linux-kernel - Re: console_cpu_notify can cause scheduling BUG during CPU hotplug

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Message-ID: <BANLkTimPHaiiiVC_A6jtUtaa_pYJuhepYg@mail.gmail.com>
Date:	Mon, 25 Apr 2011 17:18:37 -0700
From:	Kevin Cernekee <cernekee@...il.com>
To:	Michael Bohan <mbohan@...eaurora.org>
Cc:	mingo@...e.hu, akpm@...ux-foundation.org,
	simon.kagstrom@...insight.net, David.Woodhouse@...el.com,
	lethal@...ux-sh.org, tj@...nel.org, linux-kernel@...r.kernel.org,
	linux-arm-msm@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	"Shilimkar, Santosh" <santosh.shilimkar@...com>
Subject: Re: console_cpu_notify can cause scheduling BUG during CPU hotplug

On Mon, Apr 25, 2011 at 4:33 PM, Michael Bohan <mbohan@...eaurora.org> wrote:
> I was curious if this scenario was accounted for in the design of the
> console CPU notifier. One workaround for this problem is to remove CPU_DEAD
> from the possible actions in console_cpu_notify(). In fact, v1-v4 of the
> patch above did not have CPU_DEAD, CPU_DYING or CPU_DOWN_FAILED in the list
> of actions. I wasn't able to track down why the other cases were added in
> the final patch.

Here is the background information on the CPU_{DEAD,DYING,DOWN_FAILED} cases:

http://lkml.org/lkml/2010/6/29/65
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