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| author | Zhao Yakui <yakui.zhao@intel.com> | 2009-12-11 15:17:20 +0800 |
|---|---|---|
| committer | Len Brown <len.brown@intel.com> | 2009-12-14 21:54:30 -0500 |
| commit | 03a05ed1152944000151d57b71000de287a1eb02 (patch) | |
| tree | 8ff812b78a2395f66cfd5329f6a1b10e27860bc7 /arch | |
| parent | 22763c5cf3690a681551162c15d34d935308c8d7 (diff) | |
| download | linux-03a05ed1152944000151d57b71000de287a1eb02.tar.gz linux-03a05ed1152944000151d57b71000de287a1eb02.tar.bz2 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')
| -rw-r--r-- | arch/x86/kernel/acpi/cstate.c | 2 |
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); |