[RESEND PATCH V3] PM / EM: Micro optimization in em_cpu_energy

[Pavankumar Kondeti]

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@xxxxxxxxxx>
Reviewed-by: Dietmar Eggemann <dietmar.eggemann@xxxxxxx>
Signed-off-by: Pavankumar Kondeti <pkondeti@xxxxxxxxxxxxxx>
---
 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
-- 
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