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Date: Wed, 18 Feb 2009 16:00:06 -0800
From: Jeremy Fitzhardinge <jeremy@goop.org>
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To: Ingo Molnar <mingo@elte.hu>
CC: Rusty Russell <rusty@rustcorp.com.au>,
       Peter Zijlstra <a.p.zijlstra@chello.nl>,
       Linus Torvalds <torvalds@linux-foundation.org>,
       Nick Piggin <npiggin@suse.de>, Jens Axboe <jens.axboe@oracle.com>,
       "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
       Steven Rostedt <rostedt@goodmis.org>, linux-kernel@vger.kernel.org,
       Oleg Nesterov <oleg@redhat.com>
Subject: Re: [PATCH 2/4] generic-smp: remove kmalloc usage
References: <20090216163847.431174825@chello.nl> <1234859071.4744.10.camel@laptop> <20090217094359.GA1231@elte.hu> <200902181520.17504.rusty@rustcorp.com.au> <20090218160535.GD23989@elte.hu>
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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@oracle.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.

    J