Commit db677ffa authored Jan 05, 2010 by Rusty Russell Committed by Linus Torvalds Jan 05, 2010

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

This reverts commit ae1b22f6.

As Linus said in 982d007a: "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>
Cc: stable@kernel.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

parent 6307daad

arch/x86/Kconfig.cpu

+1 −1

Original line number	Diff line number	Diff line
		@@ -396,7 +396,7 @@ 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.

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