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-rw-r--r--drivers/acpi/acpi_pad.c13
1 files changed, 11 insertions, 2 deletions
diff --git a/drivers/acpi/acpi_pad.c b/drivers/acpi/acpi_pad.c
index 62122134693b..f169e516a1af 100644
--- a/drivers/acpi/acpi_pad.c
+++ b/drivers/acpi/acpi_pad.c
@@ -43,6 +43,10 @@ static DEFINE_MUTEX(isolated_cpus_lock);
43#define CPUID5_ECX_EXTENSIONS_SUPPORTED (0x1) 43#define CPUID5_ECX_EXTENSIONS_SUPPORTED (0x1)
44#define CPUID5_ECX_INTERRUPT_BREAK (0x2) 44#define CPUID5_ECX_INTERRUPT_BREAK (0x2)
45static unsigned long power_saving_mwait_eax; 45static unsigned long power_saving_mwait_eax;
46
47static unsigned char tsc_detected_unstable;
48static unsigned char tsc_marked_unstable;
49
46static void power_saving_mwait_init(void) 50static void power_saving_mwait_init(void)
47{ 51{
48 unsigned int eax, ebx, ecx, edx; 52 unsigned int eax, ebx, ecx, edx;
@@ -87,8 +91,8 @@ static void power_saving_mwait_init(void)
87 91
88 /*FALL THROUGH*/ 92 /*FALL THROUGH*/
89 default: 93 default:
90 /* TSC could halt in idle, so notify users */ 94 /* TSC could halt in idle */
91 mark_tsc_unstable("TSC halts in idle"); 95 tsc_detected_unstable = 1;
92 } 96 }
93#endif 97#endif
94} 98}
@@ -178,6 +182,11 @@ static int power_saving_thread(void *data)
178 expire_time = jiffies + HZ * (100 - idle_pct) / 100; 182 expire_time = jiffies + HZ * (100 - idle_pct) / 100;
179 183
180 while (!need_resched()) { 184 while (!need_resched()) {
185 if (tsc_detected_unstable && !tsc_marked_unstable) {
186 /* TSC could halt in idle, so notify users */
187 mark_tsc_unstable("TSC halts in idle");
188 tsc_marked_unstable = 1;
189 }
181 local_irq_disable(); 190 local_irq_disable();
182 cpu = smp_processor_id(); 191 cpu = smp_processor_id();
183 clockevents_notify(CLOCK_EVT_NOTIFY_BROADCAST_ENTER, 192 clockevents_notify(CLOCK_EVT_NOTIFY_BROADCAST_ENTER,