linux-kernel - Re: [PATCH] smp: add a best_effort version of smp_call_function

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Date:   Mon, 19 Apr 2021 11:52:33 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Luigi Rizzo <lrizzo@...gle.com>, linux-kernel@...r.kernel.org,
        peterz@...radead.org, axboe@...nel.dk, paulmck@...nel.org
Subject: Re: [PATCH] smp: add a best_effort version of
 smp_call_function_many()

Hi--

On 4/19/21 11:44 AM, Luigi Rizzo wrote:

> 
> Signed-off-by: Luigi Rizzo <lrizzo@...gle.com>
> ---
>  include/linux/smp.h | 10 ++++++
>  kernel/smp.c        | 75 +++++++++++++++++++++++++++++++++++++--------
>  2 files changed, 72 insertions(+), 13 deletions(-)
> 

> diff --git a/kernel/smp.c b/kernel/smp.c
> index aeb0adfa0606..75155875fadc 100644
> --- a/kernel/smp.c
> +++ b/kernel/smp.c

> @@ -693,8 +715,32 @@ static void smp_call_function_many_cond(const struct cpumask *mask,
>  			csd_lock_wait(csd);
>  		}
>  	}
> +	return busy ? cfd->cpumask : NULL;
>  }
>  
> +/**
> + * Extended version of smp_call_function_many(). Same constraints.
> + * @mode == 0 same as wait = false, returns 0;
> + * @mode == 1 same as wait = true, returns 0;
> + * @mode = SMP_CFM_BEST_EFFORT: skips CPUs with previous pending requests,
> + *     returns 0 and *mask unmodified if no CPUs are skipped,
> + *     -EBUSY if CPUs are skipped, and *mask is the set of skipped CPUs

Please convert those comments to real kernel-doc format.
(Documentation/doc-guide/kernel-doc.rst)

> + */
> +int __smp_call_function_many(struct cpumask *mask, smp_call_func_t func,
> +			     void *info, int mode)
> +{

thanks.
-- 
~Randy