On 20 September 2013 10:56, Yinghai Lu <yinghai@xxxxxxxxxx> wrote:
> If the hw support intel_pstate and acpi_cpufreq, intel_pstate will
> get loaded at first.
s/at //
>
> acpi_cpufreq_init will call acpi_cpufreq_early_init()
> and it allocate perf data and init those perf data in ACPI core, (that
s/it /that will /
> will go over all cpus).
s/go over/cover/
> but late it will free them as cpufreq_register_driver(acpi_cpufreq) will
s/late/later
> return fail as init_pstate already take over before.
write it as: fail as intel_pstate is already registered.
> Use cpufreq_get_current_driver() to check if we can skip the
> acpi_cpufreq loading.
The below material looks to be a separate issue and so we
probably break this patch into two?
> Also there is racing in
> __acpi_processor_start
> ==> acpi_processor_load_module
> ==> request_module_nowait/requested = 1
> Index: linux-2.6/drivers/cpufreq/acpi-cpufreq.c
> ===================================================================
> --- linux-2.6.orig/drivers/cpufreq/acpi-cpufreq.c
> +++ linux-2.6/drivers/cpufreq/acpi-cpufreq.c
> @@ -986,6 +986,10 @@ static int __init acpi_cpufreq_init(void
> {
> int ret;
>
> + /* don't keep reloading if cpufreq_driver exists */
> + if (cpufreq_get_current_driver())
> + return 0;
> +
> if (acpi_disabled)
> return 0;
This looks fine to me..
> Index: linux-2.6/drivers/acpi/processor_perflib.c
> ===================================================================
> --- linux-2.6.orig/drivers/acpi/processor_perflib.c
> +++ linux-2.6/drivers/acpi/processor_perflib.c
Can't really review this one.. Rafael will do it..
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