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Wysocki" , Daniel Lezcano , Quentin Perret , "Gustavo A. R. Silva" Subject: [RESEND PATCH V3] PM / EM: Micro optimization in em_cpu_energy Date: Sat, 28 Nov 2020 07:09:23 +0530 Message-Id: <1606527564-27238-1-git-send-email-pkondeti@codeaurora.org> X-Mailer: git-send-email 2.7.4 In-Reply-To: <671427cc-2abb-68eb-5e54-0851785efa84@intel.com> References: <671427cc-2abb-68eb-5e54-0851785efa84@intel.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 Reviewed-by: Dietmar Eggemann Signed-off-by: Pavankumar Kondeti --- 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 b67a51c..8810f1f 100644 --- a/include/linux/energy_model.h +++ b/include/linux/energy_model.h @@ -103,6 +103,9 @@ 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 -- Qualcomm India Private Limited, on behalf of Qualcomm Innovation Center, Inc. Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux Foundation Collaborative Project.