[lkml]   [2013]   [Sep]   [20]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
Patch in this message
Subject[PATCH -v2] cpufreq: skip loading acpi_cpufreq after intel_pstate
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 <>

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;

 \ /
  Last update: 2013-09-20 20:01    [W:0.040 / U:14.368 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site