linux-kernel - Re: select(0, ..) is valid ?

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Message-ID: <Pine.LNX.4.64.0705151136150.31972@schroedinger.engr.sgi.com>
Date:	Tue, 15 May 2007 11:36:43 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Andrew Morton <akpm@...ux-foundation.org>
cc:	Badari Pulavarty <pbadari@...ibm.com>, netdev@...r.kernel.org,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: select(0, ..) is valid ?

On Tue, 15 May 2007, Andrew Morton wrote:

> Perhaps putting a size=0 detector into slab also would speed this
> process up.

Signed-off-by: Christoph Lameter <clameter@....com>

Index: linux-2.6/mm/slab.c
===================================================================
--- linux-2.6.orig/mm/slab.c	2007-05-15 11:32:25.000000000 -0700
+++ linux-2.6/mm/slab.c	2007-05-15 11:35:55.000000000 -0700
@@ -792,6 +792,7 @@ static inline struct kmem_cache *__find_
 	 */
 	BUG_ON(malloc_sizes[INDEX_AC].cs_cachep == NULL);
 #endif
+	WARN_ON_ONCE(size == 0);
 	while (size > csizep->cs_size)
 		csizep++;
 
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