Re: [PATCH] ACPI: do not mark TSC unstable for invalid C-states

[Frans Pop]

On Monday 11 May 2009, Thomas Gleixner wrote:
> commit a71e4917dc0ebbcb5a0ecb7ca3486643c1c9a6e2 (ACPI: idle:
> mark_tsc_unstable() at init-time, not run-time) marks TSC unstable
> even on non affected systems.
>
> The reason is that the state enumeration does not check the cx->valid
> flag before calling tsc_halts_in_c(), so it marks TSC unstable for any
> enumerated albeit invalid C state which is known to turn off TSC.
>
> Check cx->valid before checking whether the TSC might become unstable.
>
> Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>

Tested-by: Frans Pop <elendil@xxxxxxxxx>

Thanks Thomas.
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