Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris...

[pandora-kernel.git] / arch / x86_64 / kernel / tsc.c

diff --git a/arch/x86_64/kernel/tsc.c b/arch/x86_64/kernel/tsc.c
index 8958318..e850aa0 100644 (file)
--- a/arch/x86_64/kernel/tsc.c
+++ b/arch/x86_64/kernel/tsc.c
@@ -13,6 +13,8 @@ static int notsc __initdata = 0;
 
 unsigned int cpu_khz;          /* TSC clocks / usec, not used here */
 EXPORT_SYMBOL(cpu_khz);
+unsigned int tsc_khz;
+EXPORT_SYMBOL(tsc_khz);
 
 static unsigned int cyc2ns_scale __read_mostly;
 
@@ -42,7 +44,7 @@ unsigned long long sched_clock(void)
 
 static int tsc_unstable;
 
-static inline int check_tsc_unstable(void)
+inline int check_tsc_unstable(void)
 {
        return tsc_unstable;
 }
@@ -77,7 +79,7 @@ static void handle_cpufreq_delayed_get(struct work_struct *v)
 static unsigned int  ref_freq = 0;
 static unsigned long loops_per_jiffy_ref = 0;
 
-static unsigned long cpu_khz_ref = 0;
+static unsigned long tsc_khz_ref = 0;
 
 static int time_cpufreq_notifier(struct notifier_block *nb, unsigned long val,
                                 void *data)
@@ -99,7 +101,7 @@ static int time_cpufreq_notifier(struct notifier_block *nb, unsigned long val,
        if (!ref_freq) {
                ref_freq = freq->old;
                loops_per_jiffy_ref = *lpj;
-               cpu_khz_ref = cpu_khz;
+               tsc_khz_ref = tsc_khz;
        }
        if ((val == CPUFREQ_PRECHANGE  && freq->old < freq->new) ||
                (val == CPUFREQ_POSTCHANGE && freq->old > freq->new) ||
@@ -107,12 +109,12 @@ static int time_cpufreq_notifier(struct notifier_block *nb, unsigned long val,
                *lpj =
                cpufreq_scale(loops_per_jiffy_ref, ref_freq, freq->new);
 
-               cpu_khz = cpufreq_scale(cpu_khz_ref, ref_freq, freq->new);
+               tsc_khz = cpufreq_scale(tsc_khz_ref, ref_freq, freq->new);
                if (!(freq->flags & CPUFREQ_CONST_LOOPS))
-                       mark_tsc_unstable();
+                       mark_tsc_unstable("cpufreq changes");
        }
 
-       set_cyc2ns_scale(cpu_khz_ref);
+       set_cyc2ns_scale(tsc_khz_ref);
 
        return 0;
 }
@@ -197,10 +199,11 @@ static struct clocksource clocksource_tsc = {
        .vread                  = vread_tsc,
 };
 
-void mark_tsc_unstable(void)
+void mark_tsc_unstable(char *reason)
 {
        if (!tsc_unstable) {
                tsc_unstable = 1;
+               printk("Marking TSC unstable due to %s\n", reason);
                /* Change only the rating, when not registered */
                if (clocksource_tsc.mult)
                        clocksource_change_rating(&clocksource_tsc, 0);
@@ -210,17 +213,14 @@ void mark_tsc_unstable(void)
 }
 EXPORT_SYMBOL_GPL(mark_tsc_unstable);
 
-static int __init init_tsc_clocksource(void)
+void __init init_tsc_clocksource(void)
 {
        if (!notsc) {
-               clocksource_tsc.mult = clocksource_khz2mult(cpu_khz,
+               clocksource_tsc.mult = clocksource_khz2mult(tsc_khz,
                                                        clocksource_tsc.shift);
                if (check_tsc_unstable())
                        clocksource_tsc.rating = 0;
 
-               return clocksource_register(&clocksource_tsc);
+               clocksource_register(&clocksource_tsc);
        }
-       return 0;
 }
-
-module_init(init_tsc_clocksource);