linux-kernel - Re: [PATCH 2.6.32-rc6] sched, kvm: fix race condition involving sched_in_preempt

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Date:	Fri, 13 Nov 2009 10:55:16 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Tejun Heo <tj@...nel.org>
Cc:	Avi Kivity <avi@...hat.com>, lkml <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...hat.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH 2.6.32-rc6] sched, kvm: fix race condition involving
 sched_in_preempt_notifers


* Tejun Heo <tj@...nel.org> wrote:

> In finish_task_switch(), fire_sched_in_preempt_notifiers() is called
> after finish_lock_switch().  However, depending on architecture,
> preemption can be enabled after finish_lock_switch() which breaks the
> semantics of preempt notifiers.  Move it before finish_arch_switch().
> This also makes in notifiers symmetric to out notifiers in terms of
> locking - now both are called under rq lock.
> 
> NOT_SIGNED_OFF_YET
> Cc: Ingo Molnar <mingo@...hat.com>
> Cc: Avi Kivity <avi@...hat.com>
> ---
> Avi, I think kvm should be fine with this but I haven't tested it.
> Does this look okay to you?  If so, can you please route this through
> kvm tree with my signoff?

I'd like to have Avi's Ack for it, but we want to do sched.c changes via 
the scheduler tree.

	Ingo
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