[PATCH 2/9] x86,tsc: Feed refined TSC calibration into sched_clock

[Peter Zijlstra]

For the (older) CPUs that still need the refined TSC calibration, also
update the sched_clock rate.

Signed-off-by: Peter Zijlstra (Intel) <pet...@infradead.org>
---
 arch/x86/kernel/tsc.c |    5 +++++
 1 file changed, 5 insertions(+)

--- a/arch/x86/kernel/tsc.c
+++ b/arch/x86/kernel/tsc.c
@@ -1267,6 +1267,7 @@ static void tsc_refine_calibration_work(
        static int hpet;
        u64 tsc_stop, ref_stop, delta;
        unsigned long freq;
+       int cpu;
 
        /* Don't bother refining TSC on unstable systems */
        if (check_tsc_unstable())
@@ -1317,6 +1318,10 @@ static void tsc_refine_calibration_work(
        /* Inform the TSC deadline clockevent devices about the recalibration */
        lapic_update_tsc_freq();
 
+       /* Update the sched_clock() rate to match the clocksource one */
+       for_each_possible_cpu(cpu)
+               set_cyc2ns_scale(tsc_khz, cpu);
+
 out:
        if (boot_cpu_has(X86_FEATURE_ART))
                art_related_clocksource = &clocksource_tsc;