linux-kernel - Re: [patch V3 10/20] sched/mmcid: Convert mm CID mask to a bitmap

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Message-ID: <f0f2bf69-4554-40f9-9d0b-478d1ad5bdb1@efficios.com>
Date: Thu, 30 Oct 2025 09:59:09 -0400
From: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
To: Thomas Gleixner <tglx@...utronix.de>, LKML <linux-kernel@...r.kernel.org>
Cc: Peter Zijlstra <peterz@...radead.org>,
 Gabriele Monaco <gmonaco@...hat.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>, Shrikanth Hegde <sshegde@...ux.ibm.com>
Subject: Re: [patch V3 10/20] sched/mmcid: Convert mm CID mask to a bitmap

On 2025-10-29 09:09, Thomas Gleixner wrote:
[...]
> @@ -1363,7 +1363,7 @@ static inline void mm_init_cid(struct mm
>   	mm->mm_cid.nr_cpus_allowed = p->nr_cpus_allowed;
>   	raw_spin_lock_init(&mm->mm_cid.lock);
>   	cpumask_copy(mm_cpus_allowed(mm), &p->cpus_mask);
> -	cpumask_clear(mm_cidmask(mm));
> +	bitmap_zero(mm_cidmask(mm), bitmap_size(num_possible_cpus()));

Then perhaps you'll also want to update mm_cid_size() to:

     return cpumask_size() + bitmap_size(num_possible_cpus());      /* mm_cpus_allowed(), mm_cidmask(). */

Thanks,

Mathieu

-- 
Mathieu Desnoyers
EfficiOS Inc.
https://www.efficios.com