From e5f0bdc7840bdb791247cb98dfc1dab6ea6c7da4 Mon Sep 17 00:00:00 2001
From: Thadeu Lima de Souza Cascardo <cascardo@holoscopio.com>
Date: Wed, 14 Sep 2011 16:21:08 -0700
Subject: um: disable CMPXCHG_DOUBLE as it breaks UML build

Commit b789ef518b2 ("slub: Add cmpxchg_double_slab()") tests for
cmpxchg_double support in the SLUB code and it breaks UML builds with
SLUB.  Since UML does not support checking for CPU features, disable
CMPXCHG_DOUBLE just like CMPXCHG_LOCAL is disabled for UML.

Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@holoscopio.com>
Reviewed-by: Christoph Lameter <cl@linux.com>
Cc: Jeff Dike <jdike@addtoit.com>
Cc: Richard Weinberger <richard@nod.at>
Signed-off-by: Richard Weinberger <richard@nod.at>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
 arch/um/Kconfig.x86 | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'arch')

diff --git a/arch/um/Kconfig.x86 b/arch/um/Kconfig.x86
index d31ecf346b4..21bebe63df6 100644
--- a/arch/um/Kconfig.x86
+++ b/arch/um/Kconfig.x86
@@ -10,6 +10,10 @@ config CMPXCHG_LOCAL
 	bool
 	default n
 
+config CMPXCHG_DOUBLE
+	bool
+	default n
+
 source "arch/x86/Kconfig.cpu"
 
 endmenu
-- 
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