linux-kernel - [119/200] SLUB: Allow full duplication of kmalloc array for 390

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Message-Id: <20100701174256.472164764@clark.site>
Date:	Thu, 01 Jul 2010 10:43:29 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Christoph Lameter <cl@...ux-foundation.org>,
	Pekka Enberg <penberg@...helsinki.fi>
Subject: [119/200] SLUB: Allow full duplication of kmalloc array for 390

2.6.34-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Christoph Lameter <cl@...ux-foundation.org>

commit 0f1f694260e0d35b5ce7d471f6e679c3dd4d7d94 upstream.

Commit 756dee75872a2a764b478e18076360b8a4ec9045 ("SLUB: Get rid of dynamic DMA
kmalloc cache allocation") makes S390 run out of kmalloc caches.  Increase the
number of kmalloc caches to a safe size.

Reported-by: Heiko Carstens <heiko.carstens@...ibm.com>
Tested-by: Heiko Carstens <heiko.carstens@...ibm.com>
Signed-off-by: Christoph Lameter <cl@...ux-foundation.org>
Signed-off-by: Pekka Enberg <penberg@...helsinki.fi>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 include/linux/slub_def.h |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/include/linux/slub_def.h
+++ b/include/linux/slub_def.h
@@ -132,7 +132,7 @@ struct kmem_cache {
 #ifdef CONFIG_ZONE_DMA
 #define SLUB_DMA __GFP_DMA
 /* Reserve extra caches for potential DMA use */
-#define KMALLOC_CACHES (2 * SLUB_PAGE_SHIFT - 6)
+#define KMALLOC_CACHES (2 * SLUB_PAGE_SHIFT)
 #else
 /* Disable DMA functionality */
 #define SLUB_DMA (__force gfp_t)0


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