Commit 084189a8 authored by Richard Weinberger's avatar Richard Weinberger Committed by Linus Torvalds

um: disable CONFIG_CMPXCHG_LOCAL

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: default avatarRichard Weinberger <richard@nod.at>
Reported-by: default avatarSergei Trofimovich <slyich@gmail.com>
Acked-by: default avatarPekka Enberg <penberg@kernel.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 6d56dad3
...@@ -4,6 +4,10 @@ menu "UML-specific options" ...@@ -4,6 +4,10 @@ menu "UML-specific options"
menu "Host processor type and features" menu "Host processor type and features"
config CMPXCHG_LOCAL
bool
default n
source "arch/x86/Kconfig.cpu" source "arch/x86/Kconfig.cpu"
endmenu endmenu
......
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