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

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Message-ID: <Pine.LNX.4.64.0703201140350.8561@schroedinger.engr.sgi.com>
Date:	Tue, 20 Mar 2007 11:41:37 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Pekka Enberg <penberg@...helsinki.fi>
cc:	Andrew Morton <akpm@...ux-foundation.org>, mpm@...enic.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 Tue, 20 Mar 2007, Pekka Enberg wrote:

> On 3/19/07, Andrew Morton <akpm@...ux-foundation.org> wrote:
> > The BUG_ON (at least) should probably be moved into CONFIG_DEBUG_SLAB.
> 
> No it shouldn't. Letting non-slab pages pass through causes nasty and
> hard to debug problems which is why we have the BUG_ONs in the first
> place:

CONFIG_DEBUG_SLAB is there in order to handle these nasty and hard to 
debug problems. Usually non-slab pages are not passed to kmem_cache_free.

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