linux-kernel - Re: [patch 10/26] SLUB: Faster more efficient slab determination for _

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Message-ID: <Pine.LNX.4.64.0706191533580.7633@schroedinger.engr.sgi.com>
Date:	Tue, 19 Jun 2007 15:38:01 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Andrew Morton <akpm@...ux-foundation.org>
cc:	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Pekka Enberg <penberg@...helsinki.fi>,
	suresh.b.siddha@...el.com
Subject: Re: [patch 10/26] SLUB: Faster more efficient slab determination
 for __kmalloc.

On Tue, 19 Jun 2007, Andrew Morton wrote:

> On Tue, 19 Jun 2007 15:22:36 -0700 (PDT)
> Christoph Lameter <clameter@....com> wrote:
> 
> > On Tue, 19 Jun 2007, Andrew Morton wrote:
> > 
> > > On Mon, 18 Jun 2007 02:58:48 -0700
> > > clameter@....com wrote:
> > > 
> > > > +	BUG_ON(KMALLOC_MIN_SIZE > 256 ||
> > > > +		(KMALLOC_MIN_SIZE & (KMALLOC_MIN_SIZE - 1)));
> > > 
> > > BUILD_BUG_ON?
> > > 
> > Does not matter. That code is __init.
> 
> Finding out at compile time is better.

Ok and BUILD_BUG_ON really works? Had some bad experiences with it.

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

Index: linux-2.6.22-rc4-mm2/mm/slub.c
===================================================================
--- linux-2.6.22-rc4-mm2.orig/mm/slub.c	2007-06-19 15:36:57.000000000 -0700
+++ linux-2.6.22-rc4-mm2/mm/slub.c	2007-06-19 15:37:05.000000000 -0700
@@ -3079,7 +3079,7 @@ void __init kmem_cache_init(void)
 	 * Make sure that nothing crazy happens if someone starts tinkering
 	 * around with ARCH_KMALLOC_MINALIGN
 	 */
-	BUG_ON(KMALLOC_MIN_SIZE > 256 ||
+	BUILD_BUG_ON(KMALLOC_MIN_SIZE > 256 ||
 		(KMALLOC_MIN_SIZE & (KMALLOC_MIN_SIZE - 1)));
 
 	for (i = 8; i < KMALLOC_MIN_SIZE;i++)
 
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