lkml.org 
[lkml]   [2010]   [Jan]   [14]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    Patch in this message
    /
    From
    Subject[PATCH 06/52] Revert "x86: Side-step lguest problem by only building cmpxchg8b_emu for pre-Pentium"
    Date
    From: Rusty Russell <rusty@rustcorp.com.au>

    commit db677ffa5f5a4f15b9dad4d132b3477b80766d82 upstream.

    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.

    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>
    ---
    arch/x86/Kconfig.cpu | 2 +-
    1 files changed, 1 insertions(+), 1 deletions(-)

    diff --git a/arch/x86/Kconfig.cpu b/arch/x86/Kconfig.cpu
    index 2649840..f2824fb 100644
    --- a/arch/x86/Kconfig.cpu
    +++ b/arch/x86/Kconfig.cpu
    @@ -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.
    --
    1.6.6


    \
     
     \ /
      Last update: 2010-01-14 23:43    [W:2.921 / U:0.332 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site