core] " tip-bot for Frederic Weisbecker
2009-07-16 6:28 ` [PATCH 6/7 v3] sched: Pull up the might_sleep() check in cond_resched() Frederic Weisbecker
2009-07-18 14:22 ` [tip:sched/core] sched: Pull up the might_sleep() check into cond_resched() tip-bot for Frederic Weisbecker
2009-07-20 6:50 ` Li Zefan
2009-07-20 8:12 ` Frederic Weisbecker
2009-07-20 8:49 ` Peter Zijlstra
2009-07-20 9:13 ` Frederic Weisbecker
2009-07-20 11:56 ` Ingo Molnar
2009-07-20 11:39 ` Peter Zijlstra
2009-07-22 17:17 ` Frédéric Weisbecker
2009-07-22 17:56 ` Peter Zijlstra [this message]
2009-07-16 6:28 ` [PATCH 7/7] sched: Convert the only user of cond_resched_bkl to use cond_resched() Frederic Weisbecker
2009-07-18 14:22 ` [tip:sched/core] " tip-bot for Frederic Weisbecker
2009-07-18 14:21 ` [tip:sched/core] sched: Drop the need_resched() loop from cond_resched() tip-bot for Frederic Weisbecker
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