The patch titled
um: disable CONFIG_CMPXCHG_LOCAL
has been added to the -mm tree. Its filename is
um-disable-config_cmpxchg_local.patch
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------------------------------------------------------
Subject: um: disable CONFIG_CMPXCHG_LOCAL
From: Richard Weinberger <richard@xxxxxx>
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@xxxxxx>
Reported-by: Sergei Trofimovich <slyich@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/um/Kconfig.x86 | 4 ++++
1 file changed, 4 insertions(+)
diff -puN arch/um/Kconfig.x86~um-disable-config_cmpxchg_local arch/um/Kconfig.x86
--- a/arch/um/Kconfig.x86~um-disable-config_cmpxchg_local
+++ a/arch/um/Kconfig.x86
@@ -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
_
Patches currently in -mm which might be from richard@xxxxxx are
um-fix-call-tracer-and-bug-handler.patch
um-disable-config_cmpxchg_local.patch
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