2 files changed, 28 insertions, 17 deletions

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 81732b8abd3a..7310b08bee5e 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -1158,6 +1158,8 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
         inport.irq=     [HW] Inport (ATI XL and Microsoft) busmouse driver
                         Format: <irq>
 
+        int_pln_enable  [x86] Enable power limit notification interrupt
+
         intel_iommu=    [DMAR] Intel IOMMU driver (DMAR) option
                 on
                         Enable intel iommu driver.
diff --git a/arch/x86/kernel/cpu/mcheck/therm_throt.c b/arch/x86/kernel/cpu/mcheck/therm_throt.c
index 2f3a7995e56a..98f2083832eb 100644
--- a/arch/x86/kernel/cpu/mcheck/therm_throt.c
+++ b/arch/x86/kernel/cpu/mcheck/therm_throt.c
@@ -182,11 +182,6 @@ static int therm_throt_process(bool new_event, int event, int level)
                                 this_cpu,
                                 level == CORE_LEVEL ? "Core" : "Package",
                                 state->count);
-                else
-                        printk(KERN_CRIT "CPU%d: %s power limit notification (total events = %lu)\n",
-                                this_cpu,
-                                level == CORE_LEVEL ? "Core" : "Package",
-                                state->count);
                 return 1;
         }
         if (old_event) {
@@ -194,10 +189,6 @@ static int therm_throt_process(bool new_event, int event, int level)
                         printk(KERN_INFO "CPU%d: %s temperature/speed normal\n",
                                 this_cpu,
                                 level == CORE_LEVEL ? "Core" : "Package");
-                else
-                        printk(KERN_INFO "CPU%d: %s power limit normal\n",
-                                this_cpu,
-                                level == CORE_LEVEL ? "Core" : "Package");
                 return 1;
         }
 
@@ -220,6 +211,15 @@ static int thresh_event_valid(int event)
         return 1;
 }
 
+static bool int_pln_enable;
+static int __init int_pln_enable_setup(char *s)
+{
+        int_pln_enable = true;
+
+        return 1;
+}
+__setup("int_pln_enable", int_pln_enable_setup);
+
 #ifdef CONFIG_SYSFS
 /* Add/Remove thermal_throttle interface for CPU device: */
 static __cpuinit int thermal_throttle_add_dev(struct device *dev,
@@ -232,7 +232,7 @@ static __cpuinit int thermal_throttle_add_dev(struct device *dev,
         if (err)
                 return err;
 
-        if (cpu_has(c, X86_FEATURE_PLN))
+        if (cpu_has(c, X86_FEATURE_PLN) && int_pln_enable)
                 err = sysfs_add_file_to_group(&dev->kobj,
                                               &dev_attr_core_power_limit_count.attr,
                                               thermal_attr_group.name);
@@ -240,7 +240,7 @@ static __cpuinit int thermal_throttle_add_dev(struct device *dev,
                 err = sysfs_add_file_to_group(&dev->kobj,
                                               &dev_attr_package_throttle_count.attr,
                                               thermal_attr_group.name);
-                if (cpu_has(c, X86_FEATURE_PLN))
+                if (cpu_has(c, X86_FEATURE_PLN) && int_pln_enable)
                         err = sysfs_add_file_to_group(&dev->kobj,
                                         &dev_attr_package_power_limit_count.attr,
                                         thermal_attr_group.name);
@@ -353,7 +353,7 @@ static void intel_thermal_interrupt(void)
                                 CORE_LEVEL) != 0)
                 mce_log_therm_throt_event(msr_val);
 
-        if (this_cpu_has(X86_FEATURE_PLN))
+        if (this_cpu_has(X86_FEATURE_PLN) && int_pln_enable)
                 therm_throt_process(msr_val & THERM_STATUS_POWER_LIMIT,
                                         POWER_LIMIT_EVENT,
                                         CORE_LEVEL);
@@ -363,7 +363,7 @@ static void intel_thermal_interrupt(void)
                 therm_throt_process(msr_val & PACKAGE_THERM_STATUS_PROCHOT,
                                         THERMAL_THROTTLING_EVENT,
                                         PACKAGE_LEVEL);
-                if (this_cpu_has(X86_FEATURE_PLN))
+                if (this_cpu_has(X86_FEATURE_PLN) && int_pln_enable)
                         therm_throt_process(msr_val &
                                         PACKAGE_THERM_STATUS_POWER_LIMIT,
                                         POWER_LIMIT_EVENT,
@@ -482,9 +482,13 @@ void intel_init_thermal(struct cpuinfo_x86 *c)
         apic_write(APIC_LVTTHMR, h);
 
         rdmsr(MSR_IA32_THERM_INTERRUPT, l, h);
-        if (cpu_has(c, X86_FEATURE_PLN))
+        if (cpu_has(c, X86_FEATURE_PLN) && !int_pln_enable)
                 wrmsr(MSR_IA32_THERM_INTERRUPT,
-                      l | (THERM_INT_LOW_ENABLE
+                        (l | (THERM_INT_LOW_ENABLE
+                        | THERM_INT_HIGH_ENABLE)) & ~THERM_INT_PLN_ENABLE, h);
+        else if (cpu_has(c, X86_FEATURE_PLN) && int_pln_enable)
+                wrmsr(MSR_IA32_THERM_INTERRUPT,
+                        l | (THERM_INT_LOW_ENABLE
                         | THERM_INT_HIGH_ENABLE | THERM_INT_PLN_ENABLE), h);
         else
                 wrmsr(MSR_IA32_THERM_INTERRUPT,
@@ -492,9 +496,14 @@ void intel_init_thermal(struct cpuinfo_x86 *c)
 
         if (cpu_has(c, X86_FEATURE_PTS)) {
                 rdmsr(MSR_IA32_PACKAGE_THERM_INTERRUPT, l, h);
-                if (cpu_has(c, X86_FEATURE_PLN))
+                if (cpu_has(c, X86_FEATURE_PLN) && !int_pln_enable)
                         wrmsr(MSR_IA32_PACKAGE_THERM_INTERRUPT,
-                              l | (PACKAGE_THERM_INT_LOW_ENABLE
+                                (l | (PACKAGE_THERM_INT_LOW_ENABLE
+                                | PACKAGE_THERM_INT_HIGH_ENABLE))
+                                & ~PACKAGE_THERM_INT_PLN_ENABLE, h);
+                else if (cpu_has(c, X86_FEATURE_PLN) && int_pln_enable)
+                        wrmsr(MSR_IA32_PACKAGE_THERM_INTERRUPT,
+                                l | (PACKAGE_THERM_INT_LOW_ENABLE
                                 | PACKAGE_THERM_INT_HIGH_ENABLE
                                 | PACKAGE_THERM_INT_PLN_ENABLE), h);
                 else