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    Subject[RFC 8/9] intel_pstate: ignore scheduler cpufreq callbacks on remote CPUs
    Date
    From: Steve Muckle <smuckle.linux@gmail.com>

    In preparation for the scheduler cpufreq callback happening on remote
    CPUs, check for this case in intel_pstate which currently requires the
    callback run on the local CPU. Such callbacks are ignored for now.

    Signed-off-by: Steve Muckle <smuckle.linux@gmail.com>
    Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
    ---
    drivers/cpufreq/intel_pstate.c | 3 +++
    1 file changed, 3 insertions(+)

    diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c
    index 3d37219a0dd7..bd60f1cd7ea6 100644
    --- a/drivers/cpufreq/intel_pstate.c
    +++ b/drivers/cpufreq/intel_pstate.c
    @@ -1930,6 +1930,9 @@ static void intel_pstate_update_util(struct update_util_data *data, u64 time,
    struct cpudata *cpu = container_of(data, struct cpudata, update_util);
    u64 delta_ns;

    + if (smp_processor_id() != data->cpu)
    + return;
    +
    if (pstate_funcs.get_target_pstate == get_target_pstate_use_cpu_load) {
    if (flags & SCHED_CPUFREQ_IOWAIT) {
    cpu->iowait_boost = int_tofp(1);
    --
    2.7.1.410.g6faf27b
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