linux-kernel - Re: [PATCH] slub: Disable the lockless allocator

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Date:	Sat, 26 Mar 2011 16:36:51 -0500 (CDT)
From:	Christoph Lameter <cl@...ux.com>
To:	Ingo Molnar <mingo@...e.hu>
cc:	Eric Dumazet <eric.dumazet@...il.com>,
	Pekka Enberg <penberg@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	tj@...nel.org, npiggin@...nel.dk, rientjes@...gle.com,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH] slub: Disable the lockless allocator

On Sat, 26 Mar 2011, Ingo Molnar wrote:

> > Subject: per_cpu: Fixup cmpxchg_double for !SMP
> >
> > cmpxchg_double should only be provided for SMP. In the UP case
> > the GS register is not defined and the function will fail.
> >
> > Signed-off-by: Christoph Lameter <cl@...ux.com>
>
> I.e. the bug got introduced by:
>
>  | commit b9ec40af0e18fb7d02106be148036c2ea490fdf9
>  | Author: Christoph Lameter <cl@...ux.com>
>  | Date:   Mon Feb 28 11:02:24 2011 +0100
>  |
>  |     percpu, x86: Add arch-specific this_cpu_cmpxchg_double() support
>
> and then the lockless allocator made use of it, right?

Correct.

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