cpufreq: x86: Disable interrupts during MSRs reading

[mirror_ubuntu-artful-kernel.git] / arch / x86 / kernel / cpu / aperfmperf.c

diff --git a/arch/x86/kernel/cpu/aperfmperf.c b/arch/x86/kernel/cpu/aperfmperf.c
index 7cf7c70b6ef2a20483361fb8333a85ace25bf1d7..0ee83321a3136fcca7a00a3b7e6c375e7a51e13f 100644 (file)
--- a/arch/x86/kernel/cpu/aperfmperf.c
+++ b/arch/x86/kernel/cpu/aperfmperf.c
@@ -40,13 +40,16 @@ static void aperfmperf_snapshot_khz(void *dummy)
        struct aperfmperf_sample *s = this_cpu_ptr(&samples);
        ktime_t now = ktime_get();
        s64 time_delta = ktime_ms_delta(now, s->time);
+       unsigned long flags;
 
        /* Don't bother re-computing within the cache threshold time. */
        if (time_delta < APERFMPERF_CACHE_THRESHOLD_MS)
                return;
 
+       local_irq_save(flags);
        rdmsrl(MSR_IA32_APERF, aperf);
        rdmsrl(MSR_IA32_MPERF, mperf);
+       local_irq_restore(flags);
 
        aperf_delta = aperf - s->aperf;
        mperf_delta = mperf - s->mperf;