Re: [block IO crash] Re: 2.6.39-rc5-git2 boot crashs

[Pekka Enberg]

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@xxxxxxxxx>

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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