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

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Message-Id: <20210410105759.12611-1-sj38.park@gmail.com>
Date:   Sat, 10 Apr 2021 12:57:59 +0200
From:   SeongJae Park <sj38.park@...il.com>
To:     Greg KH <greg@...ah.com>
Cc:     SeongJae Park <sj38.park@...il.com>, 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,
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        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

From: SeongJae Park <sjpark@...zon.de>

On Sat, 10 Apr 2021 10:55:01 +0200 Greg KH <greg@...ah.com> wrote:

> 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?

You're right, I will make it return void in the next spin.


Thanks,
SeongJae Park

> 
> thanks,
> 
> greg k-h
>