linux-kernel - Re: [PATCH rcu 9/9] rcu: Replace cpumask_weight with cpumask

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Message-ID: <20220211151750.GC588079@lothringen>
Date:   Fri, 11 Feb 2022 16:17:50 +0100
From:   Frederic Weisbecker <frederic@...nel.org>
To:     "Paul E. McKenney" <paulmck@...nel.org>
Cc:     rcu@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel-team@...com, rostedt@...dmis.org,
        Yury Norov <yury.norov@...il.com>
Subject: Re: [PATCH rcu 9/9] rcu: Replace cpumask_weight with cpumask_empty
 where appropriate

On Fri, Feb 04, 2022 at 03:08:05PM -0800, Paul E. McKenney wrote:
> From: Yury Norov <yury.norov@...il.com>
> 
> In some places, RCU code calls cpumask_weight() to check if any bit of a
> given cpumask is set. We can do it more efficiently with cpumask_empty()
> because cpumask_empty() stops traversing the cpumask as soon as it finds
> first set bit, while cpumask_weight() counts all bits unconditionally.
> 
> Signed-off-by: Yury Norov <yury.norov@...il.com>
> Signed-off-by: Paul E. McKenney <paulmck@...nel.org>

Acked-by: Frederic Weisbecker <frederic@...nel.org>