linux-kernel - Re: [patch 3/7] Allocpercpu: Do __percpu_disguise() only if CONFIG_DEBUG

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Date:	Thu, 01 Nov 2007 08:25:55 +0100
From:	Eric Dumazet <dada1@...mosbay.com>
To:	Christoph Lameter <clameter@....com>
CC:	akpm@...ux-foundation.org, linux-arch@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>,
	Pekka Enberg <penberg@...helsinki.fi>
Subject: Re: [patch 3/7] Allocpercpu: Do __percpu_disguise() only if CONFIG_DEBUG_VM
 is set

Christoph Lameter a écrit :
> Disguising costs a few cycles in the hot paths. So switch it off if
> we are not debuggin.
> 
> Signed-off-by: Christoph Lameter <clameter@....com>
> 
> ---
>  include/linux/percpu.h |    4 ++++
>  1 file changed, 4 insertions(+)
> 
> Index: linux-2.6/include/linux/percpu.h
> ===================================================================
> --- linux-2.6.orig/include/linux/percpu.h	2007-10-31 16:40:14.892121256 -0700
> +++ linux-2.6/include/linux/percpu.h	2007-10-31 16:41:00.907621059 -0700
> @@ -33,7 +33,11 @@
>  
>  #ifdef CONFIG_SMP
>  
> +#ifdef CONFIG_DEBUG_VM
>  #define __percpu_disguise(pdata) ((void *)~(unsigned long)(pdata))
> +#else
> +#define __percpu_disguide(pdata) ((void *)(pdata))
> +#endif

Yes good idea, but a litle typo here :)
-
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