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authorZhao Yakui <yakui.zhao@intel.com>2009-12-11 15:17:20 +0800
committerLen Brown <len.brown@intel.com>2009-12-14 21:54:30 -0500
commit03a05ed1152944000151d57b71000de287a1eb02 (patch)
tree8ff812b78a2395f66cfd5329f6a1b10e27860bc7 /arch/x86/kernel/acpi/cstate.c
parent22763c5cf3690a681551162c15d34d935308c8d7 (diff)
downloadblackbird-op-linux-03a05ed1152944000151d57b71000de287a1eb02.tar.gz
blackbird-op-linux-03a05ed1152944000151d57b71000de287a1eb02.zip
ACPI: Use the ARB_DISABLE for the CPU which model id is less than 0x0f.
Currently, ARB_DISABLE is a NOP on all of the recent Intel platforms. For such platforms, reduce contention on c3_lock by skipping the fake ARB_DISABLE. The cpu model id on one laptop is 14. If we disable ARB_DISABLE on this box, the box can't be booted correctly. But if we still enable ARB_DISABLE on this box, the box can be booted correctly. So we still use the ARB_DISABLE for the cpu which mode id is less than 0x0f. http://bugzilla.kernel.org/show_bug.cgi?id=14700 Signed-off-by: Zhao Yakui <yakui.zhao@intel.com> Acked-by: Pallipadi, Venkatesh <venkatesh.pallipadi@intel.com> cc: stable@kernel.org Signed-off-by: Len Brown <len.brown@intel.com>
Diffstat (limited to 'arch/x86/kernel/acpi/cstate.c')
-rw-r--r--arch/x86/kernel/acpi/cstate.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/kernel/acpi/cstate.c b/arch/x86/kernel/acpi/cstate.c
index 59cdfa4686b2..2e837f5080fe 100644
--- a/arch/x86/kernel/acpi/cstate.c
+++ b/arch/x86/kernel/acpi/cstate.c
@@ -48,7 +48,7 @@ void acpi_processor_power_init_bm_check(struct acpi_processor_flags *flags,
* P4, Core and beyond CPUs
*/
if (c->x86_vendor == X86_VENDOR_INTEL &&
- (c->x86 > 0xf || (c->x86 == 6 && c->x86_model >= 14)))
+ (c->x86 > 0xf || (c->x86 == 6 && c->x86_model >= 0x0f)))
flags->bm_control = 0;
}
EXPORT_SYMBOL(acpi_processor_power_init_bm_check);
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