linux-kernel - Re: [PATCH 2/3] stop_machine: dequeue work before signal completion

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Message-ID: <CAJd=RBBDC7oU0Zqm=zyr+UwjcHFBvMA2LXgYfMrEOeQ567xp2Q@mail.gmail.com>
Date:	Thu, 7 Feb 2013 19:53:53 +0800
From:	Hillf Danton <dhillf@...il.com>
To:	Tejun Heo <tj@...nel.org>
Cc:	Namhyung Kim <namhyung@...nel.org>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/3] stop_machine: dequeue work before signal completion

On Thu, Feb 7, 2013 at 10:29 AM, Tejun Heo <tj@...nel.org> wrote:
> On Wed, Feb 6, 2013 at 6:21 PM, Namhyung Kim <namhyung@...nel.org> wrote:
>>> Why does this matter?  It's inside spinlock.  What's being made better
>>> by this change?
>>
>> IIUC the work should be deleted from the list, otherwise it'd trigger
>> BUG_ON when the cpu gets online again.
>
> Ah, okay, the original code was missing list_del_init(), so we end up
> with trashy work list if CPU goes down while there are pending work
> items which will trigger BUG_ON() later when the CPU comes back on.
>
> Hillf, can you please redo the patch description?

Sure, thanks;)
Hillf
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