Re: Linux ACPI processor driver patch: user-definable power state limit

[Len Brown <len.brown-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>]

Jos,
I agree with you that a single parameter is simpler.

Another thing we need to address -- with either scheme --
is that the parameter must be set in the kernel, not
in the processor modules.

This is because it is necessary for modules, such as ipw2100
to be able to disable c3 automatically when they detect
that it is interfering with their operation.

so we'd export a function from the base kernel for
modules to set the limit, and we'd simply export
the value of acpi_cstate_limit for processor.c
to observe at run-time.

int
acpi_set_cstate_limit(int limit)

int acpi_cstate_limit;

I think it can return the old limit so that
the caller can potentially un-do its call,
or perhaps setting the limit to 0 should
simply mean clear any limit.

cheers,
-Len




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