linux-kernel - Re: [PATCH v27 07/13] mm/damon: Implement a debugfs-based user space interface

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Message-ID: <YHFn5fOTIQQ4TXHA@kroah.com>
Date:   Sat, 10 Apr 2021 10:55:01 +0200
From:   Greg KH <greg@...ah.com>
To:     SeongJae Park <sj38.park@...il.com>
Cc:     akpm@...ux-foundation.org, SeongJae Park <sjpark@...zon.de>,
        Jonathan.Cameron@...wei.com, acme@...nel.org,
        alexander.shishkin@...ux.intel.com, amit@...nel.org,
        benh@...nel.crashing.org, brendanhiggins@...gle.com,
        corbet@....net, david@...hat.com, dwmw@...zon.com,
        elver@...gle.com, fan.du@...el.com, foersleo@...zon.de,
        gthelen@...gle.com, guoju.fgj@...baba-inc.com, mgorman@...e.de,
        minchan@...nel.org, mingo@...hat.com, namhyung@...nel.org,
        peterz@...radead.org, riel@...riel.com, rientjes@...gle.com,
        rostedt@...dmis.org, rppt@...nel.org, shakeelb@...gle.com,
        shuah@...nel.org, snu@...zon.de, vbabka@...e.cz,
        vdavydov.dev@...il.com, zgf574564920@...il.com,
        linux-damon@...zon.com, linux-mm@...ck.org,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v27 07/13] mm/damon: Implement a debugfs-based user space
 interface

On Thu, Apr 08, 2021 at 01:48:48PM +0000, SeongJae Park wrote:
> +static int dbgfs_fill_ctx_dir(struct dentry *dir, struct damon_ctx *ctx)
> +{
> +	const char * const file_names[] = {"attrs", "target_ids"};
> +	const struct file_operations *fops[] = {&attrs_fops, &target_ids_fops};
> +	int i;
> +
> +	for (i = 0; i < ARRAY_SIZE(file_names); i++)
> +		debugfs_create_file(file_names[i], 0600, dir, ctx, fops[i]);
> +
> +	return 0;
> +}

Why do you have a function that can only return 0, actually return
something?  It should be void, right?

thanks,

greg k-h