linux-kernel - Re: [PATCH] mm/damon/sysfs: remove repeat container_of() in damon_sysfs_kdamond

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Message-Id: <20220303084235.356-1-sj@kernel.org>
Date:   Thu,  3 Mar 2022 08:42:35 +0000
From:   SeongJae Park <sj@...nel.org>
To:     Xin Hao <xhao@...ux.alibaba.com>
Cc:     sj@...nel.org, akpm@...ux-foundation.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm/damon/sysfs: remove repeat container_of() in damon_sysfs_kdamond_release()

Hi Xin,


On Thu, 3 Mar 2022 15:53:14 +0800 Xin Hao <xhao@...ux.alibaba.com> wrote:

> In damon_sysfs_kdamond_release(), we have use container_of() to get
> "kdamond" pointer, so there no need to get it once again.

Good catch!  Thank you always :)

> 
> Signed-off-by: Xin Hao <xhao@...ux.alibaba.com>

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


Thanks,
SJ

> ---
>  mm/damon/sysfs.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/mm/damon/sysfs.c b/mm/damon/sysfs.c
> index a4ad6b473b0a..687e7c7e8dea 100644
> --- a/mm/damon/sysfs.c
> +++ b/mm/damon/sysfs.c
> @@ -2432,7 +2432,7 @@ static void damon_sysfs_kdamond_release(struct kobject *kobj)
>  
>  	if (kdamond->damon_ctx)
>  		damon_destroy_ctx(kdamond->damon_ctx);
> -	kfree(container_of(kobj, struct damon_sysfs_kdamond, kobj));
> +	kfree(kdamond);
>  }
>  
>  static struct kobj_attribute damon_sysfs_kdamond_state_attr =
> -- 
> 2.27.0