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| author | Jacob Pan <jacob.jun.pan@linux.intel.com> | 2010-05-07 14:59:45 -0700 |
|---|---|---|
| committer | H. Peter Anvin <hpa@zytor.com> | 2010-05-07 15:31:17 -0700 |
| commit | 2b107d93635616db0c3f893c8cc2e6d5cd8d77b2 (patch) | |
| tree | c0398294e48d974887552de739b8e0bdd343b794 | |
| parent | 722154e4cacf015161efe60009ae9be23d492296 (diff) | |
| download | linux-2b107d93635616db0c3f893c8cc2e6d5cd8d77b2.tar.gz linux-2b107d93635616db0c3f893c8cc2e6d5cd8d77b2.tar.bz2 linux-2b107d93635616db0c3f893c8cc2e6d5cd8d77b2.zip | |
x86: Avoid check hlt for newer cpus
Check hlt instruction was targeted for some older CPUs. It is an expensive
operation in that it takes 4 ticks to break out the check. We can avoid
such check completely for newer x86 cpus (family >= 5).
[ hpa: corrected family > 5 to family >= 5 ]
Signed-off-by: Jacob Pan <jacob.jun.pan@linux.intel.com>
LKML-Reference: <1273269585-14346-1-git-send-email-jacob.jun.pan@linux.intel.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
| -rw-r--r-- | arch/x86/kernel/cpu/bugs.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/kernel/cpu/bugs.c b/arch/x86/kernel/cpu/bugs.c index 01a265212395..c39576cb3018 100644 --- a/arch/x86/kernel/cpu/bugs.c +++ b/arch/x86/kernel/cpu/bugs.c @@ -86,7 +86,7 @@ static void __init check_fpu(void) static void __init check_hlt(void) { - if (paravirt_enabled()) + if (boot_cpu_data.x86 >= 5 || paravirt_enabled()) return; printk(KERN_INFO "Checking 'hlt' instruction... "); |