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SubjectRe: [PATCH 41/61] x86-64: Fix C3 timer test
Date
Acked-by: Len Brown <len.brown@intel.com>

On Wednesday 01 November 2006 00:34, Chris Wright wrote:
> -stable review patch. If anyone has any objections, please let us know.
> ------------------
>
> From: Andi Kleen <ak@suse.de>
>
> There was a typo in the C3 latency test to decide of the TSC
> should be used or not. It used the C2 latency threshold, not the
> C3 one. Fix that.
>
> This should fix the time on various dual core laptops.
>
> Signed-off-by: Andi Kleen <ak@suse.de>
> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
> Signed-off-by: Chris Wright <chrisw@sous-sol.org>
>
> ---
> arch/x86_64/kernel/time.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> --- linux-2.6.18.1.orig/arch/x86_64/kernel/time.c
> +++ linux-2.6.18.1/arch/x86_64/kernel/time.c
> @@ -960,7 +960,7 @@ __cpuinit int unsynchronized_tsc(void)
> if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL) {
> #ifdef CONFIG_ACPI
> /* But TSC doesn't tick in C3 so don't use it there */
> - if (acpi_fadt.length > 0 && acpi_fadt.plvl3_lat < 100)
> + if (acpi_fadt.length > 0 && acpi_fadt.plvl3_lat < 1000)
> return 1;
> #endif
> return 0;
>
> --
> -
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