linux-kernel - Re: [PATCH 2/2] mtd: core: Remove partid and partname debugfs files

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Date:   Mon, 20 Dec 2021 18:37:45 +0530
From:   Pratyush Yadav <p.yadav@...com>
To:     Tudor Ambarus <tudor.ambarus@...rochip.com>
CC:     <miquel.raynal@...tlin.com>, <richard@....at>, <vigneshr@...com>,
        <zhuohao@...omium.org>, <michael@...le.cc>,
        <linux-mtd@...ts.infradead.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] mtd: core: Remove partid and partname debugfs files

On 17/12/21 02:26PM, Tudor Ambarus wrote:
> partid and partname debugfs file are no longer used in mtd, remove
> dead code.

Hmm, spi-nor was the only user? Quick grepping does confirm that.

> 
> Signed-off-by: Tudor Ambarus <tudor.ambarus@...rochip.com>
> ---
>  drivers/mtd/mtdcore.c   | 35 +----------------------------------
>  include/linux/mtd/mtd.h |  3 ---
>  2 files changed, 1 insertion(+), 37 deletions(-)
> 
> diff --git a/drivers/mtd/mtdcore.c b/drivers/mtd/mtdcore.c
> index 9186268d361b..1977755fc955 100644
> --- a/drivers/mtd/mtdcore.c
> +++ b/drivers/mtd/mtdcore.c
> @@ -336,49 +336,16 @@ static const struct device_type mtd_devtype = {
>  	.release	= mtd_release,
>  };
>  
> -static int mtd_partid_debug_show(struct seq_file *s, void *p)
> -{
> -	struct mtd_info *mtd = s->private;
> -
> -	seq_printf(s, "%s\n", mtd->dbg.partid);
> -
> -	return 0;
> -}
> -
> -DEFINE_SHOW_ATTRIBUTE(mtd_partid_debug);
> -
> -static int mtd_partname_debug_show(struct seq_file *s, void *p)
> -{
> -	struct mtd_info *mtd = s->private;
> -
> -	seq_printf(s, "%s\n", mtd->dbg.partname);
> -
> -	return 0;
> -}
> -
> -DEFINE_SHOW_ATTRIBUTE(mtd_partname_debug);
> -
>  static struct dentry *dfs_dir_mtd;
>  
>  static void mtd_debugfs_populate(struct mtd_info *mtd)
>  {
> -	struct mtd_info *master = mtd_get_master(mtd);
>  	struct device *dev = &mtd->dev;
> -	struct dentry *root;
>  
>  	if (IS_ERR_OR_NULL(dfs_dir_mtd))
>  		return;
>  
> -	root = debugfs_create_dir(dev_name(dev), dfs_dir_mtd);
> -	mtd->dbg.dfs_dir = root;
> -
> -	if (master->dbg.partid)
> -		debugfs_create_file("partid", 0400, root, master,
> -				    &mtd_partid_debug_fops);
> -
> -	if (master->dbg.partname)
> -		debugfs_create_file("partname", 0400, root, master,
> -				    &mtd_partname_debug_fops);
> +	mtd->dbg.dfs_dir = debugfs_create_dir(dev_name(dev), dfs_dir_mtd);

What is the point of having creating the directory if there is not going 
to be anything in it at all? I think we should drop the entire thing if 
there is no intention of using it.

>  }
>  
>  #ifndef CONFIG_MMU
> diff --git a/include/linux/mtd/mtd.h b/include/linux/mtd/mtd.h
> index f5e7dfc2e4e9..00cb269d0261 100644
> --- a/include/linux/mtd/mtd.h
> +++ b/include/linux/mtd/mtd.h
> @@ -188,9 +188,6 @@ struct module;	/* only needed for owner field in mtd_info */
>   */
>  struct mtd_debug_info {
>  	struct dentry *dfs_dir;
> -
> -	const char *partname;
> -	const char *partid;
>  };
>  
>  /**
> -- 
> 2.25.1
> 

-- 
Regards,
Pratyush Yadav
Texas Instruments Inc.