linux-kernel - Re: [PATCH 5/5] cpumask: fix comment of cpumask

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Message-ID: <ZAYXJ2E+JHcp2kD/@yury-laptop>
Date:   Mon, 6 Mar 2023 08:39:03 -0800
From:   Yury Norov <yury.norov@...il.com>
To:     Vernon Yang <vernon2gm@...il.com>
Cc:     torvalds@...ux-foundation.org, tytso@....edu, Jason@...c4.com,
        davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com, jejb@...ux.ibm.com, martin.petersen@...cle.com,
        andriy.shevchenko@...ux.intel.com, linux@...musvillemoes.dk,
        james.smart@...adcom.com, dick.kennedy@...adcom.com,
        linux-kernel@...r.kernel.org, wireguard@...ts.zx2c4.com,
        netdev@...r.kernel.org, linux-scsi@...r.kernel.org
Subject: Re: [PATCH 5/5] cpumask: fix comment of cpumask_xxx

On Tue, Mar 07, 2023 at 12:06:51AM +0800, Vernon Yang wrote:
> After commit 596ff4a09b89 ("cpumask: re-introduce constant-sized cpumask
> optimizations"), the cpumask size is divided into three different case,
> so fix comment of cpumask_xxx correctly.
> 
> Signed-off-by: Vernon Yang <vernon2gm@...il.com>
> ---
>  include/linux/cpumask.h | 46 ++++++++++++++++++++---------------------
>  1 file changed, 23 insertions(+), 23 deletions(-)
> 
> diff --git a/include/linux/cpumask.h b/include/linux/cpumask.h
> index 8fbe76607965..248bdb1c50dc 100644
> --- a/include/linux/cpumask.h
> +++ b/include/linux/cpumask.h
> @@ -155,7 +155,7 @@ static __always_inline unsigned int cpumask_check(unsigned int cpu)
>   * cpumask_first - get the first cpu in a cpumask
>   * @srcp: the cpumask pointer
>   *
> - * Returns >= nr_cpu_ids if no cpus set.
> + * Returns >= small_cpumask_bits if no cpus set.

There's no such thing like small_cpumask_bits. Here and everywhere,
nr_cpu_ids must be used.

Actually, before 596ff4a09b89 nr_cpumask_bits was deprecated, and it
must be like that for all users even now.

nr_cpumask_bits must be considered as internal cpumask parameter and
never referenced outside of cpumask code.

Thansk,
Yury