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

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Message-ID: <Y3oxyUx0UkWVjGvn@smile.fi.intel.com>
Date:   Sun, 20 Nov 2022 15:55:21 +0200
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Alexander Lobakin <alobakin@...me>
Cc:     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>,
        Grygorii Strashko <grygorii.strashko@...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

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.

>  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