linux-kernel - Re: [PATCH v3 3/6] modpost: Make mod_device

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Message-ID: <aD2vSnZhofEPilcL@example.org>
Date: Mon, 2 Jun 2025 16:03:54 +0200
From: Alexey Gladkov <legion@...nel.org>
To: Masahiro Yamada <masahiroy@...nel.org>
Cc: Petr Pavlu <petr.pavlu@...e.com>, Luis Chamberlain <mcgrof@...nel.org>,
	Sami Tolvanen <samitolvanen@...gle.com>,
	Daniel Gomez <da.gomez@...sung.com>,
	Nathan Chancellor <nathan@...nel.org>,
	Nicolas Schier <nicolas.schier@...ux.dev>,
	linux-kernel@...r.kernel.org, linux-modules@...r.kernel.org,
	linux-kbuild@...r.kernel.org
Subject: Re: [PATCH v3 3/6] modpost: Make mod_device_table aliases more unique

On Mon, Jun 02, 2025 at 07:58:41PM +0900, Masahiro Yamada wrote:
> On Mon, Jun 2, 2025 at 5:07 PM Alexey Gladkov <legion@...nel.org> wrote:
> >
> > On Mon, Jun 02, 2025 at 04:45:36PM +0900, Masahiro Yamada wrote:
> > > On Tue, May 27, 2025 at 6:08 PM Alexey Gladkov <legion@...nel.org> wrote:
> > > >
> > > > In order to avoid symbol conflicts if they appear in the same binary, a
> > > > more unique alias identifier can be generated.
> > >
> > > Why must this be unique?
> > >
> > > What problem would happen if the same symbol names
> > > appear in MODULE_DEVICE_TABLE()?
> >
> > Before these patches this was not a problem as non-unique characters are
> > in separate object files when the module is compiled separately.
> >
> > But when the modules are compiled into the kernel, there is a symbol
> > conflict when linking vmlinuz. We have modules that export multiple device
> > tables from different object files.
> 
> This is because the __mod_device_table__* symbols are global, but
> I suspect they do not need to be.
> 
> Let's test this
> https://lore.kernel.org/lkml/20250602105539.392362-1-masahiroy@kernel.org/T/#u

I tested this patch with the config:

make allmodconfig
make mod2yesconfig

and it works.

-- 
Rgrds, legion