linux-kernel - Re: [PATCH] smp: Fix the comments of smp_call_function

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Date:   Mon, 13 Dec 2021 10:05:43 -0800
From:   Dave Hansen <dave.hansen@...el.com>
To:     Zhen Lei <thunder.leizhen@...wei.com>,
        Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        linux-kernel@...r.kernel.org
Cc:     Nadav Amit <namit@...are.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>
Subject: Re: [PATCH] smp: Fix the comments of smp_call_function_many()

On 12/12/21 7:57 PM, Zhen Lei wrote:
> diff --git a/kernel/smp.c b/kernel/smp.c
> index 01a7c1706a58b1d..6ec884f41b7506d 100644
> --- a/kernel/smp.c
> +++ b/kernel/smp.c
> @@ -861,6 +861,13 @@ EXPORT_SYMBOL_GPL(smp_call_function_any);
>  #define SCF_WAIT	(1U << 0)
>  #define SCF_RUN_LOCAL	(1U << 1)
>  
> +/**
> + * smp_call_function_many_cond(): Run a function on a set of CPUs.
> + * @scf_flags: Bitmask that controls the operation. If %SCF_WAIT is set,
> + *        wait (atomically) until function has completed on other CPUs. If
> + *        %SCF_RUN_LOCAL is set, the function will also be run locally
> + *        if the local CPU is set in the @cpumask.
> + */

Fixing up the smp_call_function_many() comment is a good idea.  But, the
new smp_call_function_many_cond() comment duplicates these which are
_just_ above it:

> /*
>  * Flags to be used as scf_flags argument of smp_call_function_many_cond().
>  *
>  * %SCF_WAIT:           Wait until function execution is completed
>  * %SCF_RUN_LOCAL:      Run also locally if local cpu is set in cpumask
>  */
> #define SCF_WAIT        (1U << 0)
> #define SCF_RUN_LOCAL   (1U << 1)

Could we comment the bits in one place?