dect
/
linux-2.6
Archived
13
0
Fork 0
Code Releases Activity

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

This reverts commit ae1b22f6e4.

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.

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>
This commit is contained in:
Rusty Russell 2010-01-05 12:48:49 +10:30 committed by Linus Torvalds
parent 6307daad84
commit db677ffa5f
1 changed files with 1 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/x86/Kconfig.cpu
View File

@ -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.