linux-kernel - Re: [PATCH v9 05/10] module.h: MODULE_DEVICE

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Date:   Tue, 20 Dec 2022 07:45:38 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Allen Webb <allenwebb@...gle.com>
Cc:     "linux-modules@...r.kernel.org" <linux-modules@...r.kernel.org>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Luis Chamberlain <mcgrof@...nel.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>
Subject: Re: [PATCH v9 05/10] module.h: MODULE_DEVICE_TABLE for built-in
 modules

On Mon, Dec 19, 2022 at 02:46:13PM -0600, Allen Webb wrote:
> 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@...gle.com>
> ---
>  include/linux/module.h | 15 ++++++++++++++-
>  1 file changed, 14 insertions(+), 1 deletion(-)
> 
> diff --git a/include/linux/module.h b/include/linux/module.h
> index ec61fb53979a..3d1b04ca6350 100644
> --- a/include/linux/module.h
> +++ b/include/linux/module.h
> @@ -243,7 +243,20 @@ 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.

What "names" are you referring to here with the words, "The names"?

And built-in modules have the same rules as external names, they have to
be unique so I do not understand the problem you are trying to solve
here, which means you need to describe it better in both the changelog
text and the comment.

> + *
> + * Note that extern is needed because modpost reads these symbols to generate
> + * modalias entries for each match id in each device table. They are not used
> + * at runtime.

This comment isn't explaining much about what the #define is to be used
for, is it?

confused,

greg k-h