Re: [PATCH v2] cpuidle-pseries: Fix CEDE latency conversion from tb to us

From: Michael Ellerman
Date: Thu Sep 10 2020 - 17:44:35 EST

On Thu, 3 Sep 2020 14:57:27 +0530, Gautham R. Shenoy wrote:
> commit d947fb4c965c ("cpuidle: pseries: Fixup exit latency for
> CEDE(0)") sets the exit latency of CEDE(0) based on the latency values
> of the Extended CEDE states advertised by the platform. The values
> advertised by the platform are in timebase ticks. However the cpuidle
> framework requires the latency values in microseconds.
> If the tb-ticks value advertised by the platform correspond to a value
> smaller than 1us, during the conversion from tb-ticks to microseconds,
> in the current code, the result becomes zero. This is incorrect as it
> puts a CEDE state on par with the snooze state.
> [...]

Applied to powerpc/fixes.

[1/1] cpuidle: pseries: Fix CEDE latency conversion from tb to us