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Diffstat (limited to 'arch/x86/kernel/tsc.c')
-rw-r--r--arch/x86/kernel/tsc.c14
1 files changed, 6 insertions, 8 deletions
diff --git a/arch/x86/kernel/tsc.c b/arch/x86/kernel/tsc.c
index d5cebb52d45..7a567ebe636 100644
--- a/arch/x86/kernel/tsc.c
+++ b/arch/x86/kernel/tsc.c
@@ -17,20 +17,21 @@
#include <asm/delay.h>
#include <asm/hypervisor.h>
-unsigned int cpu_khz; /* TSC clocks / usec, not used here */
+unsigned int __read_mostly cpu_khz; /* TSC clocks / usec, not used here */
EXPORT_SYMBOL(cpu_khz);
-unsigned int tsc_khz;
+
+unsigned int __read_mostly tsc_khz;
EXPORT_SYMBOL(tsc_khz);
/*
* TSC can be unstable due to cpufreq or due to unsynced TSCs
*/
-static int tsc_unstable;
+static int __read_mostly tsc_unstable;
/* native_sched_clock() is called before tsc_init(), so
we must start with the TSC soft disabled to prevent
erroneous rdtsc usage on !cpu_has_tsc processors */
-static int tsc_disabled = -1;
+static int __read_mostly tsc_disabled = -1;
static int tsc_clocksource_reliable;
/*
@@ -543,8 +544,6 @@ unsigned long native_calibrate_tsc(void)
return tsc_pit_min;
}
-#ifdef CONFIG_X86_32
-/* Only called from the Powernow K7 cpu freq driver */
int recalibrate_cpu_khz(void)
{
#ifndef CONFIG_SMP
@@ -566,7 +565,6 @@ int recalibrate_cpu_khz(void)
EXPORT_SYMBOL(recalibrate_cpu_khz);
-#endif /* CONFIG_X86_32 */
/* Accelerators for sched_clock()
* convert from cycles(64bits) => nanoseconds (64bits)
@@ -793,7 +791,7 @@ __cpuinit int unsynchronized_tsc(void)
if (!cpu_has_tsc || tsc_unstable)
return 1;
-#ifdef CONFIG_X86_SMP
+#ifdef CONFIG_SMP
if (apic_is_clustered_box())
return 1;
#endif