diff options
| author | Takashi Iwai <tiwai@suse.de> | 2015-10-23 06:57:50 +0200 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2015-10-23 06:57:50 +0200 |
| commit | 274035751e25ee15a064e43cde7b4e7a9b75d921 (patch) | |
| tree | bf5f3f18f14855043324ef02a116532d866e3dac /drivers/cpufreq/intel_pstate.c | |
| parent | ALSA: Remove transfer_ack_{begin,end} callbacks from struct snd_pcm_runtime (diff) | |
| parent | ASoC: cht_bsw_rt5672: Use snd_pcm_hw_constraint_single() (diff) | |
| download | linux-274035751e25ee15a064e43cde7b4e7a9b75d921.tar.xz linux-274035751e25ee15a064e43cde7b4e7a9b75d921.zip | |
Merge branch 'topic/hw-constraint-single' into for-next
Diffstat (limited to 'drivers/cpufreq/intel_pstate.c')
| -rw-r--r-- | drivers/cpufreq/intel_pstate.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c index 3af9dd7332e6..aa33b92b3e3e 100644 --- a/drivers/cpufreq/intel_pstate.c +++ b/drivers/cpufreq/intel_pstate.c @@ -776,6 +776,11 @@ static inline void intel_pstate_sample(struct cpudata *cpu) local_irq_save(flags); rdmsrl(MSR_IA32_APERF, aperf); rdmsrl(MSR_IA32_MPERF, mperf); + if (cpu->prev_mperf == mperf) { + local_irq_restore(flags); + return; + } + tsc = rdtsc(); local_irq_restore(flags); |