linux-kernel - Re: [PATCH] slab: deal with NULL pointers passed to kmem_cache

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Message-Id: <20070321083027.437361f1.akpm@linux-foundation.org>
Date:	Wed, 21 Mar 2007 08:30:27 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	"Pekka Enberg" <penberg@...helsinki.fi>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	"Jarek Poplawski" <jarkao2@...pl>,
	"Eric Dumazet" <dada1@...mosbay.com>, mpm@...enic.com,
	"Christoph Lameter" <clameter@....com>,
	"ast@...dv.de" <ast@...dv.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] slab: deal with NULL pointers passed to kmem_cache_free

On Wed, 21 Mar 2007 16:41:19 +0200 "Pekka Enberg" <penberg@...helsinki.fi> wrote:

> On 3/21/07, Rafael J. Wysocki <rjw@...k.pl> wrote:
> > IMHO one way to find them is to actually slow down kmem_cache_free() and see
> > where the performance is hurt.
> 
> Yeah, I'll try to sneak a patch past Andrew.

That would be sneaky.

Thing is, such a patch would amount to adding a test-for-NULL to codepaths
which we *know* do not need it.  There is no point in doing that.
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