linux-kernel - Re: [PATCH v3] kbuild: check uniqueness of module names

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Date:   Sun, 19 May 2019 09:16:51 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc:     linux-kbuild@...r.kernel.org, Arnd Bergmann <arnd@...db.de>,
        Jessica Yu <jeyu@...nel.org>,
        Lucas De Marchi <lucas.demarchi@...el.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>,
        Bernd Petrovitsch <bernd@...rovitsch.priv.at>,
        Alexander Kapshuk <alexander.kapshuk@...il.com>,
        Sam Ravnborg <sam@...nborg.org>,
        Michal Marek <michal.lkml@...kovi.net>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] kbuild: check uniqueness of module names

On Sat, May 18, 2019 at 01:07:15AM +0900, Masahiro Yamada 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>
> Reviewed-by: Stephen Rothwell <sfr@...b.auug.org.au>
> Reviewed-by: Lucas De Marchi <lucas.demarchi@...el.com>

Reviewed-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>