linux-kernel - [patch 1/2] slqb: fix small zero size alloc bug

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Message-ID: <20090203135559.GA8723@wotan.suse.de>
Date:	Tue, 3 Feb 2009 14:55:59 +0100
From:	Nick Piggin <npiggin@...e.de>
To:	Pekka Enberg <penberg@...helsinki.fi>,
	Linux Memory Management List <linux-mm@...ck.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: [patch 1/2] slqb: fix small zero size alloc bug


Fix a problem where SLQB did not correctly return ZERO_SIZE_PTR for a
zero sized allocation.

Signed-off-by: Nick Piggin <npiggin@...e.de>

---
 include/linux/slqb_def.h |    2 +-
 mm/slqb.c                |    2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

Index: linux-2.6/include/linux/slqb_def.h
===================================================================
--- linux-2.6.orig/include/linux/slqb_def.h
+++ linux-2.6/include/linux/slqb_def.h
@@ -237,7 +237,7 @@ static __always_inline struct kmem_cache
 
 	index = kmalloc_index(size);
 	if (unlikely(index == 0))
-		return NULL;
+		return ZERO_SIZE_PTR;
 
 	if (likely(!(flags & SLQB_DMA)))
 		return &kmalloc_caches[index];
--
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