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SubjectRe: [PATCH v7 1/5] module.h: MODULE_DEVICE_TABLE for built-in modules
On Sat, Dec 17, 2022 at 4:05 AM Christophe Leroy
<christophe.leroy@csgroup.eu> wrote:
>
>
>
> Le 16/12/2022 à 23:16, Allen Webb a écrit :
> > Implement MODULE_DEVICE_TABLE for build-in modules to make it possible
> > to generate a builtin.alias file to complement modules.alias.
> >
> > Signed-off-by: Allen Webb <allenwebb@google.com>
> > ---
> > include/linux/module.h | 10 +++++++++-
> > 1 file changed, 9 insertions(+), 1 deletion(-)
> >
> > diff --git a/include/linux/module.h b/include/linux/module.h
> > index ec61fb53979a9..49e4019393127 100644
> > --- a/include/linux/module.h
> > +++ b/include/linux/module.h
> > @@ -243,7 +243,15 @@ extern void cleanup_module(void);
> > extern typeof(name) __mod_##type##__##name##_device_table \
> > __attribute__ ((unused, alias(__stringify(name))))
> > #else /* !MODULE */
> > -#define MODULE_DEVICE_TABLE(type, name)
> > +/* The names may not be unique for built-in modules, so include the module name
> > + * to guarantee uniqueness.
> > + */
>
> This is network only comment style.

I have fixed this in my local copy and will include it with the next upload.

>
> Other parts of kenel have different style, see
> https://docs.kernel.org/process/coding-style.html#commenting
>
> > +#define MODULE_DEVICE_TABLE(type, name) \
> > +extern void *CONCATENATE( \
>
> 'extern' keyword is pointless of function prototypes and deprecated.
> Don't add new occurences.


This is a weird case because these symbols are used for post
compilation processing by modpost. If I drop the extern keyword, the
build fails with a bunch of errors of the form:

/mnt/host/source/src/third_party/kernel/upstream/drivers/hid/hid-generic.c:79:1:
error: definition
'__mod_hid__hid_table__kmod_hid_generic_device_table' cannot also be
an alias
MODULE_DEVICE_TABLE(hid, hid_table);
^
/mnt/host/source/src/third_party/kernel/upstream/include/linux/module.h:255:26:
note: expanded from macro 'MODULE_DEVICE_TABLE'
__attribute__ ((unused, alias(__stringify(name))))

>
>
> > + CONCATENATE(__mod_##type##__##name##__, \
> > + __KBUILD_MODNAME), \
> > + _device_table) \
> > + __attribute__ ((unused, alias(__stringify(name))))
> > #endif
> >
> > /* Version of form [<epoch>:]<version>[-<extra-version>].

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