From a7e19859f9fd6eb9e5a11e5645fe42082df40d8a Mon Sep 17 00:00:00 2001 From: Srinivas Pandruvada Date: Thu, 15 Oct 2015 12:34:21 -0700 Subject: [PATCH] cpufreq: intel_pstate: Fix divide by zero on Knights Landing (KNL) commit 8e601a9f97a00bab031980de34f9a81891c1f82f upstream. This is a workaround for KNL platform, where in some cases MPERF counter will not have updated value before next read of MSR_IA32_MPERF. In this case divide by zero will occur. This change ignores current sample for busy calculation in this case. Fixes: b34ef932d79a (intel_pstate: Knights Landing support) Signed-off-by: Srinivas Pandruvada Acked-by: Kristen Carlson Accardi Signed-off-by: Rafael J. Wysocki Signed-off-by: Greg Kroah-Hartman --- drivers/cpufreq/intel_pstate.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c index fcb929ec5304a..aba2117a80c12 100644 --- a/drivers/cpufreq/intel_pstate.c +++ b/drivers/cpufreq/intel_pstate.c @@ -766,6 +766,11 @@ 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 = native_read_tsc(); local_irq_restore(flags); -- 2.47.2