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>
diff --git a/arch/x86/kernel/cpu/bugs.c b/arch/x86/kernel/cpu/bugs.c
index 01a2652..c39576c 100644
--- a/arch/x86/kernel/cpu/bugs.c
+++ b/arch/x86/kernel/cpu/bugs.c
@@ -86,7 +86,7 @@
static void __init check_hlt(void)
{
- if (paravirt_enabled())
+ if (boot_cpu_data.x86 >= 5 || paravirt_enabled())
return;
printk(KERN_INFO "Checking 'hlt' instruction... ");