提交 084189a8 编写于 作者: R Richard Weinberger 提交者: 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: NRichard Weinberger <richard@nod.at>
Reported-by: NSergei Trofimovich <slyich@gmail.com>
Acked-by: NPekka Enberg <penberg@kernel.org>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
上级 6d56dad3
......@@ -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
......
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