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Revert "x86: Side-step lguest problem by only building cmpxchg8b_emu for pre-Pentium"

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commit db677ffa5f upstream.

This reverts commit ae1b22f6e4.

As Linus said in 982d007a6e: "There was something really messy about
cmpxchg8b and clone CPU's, so if you enable it on other CPUs later, do it
carefully."

This breaks lguest for those configs, but we can fix that by emulating
if we have to.

Fixes: http://bugzilla.kernel.org/show_bug.cgi?id=14884
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Rusty Russell
2010-01-05 12:48:49 +10:30
committed by Greg Kroah-Hartman
parent 24488113f0
commit b7e5f77916
1 changed files with 1 additions and 1 deletions
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arch/x86/Kconfig.cpu
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@@ -400,7 +400,7 @@ config X86_TSC
config X86_CMPXCHG64
def_bool y
depends on !M386 && !M486
depends on X86_PAE || X86_64 || MCORE2 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || MATOM
# this should be set for all -march=.. options where the compiler
# generates cmov.