linux-kernel - Re: [patch V4 09/20] cpumask: Cache num_possible

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Message-ID: <d8fb051f-6367-46e7-9376-7a3c32d088f0@linux.ibm.com>
Date: Tue, 18 Nov 2025 10:06:53 +0530
From: Shrikanth Hegde <sshegde@...ux.ibm.com>
To: Thomas Gleixner <tglx@...utronix.de>, LKML <linux-kernel@...r.kernel.org>
Cc: Peter Zijlstra <peterz@...radead.org>,
        Gabriele Monaco <gmonaco@...hat.com>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Michael Jeanson <mjeanson@...icios.com>, Jens Axboe <axboe@...nel.dk>,
        "Paul E. McKenney" <paulmck@...nel.org>,
        "Gautham R. Shenoy" <gautham.shenoy@....com>,
        Florian Weimer <fweimer@...hat.com>, Tim Chen <tim.c.chen@...el.com>,
        Yury Norov <yury.norov@...il.com>
Subject: Re: [patch V4 09/20] cpumask: Cache num_possible_cpus()



On 11/17/25 2:18 AM, Thomas Gleixner wrote:
> Reevaluating num_possible_cpus() over and over does not make sense. That
> becomes a constant after init as cpu_possible_mask is marked ro_after_init.
> 
> Cache the value during initialization and provide that for consumption.
> 
> Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
> Reviewed-by: Yury Norov <yury.norov@...il.com>

Reviewed-by: Shrikanth Hegde <sshegde@...ux.ibm.com>