linux-kernel - Re: [PATCH v2 06/11] tools/nolibc: add option to disable runtime

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Message-ID: <a6f669b5-6a4e-4735-8c9d-9debdd65cbc9@t-8ch.de>
Date: Sat, 20 Sep 2025 11:08:36 +0200
From: Thomas Weißschuh <linux@...ssschuh.net>
To: Benjamin Berg <benjamin@...solutions.net>
Cc: linux-um@...ts.infradead.org, Willy Tarreau <w@....eu>, 
	linux-kselftest@...r.kernel.org, Arnaldo Carvalho de Melo <acme@...hat.com>, 
	linux-kernel@...r.kernel.org, Benjamin Berg <benjamin.berg@...el.com>
Subject: Re: [PATCH v2 06/11] tools/nolibc: add option to disable runtime

On 2025-09-19 17:34:15+0200, Benjamin Berg wrote:
> From: Benjamin Berg <benjamin.berg@...el.com>
> 
> In principle, it is possible to use nolibc for only some object files in
> a program. In that case, the startup code in _start and _start_c is not
> going to be used. Add the NOLIBC_NO_RUNTIME compile time option to
> disable it entirely and also remove anything that depends on it.
> 
> Doing this avoids warnings from modpost for UML as the _start_c code
> references the main function from the .init.text section while it is not
> inside .init itself.
> 
> Signed-off-by: Benjamin Berg <benjamin.berg@...el.com>

Acked-by: Thomas Weißschuh <linux@...ssschuh.net>

> 
> ---
> v2:
> - Renamed from NOLIBC_NO_STARTCODE to NOLIBC_NO_RUNTIME
> - Put the #ifdef around relevant comments
> ---
>  tools/include/nolibc/arch-arm.h       | 2 ++
>  tools/include/nolibc/arch-arm64.h     | 2 ++
>  tools/include/nolibc/arch-loongarch.h | 2 ++
>  tools/include/nolibc/arch-m68k.h      | 2 ++
>  tools/include/nolibc/arch-mips.h      | 2 ++
>  tools/include/nolibc/arch-powerpc.h   | 2 ++
>  tools/include/nolibc/arch-riscv.h     | 2 ++
>  tools/include/nolibc/arch-s390.h      | 2 ++
>  tools/include/nolibc/arch-sh.h        | 2 ++
>  tools/include/nolibc/arch-sparc.h     | 2 ++
>  tools/include/nolibc/arch-x86.h       | 4 ++++
>  tools/include/nolibc/crt.h            | 3 +++
>  tools/include/nolibc/stackprotector.h | 2 ++
>  tools/include/nolibc/stdlib.h         | 2 ++
>  tools/include/nolibc/sys.h            | 3 ++-
>  tools/include/nolibc/sys/auxv.h       | 3 +++
>  16 files changed, 36 insertions(+), 1 deletion(-)

(...)