From: Vincent Minet Date: Fri, 4 Jul 2014 23:51:33 +0000 (+0200) Subject: intel_pstate: Set CPU number before accessing MSRs X-Git-Tag: firefly_0821_release~176^2~3642^2^2~1 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=179e8471673ce0249cd4ecda796008f7757e5bad;p=firefly-linux-kernel-4.4.55.git intel_pstate: Set CPU number before accessing MSRs Ensure that cpu->cpu is set before writing MSR_IA32_PERF_CTL during CPU initialization. Otherwise only cpu0 has its P-state set and all other cores are left with their values unchanged. In most cases, this is not too serious because the P-states will be set correctly when the timer function is run. But when the default governor is set to performance, the per-CPU current_pstate stays the same forever and no attempts are made to write the MSRs again. Signed-off-by: Vincent Minet Cc: All applicable Signed-off-by: Rafael J. Wysocki --- diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c index 127ead814619..86631cb6f7de 100644 --- a/drivers/cpufreq/intel_pstate.c +++ b/drivers/cpufreq/intel_pstate.c @@ -700,9 +700,8 @@ static int intel_pstate_init_cpu(unsigned int cpunum) cpu = all_cpu_data[cpunum]; - intel_pstate_get_cpu_pstates(cpu); - cpu->cpu = cpunum; + intel_pstate_get_cpu_pstates(cpu); init_timer_deferrable(&cpu->timer); cpu->timer.function = intel_pstate_timer_func;