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um: disable CONFIG_CMPXCHG_LOCAL

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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>
This commit is contained in:
Richard Weinberger 2011-04-14 15:22:18 -07:00 committed by Linus Torvalds
parent 6d56dad3ae
commit 084189a887
1 changed files with 4 additions and 0 deletions
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4
arch/um/Kconfig.x86
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@ -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