Re: [v9 PATCH 4/9]: x86: refactor x86 idle power management code and remove all instances of pm_idle.

Pavel Machek
2009-10-23T16:07:11Z

On Fri 2009-10-16 15:13:08, Arun R Bharadwaj wrote:
> * Arun R Bharadwaj <arun@linux.vnet.ibm.com> [2009-10-16 15:08:50]:
>
> This patch cleans up x86 of all instances of pm_idle.
>
> pm_idle which was earlier called from cpu_idle() idle loop
> is replaced by cpuidle_idle_call.
>
> x86 also registers to cpuidle when the idle routine is selected,
> by populating the cpuidle_device data structure for each cpu.
>
> This is replicated for apm module and for xen, which also used pm_idle.
>
>
> Signed-off-by: Arun R Bharadwaj <arun@linux.vnet.ibm.com>
> ---
> arch/x86/kernel/apm_32.c | 55 ++++++++++++++++++++++++-
> arch/x86/kernel/process.c | 90 ++++++++++++++++++++++++++++++++----------
> arch/x86/kernel/process_32.c | 3 -
> arch/x86/kernel/process_64.c | 3 -
> arch/x86/xen/setup.c | 40 ++++++++++++++++++
> drivers/acpi/processor_core.c | 9 ++--
> drivers/cpuidle/cpuidle.c | 16 +++++--
> 7 files changed, 182 insertions(+), 34 deletions(-)
...
> +static int local_idle_loop(struct cpuidle_device *dev, struct cpuidle_state *st)
> +{
> + ktime_t t1, t2;
> + s64 diff;
> + int ret;
> +
> + t1 = ktime_get();
> + local_idle();
> + t2 = ktime_get();
> +
> + diff = ktime_to_us(ktime_sub(t2, t1));
> + if (diff > INT_MAX)
> + diff = INT_MAX;
> + ret = (int) diff;
> +
> + return ret;
> +}

So we get this routine essentially 3 times. Is there no way to share
the code?

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