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

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Message-Id: <20221123000151.64567-1-alobakin@mailbox.org>
Date:   Wed, 23 Nov 2022 01:01:51 +0100
From:   Alexander Lobakin <alobakin@...lbox.org>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     Alexander Lobakin <alobakin@...lbox.org>,
        Alexander Lobakin <alobakin@...me>,
        linux-kbuild@...r.kernel.org,
        Masahiro Yamada <masahiroy@...nel.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>,
        Daniel Scally <djrscally@...il.com>,
        Hans de Goede <hdegoede@...hat.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: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Date: Sun, 20 Nov 2022 15:55:21 +0200

> On Sat, Nov 19, 2022 at 11:08:17PM +0000, Alexander Lobakin wrote:
> > common.o is linked to both intel_skl_int3472_{discrete,tps68470}:
> > 
> > > scripts/Makefile.build:252: ./drivers/platform/x86/intel/int3472/Makefile:
> > > common.o is added to multiple modules: intel_skl_int3472_discrete
> > > intel_skl_int3472_tps68470
> > 
> > Although both drivers share one Kconfig option
> > (CONFIG_INTEL_SKL_INT3472), it's better to not link one object file
> > into several modules (and/or vmlinux).
> > Under certain circumstances, such can lead to the situation fixed by
> > commit 637a642f5ca5 ("zstd: Fixing mixed module-builtin objects").
> > 
> > Introduce the new module, intel_skl_int3472_common, to provide the
> > functions from common.o to both discrete and tps68470 drivers. This
> > adds only 3 exports and doesn't provide any changes to the actual
> > code.
> 
> ...
> 
> > +MODULE_IMPORT_NS(INTEL_SKL_INT3472);
> > +
> 
> Redundant blank line. You may put it to be last MODULE_*() in the file, if you
> think it would be more visible.

My intention was that it's not "standard" module info like license
or description, rather something like exports or initcalls, that's
why I did separate them.
But I haven't been using module namespaces a lot previously, so if
it should be in one block with the rest MODULE_*(), sure, I'll fix.

> 
> >  MODULE_DESCRIPTION("Intel SkyLake INT3472 ACPI Discrete Device Driver");
> >  MODULE_AUTHOR("Daniel Scally <djrscally@...il.com>");
> >  MODULE_LICENSE("GPL v2");
> 
> ...
> 
> > +MODULE_IMPORT_NS(INTEL_SKL_INT3472);
> > +
> >  MODULE_DESCRIPTION("Intel SkyLake INT3472 ACPI TPS68470 Device Driver");
> >  MODULE_AUTHOR("Daniel Scally <djrscally@...il.com>");
> >  MODULE_LICENSE("GPL v2");
> 
> Ditto. And the same to all your patches.
> 
> -- 
> With Best Regards,
> Andy Shevchenko

Thanks,
Olek