linux-kernel - Re: [PATCH] cpumask: Remove unnecessary cpumask_nth

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Message-ID: <aFbETVWvuXewnRfx@yury>
Date: Sat, 21 Jun 2025 10:40:13 -0400
From: Yury Norov <yury.norov@...il.com>
To: Shaopeng Tan <tan.shaopeng@...fujitsu.com>
Cc: linux-kernel@...r.kernel.org,
	Rasmus Villemoes <linux@...musvillemoes.dk>,
	Reinette Chatre <reinette.chatre@...el.com>,
	James Morse <james.morse@....com>,
	Dave Martin <dave.martin@....com>, fenghuay@...dia.com
Subject: Re: [PATCH] cpumask: Remove unnecessary cpumask_nth_andnot()

On Fri, Jun 13, 2025 at 04:37:30PM +0900, Shaopeng Tan wrote:
> Commit 94f753143028("x86/resctrl: Optimize cpumask_any_housekeeping()")
> switched the only user of cpumask_nth_andnot() to other cpumask functions,
> but left the function cpumask_nth_andnot() unused, delete it.
> 
> Signed-off-by: Shaopeng Tan <tan.shaopeng@...fujitsu.com>

This makes find_nth_andnot_bit() unused as well. Can you send a v2
that removes both? Also, the following patch in the series doesn't
look relevant. Can you send it separately?

Thanks,
Yury

> ---
>  include/linux/cpumask.h | 16 ----------------
>  1 file changed, 16 deletions(-)
> 
> diff --git a/include/linux/cpumask.h b/include/linux/cpumask.h
> index 7ae80a7ca81e..498790f74fa8 100644
> --- a/include/linux/cpumask.h
> +++ b/include/linux/cpumask.h
> @@ -546,22 +546,6 @@ unsigned int cpumask_nth_and(unsigned int cpu, const struct cpumask *srcp1,
>  				small_cpumask_bits, cpumask_check(cpu));
>  }
>  
> -/**
> - * cpumask_nth_andnot - get the Nth cpu set in 1st cpumask, and clear in 2nd.
> - * @srcp1: the cpumask pointer
> - * @srcp2: the cpumask pointer
> - * @cpu: the Nth cpu to find, starting from 0
> - *
> - * Return: >= nr_cpu_ids if such cpu doesn't exist.
> - */
> -static __always_inline
> -unsigned int cpumask_nth_andnot(unsigned int cpu, const struct cpumask *srcp1,
> -							const struct cpumask *srcp2)
> -{
> -	return find_nth_andnot_bit(cpumask_bits(srcp1), cpumask_bits(srcp2),
> -				small_cpumask_bits, cpumask_check(cpu));
> -}
> -
>  /**
>   * cpumask_nth_and_andnot - get the Nth cpu set in 1st and 2nd cpumask, and clear in 3rd.
>   * @srcp1: the cpumask pointer
> -- 
> 2.43.5