[PATCH] powerpc: Enable generic cpu idle-loop

Michael Ellerman mpe at ellerman.id.au
Fri Aug 18 21:18:24 AEST 2023

Vaibhav Jain <vaibhav at linux.ibm.com> writes:
> This minor patch enables config option GENERIC_IDLE_POLL_SETUP for arch
> powerpc. This should add support for kernel param 'nohlt'.

Which is named after an 8086 instruction :), but oh well.

> Powerpc kernel also supports another kernel boot-time param called
> 'powersave' which can also be used to disable all cpu idle-states and
> forces CPU to an idle-loop similar to what cpu_idle_poll() does. This
> patch however makes powerpc kernel-parameters better aligned to the
> generic boot-time parameters.

It would be nice if we could make our powersave=off parameter just
enable this generic logic.

Have you looked at if that's possible? At a glance it looks like it
should be, when cpu_idle_force_poll is true do_idle() never calls
cpuidle_idle_call(), so the cpuidle drivers are never invoked.


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