linux-kernel - Re: kmalloc zero size changes break i386

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Date:	Thu, 19 Jul 2007 12:19:29 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Roland Dreier <rdreier@...co.com>
cc:	Pekka Enberg <penberg@...helsinki.fi>, Andi Kleen <ak@...e.de>,
	Christoph Lameter <clameter@....com>,
	linux-kernel@...r.kernel.org,
	"Michael S. Tsirkin" <mst@....mellanox.co.il>
Subject: Re: kmalloc zero size changes break i386



On Thu, 19 Jul 2007, Linus Torvalds wrote:
> 
> Does something like this fix it?
> 
> Christoph, please go over this and see if there are other cases like that.

Actually, here's a better version, I think.

Andi, does this patch fix your problem?

		Linus
---
 mm/slab.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/mm/slab.c b/mm/slab.c
index 88bc633..c3feeaa 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -3690,8 +3690,8 @@ static __always_inline void *__do_kmalloc(size_t size, gfp_t flags,
 	 * functions.
 	 */
 	cachep = __find_general_cachep(size, flags);
-	if (unlikely(cachep == NULL))
-		return NULL;
+	if (unlikely(ZERO_OR_NULL_PTR(cachep)))
+		return cachep;
 	return __cache_alloc(cachep, flags, caller);
 }
 
-
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