um: disable CONFIG_CMPXCHG_LOCAL
authorRichard Weinberger <richard@nod.at>
Thu, 14 Apr 2011 22:22:18 +0000 (15:22 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Thu, 14 Apr 2011 23:06:56 +0000 (16:06 -0700)
Commit 8a5ec0ba "Lockless (and preemptless) fastpaths for slub" makes use
of this_cpu_cmpxchg_double() which needs this_cpu_cmpxchg16b_emu() on
x86_64.  Implementing cmpxchg16b emulation for UML would introduce too
much complexity.  So just disable it.

Signed-off-by: Richard Weinberger <richard@nod.at>
Reported-by: Sergei Trofimovich <slyich@gmail.com>
Acked-by: Pekka Enberg <penberg@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
arch/um/Kconfig.x86

index 02fb017fed472ed96d66aa1a4252b17b2f5bd677..a9da516a527416e12cfdc887939e2eb8cbd5020f 100644 (file)
@@ -4,6 +4,10 @@ menu "UML-specific options"
 
 menu "Host processor type and features"
 
+config CMPXCHG_LOCAL
+       bool
+       default n
+
 source "arch/x86/Kconfig.cpu"
 
 endmenu