From 1080399542075bb0e9d46ea80418d76784d1ece8 Mon Sep 17 00:00:00 2001 From: Pavankumar Kondeti <pkondeti@codeaurora.org> Date: Sat, 28 Nov 2020 07:09:23 +0530 Subject: [PATCH] PM / EM: Micro optimization in em_cpu_energy When the sum of the utilization of CPUs in a power domain is zero, return the energy as 0 without doing any computations. Acked-by: Quentin Perret <qperret@google.com> Reviewed-by: Dietmar Eggemann <dietmar.eggemann@arm.com> Signed-off-by: Pavankumar Kondeti <pkondeti@codeaurora.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> --- include/linux/energy_model.h | 3 +++ 1 file changed, 3 insertions(+) diff --git a/include/linux/energy_model.h b/include/linux/energy_model.h index 9618c0a46ef41..757fc60658fa6 100644 --- a/include/linux/energy_model.h +++ b/include/linux/energy_model.h @@ -106,6 +106,9 @@ static inline unsigned long em_cpu_energy(struct em_perf_domain *pd, struct em_perf_state *ps; int i, cpu; + if (!sum_util) + return 0; + /* * In order to predict the performance state, map the utilization of * the most utilized CPU of the performance domain to a requested -- GitLab