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Date:   Mon, 29 Apr 2019 16:21:56 +0200
From:   Jessica Yu <>
To:     Alexey Gladkov <>
Cc:     Masahiro Yamada <>,
        Linux Kernel Mailing List <>,
        Linux Kbuild mailing list <>,,,
        "Kirill A . Shutemov" <>,
        Gleb Fotengauer-Malinovskiy <>,
        "Dmitry V. Levin" <>,
        Michal Marek <>,
        Dmitry Torokhov <>,
        Rusty Russell <>,
        Lucas De Marchi <>
Subject: Re: [PATCH v3] moduleparam: Save information about built-in modules
 in separate file

+++ Alexey Gladkov [29/04/19 11:08 +0200]:
>When a kernel module is compiled as a separate module, some important
>information about the kernel module is available via .modinfo section of
>the module.  In contrast, when the kernel module is compiled into the
>kernel, that information is not available.
>Information about built-in modules is necessary in the following cases:
>1. When it is necessary to find out what additional parameters can be
>passed to the kernel at boot time.
>2. When you need to know which module names and their aliases are in
>the kernel. This is very useful for creating an initrd image.
>The proposed patch does not remove .modinfo section with module
>information from the vmlinux at the build time and saves it into a
>separate file after kernel linking. So, the kernel does not increase in
>size and no additional information remains in it. Information is stored
>in the same format as in the separate modules (null-terminated string
>array). Because the .modinfo section is already exported with a separate
>modules, we are not creating a new API.
>It can be easily read in the userspace:
>$ tr '\0' '\n' < kernel.builtin


Otherwise, for module.h and moduleparam.h:

Acked-by: Jessica Yu <>

And it would be great if Lucas can confirm if the file format and name
would be OK for kmod.



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