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(parent: 722154e) | patch
x86: Avoid check hlt for newer cpus
authorJacob Pan <jacob.jun.pan@linux.intel.com>
Fri, 7 May 2010 21:59:45 +0000 (14:59 -0700)
committerH. Peter Anvin <hpa@zytor.com>
Fri, 7 May 2010 22:31:17 +0000 (15:31 -0700)
commit2b107d93635616db0c3f893c8cc2e6d5cd8d77b2
treec0398294e48d974887552de739b8e0bdd343b794tree | snapshot
parent722154e4cacf015161efe60009ae9be23d492296commit | diff
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>
arch/x86/kernel/cpu/bugs.c diff | blob | history
Domain: System / Uncategorized;