linux-kernel - Re: [PATCH] scripts: Introduce ARCH_WANTS_RELA_DYN to avoid stripping .rela.dyn section

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Message-ID: <877c49tvmx.fsf@all.your.base.are.belong.to.us>
Date: Fri, 28 Mar 2025 09:19:34 +0100
From: Björn Töpel <bjorn@...nel.org>
To: Alexandre Ghiti <alexghiti@...osinc.com>, Paul Walmsley
 <paul.walmsley@...ive.com>, Palmer Dabbelt <palmer@...belt.com>, Alexandre
 Ghiti <alex@...ti.fr>, Björn Töpel
 <bjorn@...osinc.com>, Masahiro Yamada
 <masahiroy@...nel.org>, Nathan Chancellor <nathan@...nel.org>, Nicolas
 Schier <nicolas@...sle.eu>, Ard Biesheuvel <ardb@...nel.org>, Charlie
 Jenkins <charlie@...osinc.com>, linux-kernel@...r.kernel.org,
 linux-riscv@...ts.infradead.org, linux-kbuild@...r.kernel.org
Cc: Alexandre Ghiti <alexghiti@...osinc.com>
Subject: Re: [PATCH] scripts: Introduce ARCH_WANTS_RELA_DYN to avoid
 stripping .rela.dyn section

Alexandre Ghiti <alexghiti@...osinc.com> writes:

> riscv uses the .rela.dyn section to relocate the kernel at runtime but
> that section is stripped from vmlinux. That prevents kexec to
> successfully load vmlinux since it does not contain the relocations info
> needed.
>
> Fix this by introducing a new config ARCH_WANTS_RELA_DYN that prevents
> .rela.dyn to be stripped.
>
> Fixes: 71d815bf5dfd ("kbuild: Strip runtime const RELA sections correctly")
> Signed-off-by: Alexandre Ghiti <alexghiti@...osinc.com>

Thanks, Alex! This fix makes it possible to kexec into RISC-V vmlinux w/
CONFIG_RELOCATABLE.

Tested-by: Björn Töpel <bjorn@...osinc.com>
Reviewed-by: Björn Töpel <bjorn@...osinc.com>