linux-kernel - Re: [PATCH v3 2/6] iio: light: Add gain-time-scale helpers

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Message-ID: <ZBBWlyDtyinbZBNJ@smile.fi.intel.com>
Date:   Tue, 14 Mar 2023 13:12:23 +0200
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     "Vaittinen, Matti" <Matti.Vaittinen@...rohmeurope.com>
Cc:     Matti Vaittinen <mazziesaccount@...il.com>,
        Jonathan Cameron <jic23@...nel.org>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Shreeya Patel <shreeya.patel@...labora.com>,
        Paul Gazzillo <paul@...zz.com>,
        Dmitry Osipenko <dmitry.osipenko@...labora.com>,
        Zhigang Shi <Zhigang.Shi@...eon.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-iio@...r.kernel.org" <linux-iio@...r.kernel.org>
Subject: Re: [PATCH v3 2/6] iio: light: Add gain-time-scale helpers

On Tue, Mar 14, 2023 at 06:19:35AM +0000, Vaittinen, Matti wrote:
> On 3/13/23 15:14, Andy Shevchenko wrote:
> > On Mon, Mar 13, 2023 at 02:56:59PM +0200, Matti Vaittinen wrote:
> >> On 3/12/23 18:51, Jonathan Cameron wrote:
> >>> On Mon, 6 Mar 2023 14:52:57 +0200
> >>> Andy Shevchenko <andriy.shevchenko@...ux.intel.com> wrote:
> >>>> On Mon, Mar 06, 2023 at 11:17:15AM +0200, Matti Vaittinen wrote:

...

> >>>>> +EXPORT_SYMBOL_NS_GPL(iio_gts_total_gain_to_scale, IIO_GTS_HELPER);
> >>>>
> >>>> I would say _HELPER part is too much, but fine with me.
> >>>
> >>> Hmm. I think I like the HELPER bit as separates it from being a driver.
> >>> Of course I might change my mind after a few sleeps.
> >>
> >> Ever considered a career as a politician? ;) (No offense intended - and feel
> >> free to change your mind on this. I don't expect this to be done tomorrow)
> > 
> > It will be a one liner in the provider if you use DEFAULT_SYMBOL_NAMESPACE
> > definition.
> 
> Oh. I didn't know about DEFAULT_SYMBOL_NAMESPACE - or if I did, I had 
> forgot it. My memory has never been great and seems to be getting worse 
> all the time...
> 
> I don't know what to think of this define though. I can imagine that 
> someone who is not familiar with it could be very confused as to why the 
> symbols are not found even though EXPORT_SYMBOL or EXPORT_SYMBOL_GPL are 
> used. OTOH, I think I once saw an error about symbols being in a 
> namespace (when trying to use one without the namespace). This should 
> probably just be a good enough hint for finding out what's going on.
> 
> Luckily, I think all the exports in this case were oneliners even with 
> the namespace explicitly spelled. Well, I think that for one or two 
> exports the semicolon did slip to col 81 or 82 - but I am not sure if 
> fixing this weighs more than the clarity of explicitly showing the 
> namespace in export.
> 
> Well, I guess I can go with either of these ways - do you have a strong 
> opinion on using the DEFAULT_SYMBOL_NAMESPACE?

If you asking me, I'm fine with either way. Usually the latter makes sense
when we expect APIs in the certain module to:
1) always belong to the single namespace, *and / or*
2) be expanded in the future w/o bothering about their (default) NS, *and not*
3) be a single exported function for the feasible future.

Also you made a good point about line length, but with all respect, I prefer
100 than 80 and I do not believe we ever will have function name + NS longer
than that.

-- 
With Best Regards,
Andy Shevchenko