linux-kernel - Re: [PATCH RESEND] sched: fair: drop useless cpumask_empty() in find_energy_efficient

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Message-ID: <20251208085059.GB3707891@noisy.programming.kicks-ass.net>
Date: Mon, 8 Dec 2025 09:50:59 +0100
From: Peter Zijlstra <peterz@...radead.org>
To: "Yury Norov (NVIDIA)" <yury.norov@...il.com>
Cc: Ingo Molnar <mingo@...hat.com>, Juri Lelli <juri.lelli@...hat.com>,
	Vincent Guittot <vincent.guittot@...aro.org>,
	Dietmar Eggemann <dietmar.eggemann@....com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Ben Segall <bsegall@...gle.com>, Mel Gorman <mgorman@...e.de>,
	Valentin Schneider <vschneid@...hat.com>,
	linux-kernel@...r.kernel.org,
	Markus Elfring <Markus.Elfring@....de>,
	Madadi Vineeth Reddy <vineethr@...ux.ibm.com>,
	K Prateek Nayak <kprateek.nayak@....com>
Subject: Re: [PATCH RESEND] sched: fair: drop useless cpumask_empty() in
 find_energy_efficient_cpu()

On Sat, Dec 06, 2025 at 11:05:42PM -0500, Yury Norov (NVIDIA) wrote:
> cpumask_empty() call is O(N) and useless because the previous
> cpumask_and() returns false for empty 'cpus'. Drop it.
> 
> CC: Markus Elfring <Markus.Elfring@....de>
> Reviewed-by: Madadi Vineeth Reddy <vineethr@...ux.ibm.com>
> Reviewed-by: K Prateek Nayak <kprateek.nayak@....com>
> Reviewed-by: Vincent Guittot <vincent.guittot@...aro.org>
> Signed-off-by: Yury Norov (NVIDIA) <yury.norov@...il.com>

Picked it (and the other two) up for processing after rc1.