Messages in this thread |  | | Date | Fri, 20 Sep 2013 12:51:08 -0700 | Subject | Re: [PATCH -v2] cpufreq: skip loading acpi_cpufreq after intel_pstate | From | Yinghai Lu <> |
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On Fri, Sep 20, 2013 at 10:43 AM, Yinghai Lu <yinghai@kernel.org> wrote: > If the hw support intel_pstate and acpi_cpufreq, intel_pstate will > get loaded first. > > acpi_cpufreq_init will call acpi_cpufreq_early_init() > and that will allocate perf data and init those perf data in ACPI core, > (that will cover all cpus). But later it will free them as > cpufreq_register_driver(acpi_cpufreq) will fail as init_pstate is > already registered > > Use cpufreq_get_current_driver() to check if we can skip the > acpi_cpufreq loading. > > -v2: update changelog and separate second part to another patch, according > to Viresh. > > Signed-off-by: Yinghai Lu <yinghai@kernel.org> > > --- > drivers/cpufreq/acpi-cpufreq.c | 4 ++++ > 1 file changed, 4 insertions(+) > > 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; >
only this one is needed, other one
cpufreq: fix racing between acpi_cpufreq_loading
is not needed.
Thanks
Yinghai
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