linux-kernel - Re: [PATCH v4 08/63] kbuild: Remove 'kmod_' prefix from __KBUILD

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Message-ID: <aPipsiGv2OyZyIv7@monster>
Date: Wed, 22 Oct 2025 11:53:54 +0200
From: Anders Roxell <anders.roxell@...aro.org>
To: Josh Poimboeuf <jpoimboe@...nel.org>
Cc: Alexander Stein <alexander.stein@...tq-group.com>, x86@...nel.org,
	linux-kernel@...r.kernel.org, Petr Mladek <pmladek@...e.com>,
	Miroslav Benes <mbenes@...e.cz>,
	Joe Lawrence <joe.lawrence@...hat.com>,
	live-patching@...r.kernel.org, Song Liu <song@...nel.org>,
	laokz <laokz@...mail.com>, Jiri Kosina <jikos@...nel.org>,
	Marcos Paulo de Souza <mpdesouza@...e.com>,
	Weinan Liu <wnliu@...gle.com>,
	Fazla Mehrab <a.mehrab@...edance.com>,
	Chen Zhongjin <chenzhongjin@...wei.com>,
	Puranjay Mohan <puranjay@...nel.org>,
	Dylan Hatch <dylanbhatch@...gle.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Masahiro Yamada <masahiroy@...nel.org>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Mark Brown <broonie@...nel.org>,
	Cosmin Tanislav <demonsingur@...il.com>
Subject: Re: [PATCH v4 08/63] kbuild: Remove 'kmod_' prefix from
 __KBUILD_MODNAME

On 2025-10-20 10:22, Josh Poimboeuf wrote:
> On Mon, Oct 20, 2025 at 02:20:35PM +0200, Alexander Stein wrote:
> > Hi,
> > 
> > Am Mittwoch, 17. September 2025, 18:03:16 CEST schrieb Josh Poimboeuf:
> > > In preparation for the objtool klp diff subcommand, remove the arbitrary
> > > 'kmod_' prefix from __KBUILD_MODNAME and instead add it explicitly in
> > > the __initcall_id() macro.
> > > 
> > > This change supports the standardization of "unique" symbol naming by
> > > ensuring the non-unique portion of the name comes before the unique
> > > part.  That will enable objtool to properly correlate symbols across
> > > builds.
> > > 
> > > Cc: Masahiro Yamada <masahiroy@...nel.org>
> > > Signed-off-by: Josh Poimboeuf <jpoimboe@...nel.org>
> > 
> > Starting with this commit 6717e8f91db71 ("kbuild: Remove 'kmod_' prefix
> > from __KBUILD_MODNAME") in next-20251020 I don't get any
> > module aliases anymore.
> > modinfo spi-fsl-dspi.ko returns:
> > > filename:       /work/repo/linux/build_arm64/drivers/spi/spi-fsl-dspi.ko
> > > alias:          platform:fsl-dspi
> > > license:        GPL
> > > description:    Freescale DSPI Controller Driver
> > > depends:        
> > > intree:         Y
> > > name:           spi_fsl_dspi
> > > vermagic:       6.18.0-rc1+ SMP preempt mod_unload modversions aarch64
> > 
> > but it should be like this:
> > > filename:       /work/repo/linux/build_arm64/drivers/spi/spi-fsl-dspi.ko
> > > alias:          platform:fsl-dspi
> > > license:        GPL
> > > description:    Freescale DSPI Controller Driver
> > > alias:          of:N*T*Cnxp,s32g2-dspiC*
> 
> Thanks, this patch broke the MODULE_DEVICE_TABLE() macro, as it no
> longer produces the format expected by scripts/mod/file2alias.c.
> 
> I didn't see this in x86 testing since it doesn't have device tree.
> 
> I will post the following fix shortly:

Tested-by: Anders Roxell <anders.roxell@...aro.org>

When can we expect it?

Cheers,
Anders

> 
> diff --git a/include/linux/module.h b/include/linux/module.h
> index e135cc79aceea..d80c3ea574726 100644
> --- a/include/linux/module.h
> +++ b/include/linux/module.h
> @@ -251,10 +251,11 @@ struct module_kobject *lookup_or_create_module_kobject(const char *name);
>   */
>  #define __mod_device_table(type, name)	\
>  	__PASTE(__mod_device_table__,	\
> +	__PASTE(kmod_,			\
>  	__PASTE(__KBUILD_MODNAME,	\
>  	__PASTE(__,			\
>  	__PASTE(type,			\
> -	__PASTE(__, name)))))
> +	__PASTE(__, name))))))
>  
>  /* Creates an alias so file2alias.c can find device table. */
>  #define MODULE_DEVICE_TABLE(type, name)					\