um: disable CMPXCHG_DOUBLE as it breaks UML build
authorThadeu Lima de Souza Cascardo <cascardo@holoscopio.com>
Wed, 14 Sep 2011 23:21:08 +0000 (16:21 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Thu, 15 Sep 2011 01:09:37 +0000 (18:09 -0700)
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

index d31ecf346b4eced920a6e648b50e3eb2c08efb29..21bebe63df6660d08e0bd50ac6b8cb2486b76355 100644 (file)
@@ -10,6 +10,10 @@ config CMPXCHG_LOCAL
        bool
        default n
 
+config CMPXCHG_DOUBLE
+       bool
+       default n
+
 source "arch/x86/Kconfig.cpu"
 
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