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x86: Fix keeping track of AMD C1E

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Accomodate the original C1E-aware idle routine to the different times
during boot when the BIOS enables C1E. While at it, remove the synthetic
CPUID flag in favor of a single global setting which denotes C1E status
on the system.

[ hpa: changed c1e_enabled to be a bool; clarified cpu bit 3:21 comment ]

Signed-off-by: Michal Schmidt <mschmidt@redhat.com>
LKML-Reference: <20100727165335.GA11630@aftab>
Signed-off-by: Borislav Petkov <borislav.petkov@amd.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Michal Schmidt
2010-07-27 18:53:35 +02:00
committed by H. Peter Anvin
parent 9792db6174
commit e8c534ec06
5 changed files with 9 additions and 6 deletions
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arch/x86/include/asm/acpi.h
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@@ -134,7 +134,7 @@ static inline unsigned int acpi_processor_cstate_check(unsigned int max_cstate)
boot_cpu_data.x86_model <= 0x05 &&
boot_cpu_data.x86_mask < 0x0A)
return 1;
else if (boot_cpu_has(X86_FEATURE_AMDC1E))
else if (c1e_detected)
return 1;
else
return max_cstate;