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author | Christoph Lameter <cl@linux.com> | 2011-03-12 12:50:10 +0100 |
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committer | Tejun Heo <tj@kernel.org> | 2011-03-29 10:18:30 +0200 |
commit | 349c004e3d31fda23ad225b61861be38047fff16 (patch) | |
tree | 1600c1356f4b992d07e191492054619d03e7c9f7 /arch/x86/kernel/apic | |
parent | 89078d572eb9ce8d4c04264b8b0ba86de0d74c8f (diff) | |
download | kernel_samsung_smdk4412-349c004e3d31fda23ad225b61861be38047fff16.zip kernel_samsung_smdk4412-349c004e3d31fda23ad225b61861be38047fff16.tar.gz kernel_samsung_smdk4412-349c004e3d31fda23ad225b61861be38047fff16.tar.bz2 |
x86: A fast way to check capabilities of the current cpu
Add this_cpu_has() which determines if the current cpu has a certain
ability using a segment prefix and a bit test operation.
For that we need to add bit operations to x86s percpu.h.
Many uses of cpu_has use a pointer passed to a function to determine
the current flags. That is no longer necessary after this patch.
However, this patch only converts the straightforward cases where
cpu_has is used with this_cpu_ptr. The rest is work for later.
-tj: Rolled up patch to add x86_ prefix and use percpu_read() instead
of percpu_read_stable().
Signed-off-by: Christoph Lameter <cl@linux.com>
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Tejun Heo <tj@kernel.org>
Diffstat (limited to 'arch/x86/kernel/apic')
-rw-r--r-- | arch/x86/kernel/apic/apic.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c index fabf01e..2bc503b 100644 --- a/arch/x86/kernel/apic/apic.c +++ b/arch/x86/kernel/apic/apic.c @@ -505,7 +505,7 @@ static void __cpuinit setup_APIC_timer(void) { struct clock_event_device *levt = &__get_cpu_var(lapic_events); - if (cpu_has(__this_cpu_ptr(&cpu_info), X86_FEATURE_ARAT)) { + if (this_cpu_has(X86_FEATURE_ARAT)) { lapic_clockevent.features &= ~CLOCK_EVT_FEAT_C3STOP; /* Make LAPIC timer preferrable over percpu HPET */ lapic_clockevent.rating = 150; |