diff options
Diffstat (limited to 'arch/x86/kernel/time_64.c')
| -rw-r--r-- | arch/x86/kernel/time_64.c | 26 |
1 files changed, 20 insertions, 6 deletions
diff --git a/arch/x86/kernel/time_64.c b/arch/x86/kernel/time_64.c index 39ae8511a13..c6ac4dad41f 100644 --- a/arch/x86/kernel/time_64.c +++ b/arch/x86/kernel/time_64.c @@ -56,7 +56,7 @@ static irqreturn_t timer_event_interrupt(int irq, void *dev_id) /* calibrate_cpu is used on systems with fixed rate TSCs to determine * processor frequency */ #define TICK_COUNT 100000000 -unsigned long __init native_calculate_cpu_khz(void) +static unsigned long __init calibrate_cpu(void) { int tsc_start, tsc_now; int i, no_ctr_free; @@ -114,14 +114,18 @@ void __init hpet_time_init(void) setup_irq(0, &irq0); } +extern void set_cyc2ns_scale(unsigned long cpu_khz, int cpu); + void __init time_init(void) { - tsc_calibrate(); + int cpu; + + cpu_khz = calculate_cpu_khz(); + tsc_khz = cpu_khz; - cpu_khz = tsc_khz; if (cpu_has(&boot_cpu_data, X86_FEATURE_CONSTANT_TSC) && - (boot_cpu_data.x86_vendor == X86_VENDOR_AMD)) - cpu_khz = calculate_cpu_khz(); + (boot_cpu_data.x86_vendor == X86_VENDOR_AMD)) + cpu_khz = calibrate_cpu(); lpj_fine = ((unsigned long)tsc_khz * 1000)/HZ; @@ -134,7 +138,17 @@ void __init time_init(void) vgetcpu_mode = VGETCPU_LSL; printk(KERN_INFO "time.c: Detected %d.%03d MHz processor.\n", - cpu_khz / 1000, cpu_khz % 1000); + cpu_khz / 1000, cpu_khz % 1000); + + /* + * Secondary CPUs do not run through tsc_init(), so set up + * all the scale factors for all CPUs, assuming the same + * speed as the bootup CPU. (cpufreq notifiers will fix this + * up if their speed diverges) + */ + for_each_possible_cpu(cpu) + set_cyc2ns_scale(cpu_khz, cpu); + init_tsc_clocksource(); late_time_init = choose_time_init(); } |