linux-kernel - Re: [PATCH 11/18] platform/x86: int3472: fix object shared between several modules

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Date:   Wed, 23 Nov 2022 22:10:35 +0100
From:   Alexander Lobakin <alobakin@...lbox.org>
To:     Hans de Goede <hdegoede@...hat.com>,
        Masahiro Yamada <masahiroy@...nel.org>
Cc:     Alexander Lobakin <alobakin@...lbox.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Alexander Lobakin <alobakin@...me>,
        linux-kbuild@...r.kernel.org, Nicolas Schier <nicolas@...sle.eu>,
        Jens Axboe <axboe@...nel.dk>,
        Boris Brezillon <bbrezillon@...nel.org>,
        Borislav Petkov <bp@...en8.de>,
        Tony Luck <tony.luck@...el.com>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Vladimir Oltean <vladimir.oltean@....com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Derek Chickles <dchickles@...vell.com>,
        Ioana Ciornei <ioana.ciornei@....com>,
        Salil Mehta <salil.mehta@...wei.com>,
        Sunil Goutham <sgoutham@...vell.com>,
        Grygorii Strashko <grygorii.strashko@...com>,
        Daniel Scally <djrscally@...il.com>,
        Mark Brown <broonie@...nel.org>,
        NXP Linux Team <linux-imx@....com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 11/18] platform/x86: int3472: fix object shared between several modules

From: Hans de Goede <hdegoede@...hat.com>
Date: Mon, 21 Nov 2022 09:12:41 +0100

> Hi,
> 
> On 11/21/22 00:45, Masahiro Yamada wrote:
> > On Mon, Nov 21, 2022 at 5:55 AM Hans de Goede <hdegoede@...hat.com> wrote:

[...]

> >> So nack from me for this patch, since I really don't see
> >> it adding any value.
> > 
> > 
> > 
> > 
> > This does have a value.
> > 
> > This clarifies the ownership of the common.o,
> > in other words, makes KBUILD_MODNAME deterministic.
> > 
> > 
> > If an object belongs to a module,
> > KBUILD_MODNAME is defined as the module name.
> > 
> > If an object is always built-in,
> > KBUILD_MODNAME is defined as the basename of the object.
> > 
> > 
> > 
> > Here is a question:
> > if common.o is shared by two modules intel_skl_int3472_discrete
> > and intel_skl_int3472_tps68470, what should KBUILD_MODNAME be?
> > 
> > 
> > I see some patch submissions relying on the assumption that
> > KBUILD_MODNAME is unique.
> > We cannot determine KBUILD_MODNAME correctly if an object is shared
> > by multiple modules.

+1

> > 
> > 
> > 
> > 
> > 
> > 
> > BTW, this patch is not the way I suggested.
> > The Suggested-by should not have been there
> > (or at least Reported-by)

(to Masahiro)

Ah, you're right, sorry. Will replace all the tags to Reported-by,
that would look more correct.

> > 
> > 
> > You argued "common.o is tiny", so I would vote for
> > making them inline functions, like
> > 
> > 
> > https://lore.kernel.org/linux-kbuild/20221119225650.1044591-2-alobakin@pm.me/T/#u
> 
> Yes just moving the contents of common.c to static inline helpers in common.h
> would be much better.

Sure, why not. There probably are more of shared object files which
would feel better being static inlines in the series, will see.

> 
> If someone creates such a patch, please do not forget to Cc
> platform-driver-x86@...r.kernel.org

Got it, sure. get_maintainer.pl dropped a wall on me, so I was
picking stuff manually from it and missed that one.

> 
> Regards,
> 
> Hans

[...]

> >>> Ditto. And the same to all your patches.

Thanks,
Olek