linux-kernel - Re: SLUB: simplify re on_each

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Date:	Thu, 17 Jul 2008 14:55:26 +0200
From:	"Vegard Nossum" <vegard.nossum@...il.com>
To:	"Robin Holt" <holt@....com>
Cc:	"Pekka Enberg" <penberg@...helsinki.fi>,
	"Alexey Dobriyan" <adobriyan@...il.com>, cl@...ux-foundation.org,
	linux-kernel@...r.kernel.org
Subject: Re: SLUB: simplify re on_each_cpu()

On Thu, Jul 17, 2008 at 2:39 PM, Robin Holt <holt@....com> wrote:
> On Thu, Jul 17, 2008 at 03:26:46PM +0300, Pekka Enberg wrote:
>> Hi Robin,
>>
>> On Wed, Jul 16, 2008 at 09:29:02PM +0400, Alexey Dobriyan wrote:
>> >> on_each_cpu() expands to function call on UP, too.
>>
>> On Thu, Jul 17, 2008 at 2:38 PM, Robin Holt <holt@....com> wrote:
>> > It looks to me like on_each_cpu is a #define for !SMP.  Are you certain
>> > of the need for this change?  Are you looking at a different tree than
>> > Linus'?
>>
>> I think it's actually you who is looking at an older tree.
>
> I did a git-checkout of
> git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git
> which got me commit id 33af79d12e0fa25545d49e86afc67ea8ad5f2f40
> and looked at include/linux/smp.h line 123.  It has:
>
> #define on_each_cpu(func,info,wait)             \
>        ({                                      \
>                local_irq_disable();            \
>                func(info);                     \

That's the function call right there :-)


Vegard

-- 
"The animistic metaphor of the bug that maliciously sneaked in while
the programmer was not looking is intellectually dishonest as it
disguises that the error is the programmer's own creation."
	-- E. W. Dijkstra, EWD1036
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