linux-kernel - Re: [PATCH v6 1/4] lib: new helper kstrtodev

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Message-ID: <CAHp75VcC2adjcPUiWaZhXZgocWDPoUJZwGMYNfJWSqyqDAY1Dg@mail.gmail.com>
Date:   Thu, 20 Feb 2020 13:57:00 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>
Cc:     Sascha Hauer <kernel@...gutronix.de>,
        "open list:SERIAL DRIVERS" <linux-serial@...r.kernel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Jacek Anaszewski <jacek.anaszewski@...il.com>,
        Pavel Machek <pavel@....cz>, Jiri Slaby <jslaby@...e.com>,
        Linux LED Subsystem <linux-leds@...r.kernel.org>,
        Dan Murphy <dmurphy@...com>
Subject: Re: [PATCH v6 1/4] lib: new helper kstrtodev_t()

On Thu, Feb 20, 2020 at 1:46 PM Andy Shevchenko
<andy.shevchenko@...il.com> wrote:
> On Thu, Feb 20, 2020 at 12:57 PM Uwe Kleine-König
> <u.kleine-koenig@...gutronix.de> wrote:
> > On Thu, Feb 20, 2020 at 12:22:36PM +0200, Andy Shevchenko wrote:

...

> > Also I don't understand yet, what you want me to do.
>
> I have issues with kstrto() not playing with simple numbers (boolean

s/simple/simple and single/

> is a special case, but still a number at the end).
> I also don't feel good with too narrow usage of the newly introduced helper
>
> > Assume I'd be
> > willing to use simple_strtoul, I'd still want to have a function that
> > gives me a dev_t from a given string. Should I put this directly in my
> > led-trigger driver?
>
> I see the following possibilities:

(above doesn't imply the necessity of simple_strto*() use)

> a) put it inside the caller and forget about generic helper
> b) do a generic helper, but 1/ in string_*() namespace, 2/ with a
> delimiter parameter and 3/ possibility to take negative numbers
>
> In b) case, add to the commit message how many potential _existing_
> users may be converted to this.
> Also it would be good to have two versions strict (only \n at the end
> is allowed) and non-strict (based on the amount of users for each
> group).

And don't forget to extend lib/test_string.c accordingly.

-- 
With Best Regards,
Andy Shevchenko