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

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Message-ID: <4DB65EEC.7060604@ti.com>
Date:	Tue, 26 Apr 2011 11:28:04 +0530
From:	Santosh Shilimkar <santosh.shilimkar@...com>
To:	Kevin Cernekee <cernekee@...il.com>
CC:	Michael Bohan <mbohan@...eaurora.org>, 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
Subject: Re: console_cpu_notify can cause scheduling BUG during CPU hotplug

On 4/26/2011 5:48 AM, Kevin Cernekee wrote:
> 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
That's right.
May be the change log for commit '034260d67' would have been
bit more descriptive about the CPU hot-plug events.

Regards
Santosh


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