linux-kernel - Re: [RFC PATCH 1/9] elf: Add relocation types used by nolibc

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Message-ID: <b4415f80-1564-4b13-ab7d-aec653a7258b@t-8ch.de>
Date: Sun, 1 Feb 2026 17:25:17 +0100
From: Thomas Weißschuh <linux@...ssschuh.net>
To: Daniel Palmer <daniel@...ngy.jp>
Cc: w@....eu, kees@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 1/9] elf: Add relocation types used by nolibc

On 2026-01-31 16:44:32+0900, Daniel Palmer wrote:
> nolibc based programs are gaining the ability to relocate themselves
> so that they can support PIE without needing a linker or special
> crt from the toolchain.
> 
> Add the required relocation types.
> 
> Signed-off-by: Daniel Palmer <daniel@...ngy.jp>
> ---
>  include/uapi/linux/elf-r.h | 27 +++++++++++++++++++++++++++
>  include/uapi/linux/elf.h   |  1 +
>  2 files changed, 28 insertions(+)
>  create mode 100644 include/uapi/linux/elf-r.h
> 
> diff --git a/include/uapi/linux/elf-r.h b/include/uapi/linux/elf-r.h
> new file mode 100644
> index 000000000000..a1dce23104a7
> --- /dev/null
> +++ b/include/uapi/linux/elf-r.h
> @@ -0,0 +1,27 @@
> +/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
> +#ifndef _LINUX_ELF_R_H
> +#define _LINUX_ELF_R_H
> +
> +/* These constants define various ELF relocation types */
> +#define R_386_RELATIVE		8

This will break the regular kernel build, as these constants are now
defined twice. A proper version will need to move all these constants
from the kernel-internal headers to the UAPI headers.

For the RFC phase this is fine, though.

(...)