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SubjectRe: [linux-pm] [PATCH 0/9] x86 idle cruft removal - v2
> 2.6.39-rc1
> ----------
>
> x86 idle: deprecate floppy disable_hlt
> feature-removal.txt for 2.6.40 (4 months)
> WARN_ONCE on use
> cc: stable@kernel.org
>
> x86 idle APM: deprecate apm_cpu_idle
> feature-removal.txt for 2.6.40 (4 months)
> #warning on CONFIG_APM_CPU_IDLE remove in 2.6.40
> WARN_ONCE in apm_cpu_idle()
> cc: stable@kernel.org
>
> x86 idle: export pm_idle only for CONFIG_APM_MODULE
> like we do for default_idle(),
> EXPORT_SYMBOL(pm_idle) only on CONFIG_APM_MODULE
>
> x86 idle: deprecate "no-hlt" cmdline param
> feature-removal.txt for 2.6.40 (4 months)
> cc stable@kernel.org
> WARN_ONCE if used, ask if idle=poll is sufficient
> same as idle=poll, except no-hlt also disables
> HLT in machine_halt().
>
> x86 idle: deprecate "idle=mwait"
> feature-removal.txt for 2.6.40 (4 months)
> cc stable@kernel.org
> WARN_ONCE on invocation
>
> x86 idle: re-name ce1_idle
> rename for clarity, no functional change
>
> 2.6.40-merge
> ------
> x86 idle: move mwait_idle_with_hints()
> out of process.c to cstate.c, make static
>
> x86 idle floppy: remove deprecated disable_hlt/enable_hlt
>
> x86 idle: delete deprecated idle=mwait
> default_idle() can use HLT
>
> cpuidle: add cmdline "cpuidle=off"
> allow falling back to native default_idle
>
> x86 idle xen: stop touching pm_idle and default_idle
> Xen Dom0 kernel only needs HLT, but include
> CPU_IDLE, ACPI etc for running on bare hardware.
> So when running in Xen Dom0 mode, disable cpuidle
> to fall back to default_idle.
>
> x86 idle APM: remove deprecated apm_cpu_idle()
> and its use of pm_idle
>
> x86 idle cpuidle: delete public use of pm_idle
> make pm_idle and default_idle static to process.c

Hi Len,

I guess this would eliminate the problems caused by pm_idle.
In that case I also think we need not implement a default
driver (like the one I had done https://lkml.org/lkml/2011/3/22/154)
to handle the case when acpi_idle and intel_idle may not register.

Additionally, we may not need to support multiple cpuidle driver
registration as now there would be only acpi_idle and intel_idle
and mechanism already exists to select between the two.

Thanks,
-Trinabh

> add return value from cpu_idle_call()
> invoke cpu_idle_call from cpu_idle() rather than via pm_idle
>
> cpu_idle() {
> ...
> if (cpu_idle_call())
> pm_idle(); /* non cpuidle default */
> }
>


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