linux-kernel - Re: [PATCH] release quicklist before free

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Message-ID: <20070723182301.GA27789@elte.hu>
Date:	Mon, 23 Jul 2007 20:23:01 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Daniel Walker <dwalker@...sta.com>
Cc:	Peter Zijlstra <peterz@...radead.org>, paulmck@...ux.vnet.ibm.com,
	linux-kernel@...r.kernel.org, linux-rt-users@...r.kernel.org
Subject: Re: [PATCH] release quicklist before free_page


* Daniel Walker <dwalker@...sta.com> wrote:

> > Not quite, it uses preempt_disable() to avoid migration and stick to 
> > a cpu. Without that it might end up freeing pages from another 
> > quicklist.

i.e. the patch hides a debug warning and there's possibly silent data 
corruption - not good.

> > How about this - compile tested only
> 
> How about a comment to go with it ?  Which says something like what's 
> above, notes on how the locking is getting used..

how about: "if you've got some time then please also add a few comments, 
because the code was quite non-obvious to me and I misunderstood it when 
I tried to fix it. Thanks."

ok?

	Ingo
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