linux-kernel - Re: [PATCH v2 6/9] debugfs: Implement debugfs_create

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Date:   Fri, 26 Mar 2021 15:19:43 +0100
From:   Greg KH <greg@...ah.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Rasmus Villemoes <linux@...musvillemoes.dk>, mingo@...nel.org,
        mgorman@...e.de, juri.lelli@...hat.com, vincent.guittot@...aro.org,
        dietmar.eggemann@....com, rostedt@...dmis.org, bsegall@...gle.com,
        bristot@...hat.com, joshdon@...gle.com, valentin.schneider@....com,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 6/9] debugfs: Implement debugfs_create_str()

On Fri, Mar 26, 2021 at 03:12:35PM +0100, Peter Zijlstra wrote:
> On Fri, Mar 26, 2021 at 02:10:41PM +0100, Rasmus Villemoes wrote:
> > On 26/03/2021 13.57, Greg KH wrote:
> > > On Fri, Mar 26, 2021 at 01:53:59PM +0100, Rasmus Villemoes wrote:
> > >> On 26/03/2021 12.38, Peter Zijlstra wrote:
> > >>
> > >>> Implement debugfs_create_str() to easily display names and such in
> > >>> debugfs.
> > >>
> > >> Patches 7-9 don't seem to add any users of this. What's it for precisely?
> > > 
> > > It's used in patch 7, look close :)
> > 
> > Ah, macrology. But the write capability doesn't seem used, and I (still)
> > fail to see how that could be useful.
> 
> Correct, it isn't used. But I didn't think it would be acceptible to
> not implement the write side. OTOH, if Greg would be okay with it, I can
> change it to:
> 
> ssize_t debugfs_write_file_str(struct file *file, const char __user *user_buf,
>                                size_t count, loff_t *ppos)
> {
>         /* This is really only for read-only strings */
>         return -EINVAL;
> }
> EXPORT_SYMBOL_GPL(debugfs_write_file_str);
> 
> That's certianly simpler.

Fine with me.  Might as well make it static and not exported as well if
you are touching it :)