linux-kernel - Re: [PATCH v2] kbuild: check uniqueness of module names

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Date:   Fri, 17 May 2019 07:36:58 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc:     Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        Sam Ravnborg <sam@...nborg.org>, Arnd Bergmann <arnd@...db.de>,
        Jessica Yu <jeyu@...nel.org>,
        Lucas De Marchi <lucas.de.marchi@...il.com>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        Michael Schmitz <schmitzmic@...il.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Rusty Russell <rusty@...tcorp.com.au>,
        Kees Cook <keescook@...omium.org>,
        Michal Marek <michal.lkml@...kovi.net>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] kbuild: check uniqueness of module names

On Fri, May 17, 2019 at 01:45:11PM +0900, Masahiro Yamada wrote:
> On Fri, May 17, 2019 at 1:29 PM Masahiro Yamada
> <yamada.masahiro@...ionext.com> wrote:
> >
> > In the recent build test of linux-next, Stephen saw a build error
> > caused by a broken .tmp_versions/*.mod file:
> >
> >   https://lkml.org/lkml/2019/5/13/991
> >
> > drivers/net/phy/asix.ko and drivers/net/usb/asix.ko have the same
> > basename, and there is a race in generating .tmp_versions/asix.mod
> >
> > Kbuild has not checked this before, and it suddenly shows up with
> > obscure error message when this kind of race occurs.
> >
> > Non-unique module names cause various sort of problems, but it is
> > not trivial to catch them by eyes.
> >
> > Hence, this script.
> >
> > It checks not only real modules, but also built-in modules (i.e.
> > controlled by tristate CONFIG option, but currently compiled with =y).
> > Non-unique names for built-in modules also cause problems because
> > /sys/modules/ would fall over.
> >
> > I tested allmodconfig on the latest kernel, and it detected the
> > following:
> >
> > warning: same basename if the following are built as modules:
> >   drivers/regulator/88pm800.ko
> >   drivers/mfd/88pm800.ko
> > warning: same basename if the following are built as modules:
> >   drivers/gpu/drm/bridge/adv7511/adv7511.ko
> >   drivers/media/i2c/adv7511.ko
> > warning: same basename if the following are built as modules:
> >   drivers/net/phy/asix.ko
> >   drivers/net/usb/asix.ko
> > warning: same basename if the following are built as modules:
> >   fs/coda/coda.ko
> >   drivers/media/platform/coda/coda.ko
> > warning: same basename if the following are built as modules:
> >   drivers/net/phy/realtek.ko
> >   drivers/net/dsa/realtek.ko
> >
> > Reported-by: Stephen Rothwell <sfr@...b.auug.org.au>
> > Signed-off-by: Masahiro Yamada <yamada.masahiro@...ionext.com>
> > Reviewed-by: Kees Cook <keescook@...omium.org>
> > ---
> 
> 
> One more question popped up.
> 
> External modules are out of scope of the community,
> but it is possible that people create an external module
> that happens to have the same name as an upstream driver.

That is their bug, nothing we can do about that :)

thanks,

greg k-h