Merge branches 'release' and 'ppc-workaround' into release

1 files changed, 15 insertions, 1 deletions

diff --git a/drivers/acpi/processor_perflib.c b/drivers/acpi/processor_perflib.c
index 463b0247cbc5..f32010bee4d5 100644
--- a/drivers/acpi/processor_perflib.c
+++ b/drivers/acpi/processor_perflib.c
@@ -60,6 +60,11 @@ static DEFINE_MUTEX(performance_mutex);
  * policy is adjusted accordingly.
  */
 
+static unsigned int ignore_ppc = 0;
+module_param(ignore_ppc, uint, 0644);
+MODULE_PARM_DESC(ignore_ppc, "If the frequency of your machine gets wrongly" \
+                 "limited by BIOS, this should help");
+
 #define PPC_REGISTERED   1
 #define PPC_IN_USE       2
 
@@ -72,6 +77,9 @@ static int acpi_processor_ppc_notifier(struct notifier_block *nb,
         struct acpi_processor *pr;
         unsigned int ppc = 0;
 
+        if (ignore_ppc)
+                return 0;
+
         mutex_lock(&performance_mutex);
 
         if (event != CPUFREQ_INCOMPATIBLE)
@@ -130,7 +138,13 @@ static int acpi_processor_get_platform_limit(struct acpi_processor *pr)
 
 int acpi_processor_ppc_has_changed(struct acpi_processor *pr)
 {
-        int ret = acpi_processor_get_platform_limit(pr);
+        int ret;
+
+        if (ignore_ppc)
+                return 0;
+
+        ret = acpi_processor_get_platform_limit(pr);
+
         if (ret < 0)
                 return (ret);
         else