linux-kernel - Re: [PATCH 1/2] ARM: Require linker to support KEEP within OVERLAY for DCE

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Message-ID: <CACRpkdY-yxaiG89Co+C2=vyd0i6sh9pP0UGWZh1yUg4jd9jmuQ@mail.gmail.com>
Date: Thu, 13 Mar 2025 09:48:42 +0100
From: Linus Walleij <linus.walleij@...aro.org>
To: Nathan Chancellor <nathan@...nel.org>
Cc: Russell King <linux@...linux.org.uk>, Christian Eggers <ceggers@...i.de>, 
	Arnd Bergmann <arnd@...db.de>, Yuntao Liu <liuyuntao12@...wei.com>, 
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, 
	llvm@...ts.linux.dev, stable@...r.kernel.org
Subject: Re: [PATCH 1/2] ARM: Require linker to support KEEP within OVERLAY
 for DCE

On Tue, Mar 11, 2025 at 8:43 PM Nathan Chancellor <nathan@...nel.org> wrote:

> ld.lld prior to 21.0.0 does not support using the KEEP keyword within an
> overlay description, which may be needed to avoid discarding necessary
> sections within an overlay with '--gc-sections', which can be enabled
> for the kernel via CONFIG_LD_DEAD_CODE_DATA_ELIMINATION.
>
> Disallow CONFIG_LD_DEAD_CODE_DATA_ELIMINATION without support for KEEP
> within OVERLAY and introduce a macro, OVERLAY_KEEP, that can be used to
> conditionally add KEEP when it is properly supported to avoid breaking
> old versions of ld.lld.
>
> Cc: stable@...r.kernel.org
> Link: https://github.com/llvm/llvm-project/commit/381599f1fe973afad3094e55ec99b1620dba7d8c
> Signed-off-by: Nathan Chancellor <nathan@...nel.org>

Very clear and easy to follow.
Reviewed-by: Linus Walleij <linus.walleij@...aro.org>

Yours,
Linus Walleij