linux-kernel - Re: [PATCH] mm/damon: remove return value from before

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Message-Id: <20211029072218.16880-1-sj@kernel.org>
Date:   Fri, 29 Oct 2021 07:22:18 +0000
From:   SeongJae Park <sj@...nel.org>
To:     Changbin Du <changbin.du@...il.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        SeongJae Park <sj@...nel.org>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm/damon: remove return value from before_terminate callback

On Fri, 29 Oct 2021 08:50:23 +0800 Changbin Du <changbin.du@...il.com> wrote:

> Since the return value of 'before_terminate' callback is never used,
> we make it have no return value.
> 
> Signed-off-by: Changbin Du <changbin.du@...il.com>

Thank you for this patch!

Reviewed-by: SeongJae Park <sj@...nel.org>


Thanks,
SJ

> ---
>  include/linux/damon.h | 2 +-
>  mm/damon/dbgfs.c      | 5 ++---
>  2 files changed, 3 insertions(+), 4 deletions(-)
> 
> diff --git a/include/linux/damon.h b/include/linux/damon.h
> index 50c6eb0dee1f..041966786270 100644
> --- a/include/linux/damon.h
> +++ b/include/linux/damon.h
> @@ -322,7 +322,7 @@ struct damon_callback {
>  	int (*before_start)(struct damon_ctx *context);
>  	int (*after_sampling)(struct damon_ctx *context);
>  	int (*after_aggregation)(struct damon_ctx *context);
> -	int (*before_terminate)(struct damon_ctx *context);
> +	void (*before_terminate)(struct damon_ctx *context);
>  };
>  
>  /**
> diff --git a/mm/damon/dbgfs.c b/mm/damon/dbgfs.c
> index befb27a29aab..eccc14b34901 100644
> --- a/mm/damon/dbgfs.c
> +++ b/mm/damon/dbgfs.c
> @@ -645,18 +645,17 @@ static void dbgfs_fill_ctx_dir(struct dentry *dir, struct damon_ctx *ctx)
>  		debugfs_create_file(file_names[i], 0600, dir, ctx, fops[i]);
>  }
>  
> -static int dbgfs_before_terminate(struct damon_ctx *ctx)
> +static void dbgfs_before_terminate(struct damon_ctx *ctx)
>  {
>  	struct damon_target *t, *next;
>  
>  	if (!targetid_is_pid(ctx))
> -		return 0;
> +		return;
>  
>  	damon_for_each_target_safe(t, next, ctx) {
>  		put_pid((struct pid *)t->id);
>  		damon_destroy_target(t);
>  	}
> -	return 0;
>  }
>  
>  static struct damon_ctx *dbgfs_new_ctx(void)
> -- 
> 2.32.0