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@xxxxxxxxxx>
---
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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