linux-kernel - Re: [PATCH v2 1/6] cpumask: introduce for_each_cpu_and

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Message-Id: <20231207134156.494973b8d8aa7e1aac4891d6@linux-foundation.org>
Date:   Thu, 7 Dec 2023 13:41:56 -0800
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Yury Norov <yury.norov@...il.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>, linux-kernel@...r.kernel.org,
        Ming Lei <ming.lei@...hat.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Rasmus Villemoes <linux@...musvillemoes.dk>
Subject: Re: [PATCH v2 1/6] cpumask: introduce for_each_cpu_and_from()

On Thu,  7 Dec 2023 12:38:55 -0800 Yury Norov <yury.norov@...il.com> wrote:

> Similarly to for_each_cpu_and(), introduce a for_each_cpu_and_from(),
> which is handy when it's needed to traverse 2 cpumasks or bitmaps,
> starting from a given position.

A naming question:

> --- a/include/linux/cpumask.h
> +++ b/include/linux/cpumask.h
> @@ -332,6 +332,17 @@ unsigned int __pure cpumask_next_wrap(int n, const struct cpumask *mask, int sta
>  #define for_each_cpu_and(cpu, mask1, mask2)				\
>  	for_each_and_bit(cpu, cpumask_bits(mask1), cpumask_bits(mask2), small_cpumask_bits)
>  
> +/**
> + * for_each_cpu_and_from - iterate over every cpu in both masks starting from a given cpu
> + * @cpu: the (optionally unsigned) integer iterator
> + * @mask1: the first cpumask pointer
> + * @mask2: the second cpumask pointer
> + *
> + * After the loop, cpu is >= nr_cpu_ids.
> + */
> +#define for_each_cpu_and_from(cpu, mask1, mask2)				\
> +	for_each_and_bit_from(cpu, cpumask_bits(mask1), cpumask_bits(mask2), small_cpumask_bits)

Shouldn't this be for_each_and_cpu_from()?  That seems more consistent
and makes a little more sense given what the iterator does.