linux-kernel - [PATCH 0/2] ARM: Fix ARM_VECTORS with CONFIG_LD_DEAD_CODE_DATA

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Message-Id: <20250311-arm-fix-vectors-with-linker-dce-v1-0-ec4c382e3bfd@kernel.org>
Date: Tue, 11 Mar 2025 20:43:41 +0100
From: Nathan Chancellor <nathan@...nel.org>
To: Russell King <linux@...linux.org.uk>
Cc: Christian Eggers <ceggers@...i.de>, Arnd Bergmann <arnd@...db.de>, 
 Linus Walleij <linus.walleij@...aro.org>, 
 Yuntao Liu <liuyuntao12@...wei.com>, linux-arm-kernel@...ts.infradead.org, 
 linux-kernel@...r.kernel.org, llvm@...ts.linux.dev, stable@...r.kernel.org, 
 Nathan Chancellor <nathan@...nel.org>
Subject: [PATCH 0/2] ARM: Fix ARM_VECTORS with
 CONFIG_LD_DEAD_CODE_DATA_ELIMINATION

Hi all,

Christian sent a fix [1] for ARM_VECTORS with
CONFIG_LD_DEAD_CODE_DATA_ELIMINATION that exposed a deficiency in ld.lld
with regards to KEEP() within an OVERLAY description. I have fixed that
in ld.lld [2] and added a patch before Christian's to disallow
CONFIG_LD_DEAD_CODE_DATA_ELIMINATION when KEEP() cannot be used within
OVERLAY to keep everything working for all linkers.

[1]: https://lore.kernel.org/20250221125520.14035-1-ceggers@arri.de/
[2]: https://github.com/llvm/llvm-project/commit/381599f1fe973afad3094e55ec99b1620dba7d8c

---
Christian Eggers (1):
      ARM: add KEEP() keyword to ARM_VECTORS

Nathan Chancellor (1):
      ARM: Require linker to support KEEP within OVERLAY for DCE

 arch/arm/Kconfig                   |  2 +-
 arch/arm/include/asm/vmlinux.lds.h | 12 +++++++++---
 init/Kconfig                       |  5 +++++
 3 files changed, 15 insertions(+), 4 deletions(-)
---
base-commit: 80e54e84911a923c40d7bee33a34c1b4be148d7a
change-id: 20250311-arm-fix-vectors-with-linker-dce-83475b0b8f5b

Best regards,
-- 
Nathan Chancellor <nathan@...nel.org>