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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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