Revert "x86: Side-step lguest problem by only building cmpxchg8b_emu for pre-Pentium"
PATCH 1/1 Revert "x86: Side-step lguest problem by only building cmpxchg8b_emu for pre-Pentium"
This reverts commit ae1b22f6e46c03cede7cea234d0bf2253b4261cf.
As Linus said in 982d007a6ee: "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.
--- arch/x86/Kconfig.cpu | 2 +- 1 files changed, 1 insertions(+), 1 deletions(-)
arch/x86/Kconfig.cpu +1 -1
@@ -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.
Commit-ID: f4b825bde98938f160315d655597bc9731521cae Gitweb: http://git.kernel.org/tip/f4b825bde98938f160315d655597bc9731521cae Author: Rusty Russell <[email protected]> AuthorDate: Tue, 5 Jan 2010 12:48:49 +1030 Committer: H. Peter Anvin <[email protected]> CommitDate: Mon, 4 Jan 2010 19:35:49 -0800
Revert "x86: Side-step lguest problem by only building cmpxchg8b_emu for pre-Pentium"
This reverts commit ae1b22f6e46c03cede7cea234d0bf2253b4261cf.
As Linus said in 982d007a6ee: "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.
LKML-Reference: <[email protected]>
--- arch/x86/Kconfig.cpu | 2 +- 1 files changed, 1 insertions(+), 1 deletions(-)
arch/x86/Kconfig.cpu +1 -1
@@ -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.