Messages in this thread Patch in this message | | | From | Yinghai Lu <> | Subject | [PATCH -v2] cpufreq: skip loading acpi_cpufreq after intel_pstate | Date | Fri, 20 Sep 2013 10:43:56 -0700 |
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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;
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