Date: Wed, 4 May 2011 18:41:50 +0300 (EEST)
From: Pekka Enberg <penberg@kernel.org>
To: Christoph Lameter <cl@linux.com>
cc: Thomas Gleixner <tglx@linutronix.de>, Tejun Heo <tj@kernel.org>,
        Ingo Molnar <mingo@elte.hu>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Jens Axboe <axboe@kernel.dk>,
        Andrew Morton <akpm@linux-foundation.org>, werner <w.landgraf@ru.ru>,
        "H. Peter Anvin" <hpa@zytor.com>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [block IO crash] Re: 2.6.39-rc5-git2 boot crashs
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On Wed, 4 May 2011, Christoph Lameter wrote:
> Subject: slub: Remove CONFIG_CMPXCHG_LOCAL ifdeffery
>
> Remove the #ifdefs. This means that the irqsafe_cpu_cmpxchg_double() is used
> everywhere.
>
> There may be performance implications since:
>
> A. We now have to manage a transaction ID for all arches
>
> B. The interrupt holdoff for arches not supporting CONFIG_CMPXCHG_LOCAL is reduced
> to a very short irqoff section.
>
> There are no multiple irqoff/irqon sequences as a result of this change. Even in the fallback
> case we only have to do one disable and enable like before.
>
> Signed-off-by: Christoph Lameter <cl@linux.com>

This doesn't apply cleanly on top of slab/next which has some of your 
cleanup patches applied. There's some CONFIG_PREEMPT conflicts so I'd 
rather you rediffed it yourself.

 			Pekka
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