ACPI: Don't let acpi_pad needlessly mark TSC unstable

acpi pad driver kind of aggressively marks TSC as unstable at init
time, on mwait capable and non X86_FEATURE_NONSTOP_TSC systems. This is
irrespective of whether pad driver is ever going to be used on the
system or deep C-states are supported/used. This will affect every user
who just happens to compile in (or get a kernel version which
compiles in) acpi pad driver.

Move mark_tsc_unstable() out of init to the actual idle invocation path
of the pad driver.

There is also another bug/missing_feature in the code that it does not
support 'always running apic timer' and switches to broadcast mode
unconditionally. Shaohua, can you take a look at that please.

Signed-off-by: Venkatesh Pallipadi <venki@google.com>
Signed-off-by: Len Brown <len.brown@intel.com>

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);
 #define CPUID5_ECX_EXTENSIONS_SUPPORTED (0x1)
 #define CPUID5_ECX_INTERRUPT_BREAK      (0x2)
 static unsigned long power_saving_mwait_eax;
+
+static unsigned char tsc_detected_unstable;
+static unsigned char tsc_marked_unstable;
+
 static void power_saving_mwait_init(void)
 {
         unsigned int eax, ebx, ecx, edx;
@@ -87,8 +91,8 @@ static void power_saving_mwait_init(void)
 
                 /*FALL THROUGH*/
         default:
-                /* TSC could halt in idle, so notify users */
-                mark_tsc_unstable("TSC halts in idle");
+                /* TSC could halt in idle */
+                tsc_detected_unstable = 1;
         }
 #endif
 }
@@ -178,6 +182,11 @@ static int power_saving_thread(void *data)
                 expire_time = jiffies + HZ * (100 - idle_pct) / 100;
 
                 while (!need_resched()) {
+                        if (tsc_detected_unstable && !tsc_marked_unstable) {
+                                /* TSC could halt in idle, so notify users */
+                                mark_tsc_unstable("TSC halts in idle");
+                                tsc_marked_unstable = 1;
+                        }
                         local_irq_disable();
                         cpu = smp_processor_id();
                         clockevents_notify(CLOCK_EVT_NOTIFY_BROADCAST_ENTER,