linux-kernel - Re: [PATCH 2/4] generic-smp: remove kmalloc usage

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Message-ID: <20090219122112.GD1703@elte.hu>
Date:	Thu, 19 Feb 2009 13:21:12 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	Rusty Russell <rusty@...tcorp.com.au>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Nick Piggin <npiggin@...e.de>,
	Jens Axboe <jens.axboe@...cle.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	linux-kernel@...r.kernel.org, Oleg Nesterov <oleg@...hat.com>
Subject: Re: [PATCH 2/4] generic-smp: remove kmalloc usage


* Jeremy Fitzhardinge <jeremy@...p.org> wrote:

> Ingo Molnar wrote:
>> The kmalloc(GFP_ATOMIC) has been in kernel/smp.c for about half a year, 
>> since:
>>
>>  |  commit 3d4422332711ef48ef0f132f1fcbfcbd56c7f3d1
>>  |  Author: Jens Axboe <jens.axboe@...cle.com>
>>  |  Date:   Thu Jun 26 11:21:34 2008 +0200
>>  |  Subject: [PATCH] Add generic helpers for arch IPI function calls
>>
>> Which introduced kernel/smp.c to begin with. It got merged on July 15.
>>   
>
> The kmalloc to resolve the stack lifetime vs rcu bug is more 
> recent than that - around August, I think.

yeah, it was in a late -rc, and solved rare crashes that you 
reported.

	Ingo
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