linux-kernel - Re: [PATCH 1/2] cpumask: Add for_each_cpu

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Date: Wed, 20 Mar 2024 11:31:17 -0700
From: Yury Norov <yury.norov@...il.com>
To: Kyle Meyer <kyle.meyer@....com>
Cc: andriy.shevchenko@...ux.intel.com, linux@...musvillemoes.dk,
	mingo@...hat.com, peterz@...radead.org, juri.lelli@...hat.com,
	vincent.guittot@...aro.org, dietmar.eggemann@....com,
	rostedt@...dmis.org, bsegall@...gle.com, mgorman@...e.de,
	bristot@...hat.com, vschneid@...hat.com,
	linux-kernel@...r.kernel.org, russ.anderson@....com,
	dimitri.sivanich@....com, steve.wahl@....com
Subject: Re: [PATCH 1/2] cpumask: Add for_each_cpu_from()

On Tue, Mar 19, 2024 at 01:51:47PM -0500, Kyle Meyer wrote:
> Add for_each_cpu_from() as a generic cpumask macro.
> 
> for_each_cpu_from() is the same as for_each_cpu(), except it starts at
> @cpu instead of zero.
> 
> Signed-off-by: Kyle Meyer <kyle.meyer@....com>

Acked-by: Kyle Meyer <kyle.meyer@....com>

> ---
>  include/linux/cpumask.h | 10 ++++++++++
>  1 file changed, 10 insertions(+)
> 
> diff --git a/include/linux/cpumask.h b/include/linux/cpumask.h
> index 1c29947db848..655211db38ff 100644
> --- a/include/linux/cpumask.h
> +++ b/include/linux/cpumask.h
> @@ -368,6 +368,16 @@ unsigned int __pure cpumask_next_wrap(int n, const struct cpumask *mask, int sta
>  #define for_each_cpu_or(cpu, mask1, mask2)				\
>  	for_each_or_bit(cpu, cpumask_bits(mask1), cpumask_bits(mask2), small_cpumask_bits)
>  
> +/**
> + * for_each_cpu_from - iterate over every cpu present in @mask, starting at @cpu
> + * @cpu: the (optionally unsigned) integer iterator
> + * @mask: the cpumask pointer
> + *
> + * After the loop, cpu is >= nr_cpu_ids.
> + */
> +#define for_each_cpu_from(cpu, mask)				\
> +	for_each_set_bit_from(cpu, cpumask_bits(mask), small_cpumask_bits)
> +
>  /**
>   * cpumask_any_but - return a "random" in a cpumask, but not this one.
>   * @mask: the cpumask to search
> -- 
> 2.44.0