linux-kernel - Re: [PATCH 02/12] sched: Fix set_cpu_active() in cpu

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Message-ID: <1260986179.21028.151.camel@laptop>
Date:	Wed, 16 Dec 2009 18:56:19 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Mike Galbraith <efault@....de>, linux-kernel@...r.kernel.org,
	Xiaotian Feng <dfeng@...hat.com>
Subject: Re: [PATCH 02/12] sched: Fix set_cpu_active() in cpu_down()

On Wed, 2009-12-16 at 18:04 +0100, Peter Zijlstra wrote:
> plain text document attachment (foo13.patch)

still need to fix quilt...

From: Xiaotian Feng <dfeng@...hat.com>

> Sachin found cpu hotplug test failures on powerpc, which made the
> kernel hang on his POWER box. 
> 
> The problem is that we fail to re-activate a cpu when a hot-unplug
> fails. Fix this by moving the de-activation into _cpu_down after doing
> the initial checks.
> 
> Remove the synchronize_sched() calls and rely on those implied by
> rebuilding the sched domains using the new mask.
> 
> Reported-by: Sachin Sant <sachinp@...ibm.com>
> Signed-off-by: Xiaotian Feng <dfeng@...hat.com>
> Tested-by: Sachin Sant <sachinp@...ibm.com>
> Signed-off-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>

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