linux-kernel - [PATCH] arm64: Handle .ARM.attributes section in linker scripts

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Message-Id: <20250124-arm64-handle-arm-attributes-in-linker-script-v1-1-74135b6cf349@kernel.org>
Date: Fri, 24 Jan 2025 06:31:57 -0700
From: Nathan Chancellor <nathan@...nel.org>
To: Catalin Marinas <catalin.marinas@....com>, 
 Will Deacon <will@...nel.org>
Cc: 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] arm64: Handle .ARM.attributes section in linker scripts

A recent LLVM commit [1] started generating an .ARM.attributes section
similar to the one that exists for 32-bit, which results in orphan
section warnings (or errors if CONFIG_WERROR is enabled) from the linker
because it is not handled in the arm64 linker scripts.

  ld.lld: error: arch/arm64/kernel/vdso/vgettimeofday.o:(.ARM.attributes) is being placed in '.ARM.attributes'
  ld.lld: error: arch/arm64/kernel/vdso/vgetrandom.o:(.ARM.attributes) is being placed in '.ARM.attributes'

  ld.lld: error: vmlinux.a(lib/vsprintf.o):(.ARM.attributes) is being placed in '.ARM.attributes'
  ld.lld: error: vmlinux.a(lib/win_minmax.o):(.ARM.attributes) is being placed in '.ARM.attributes'
  ld.lld: error: vmlinux.a(lib/xarray.o):(.ARM.attributes) is being placed in '.ARM.attributes'

Add this new section to the necessary linker scripts to resolve the warnings.

Cc: stable@...r.kernel.org
Fixes: b3e5d80d0c48 ("arm64/build: Warn on orphan section placement")
Link: https://github.com/llvm/llvm-project/commit/ee99c4d4845db66c4daa2373352133f4b237c942 [1]
Signed-off-by: Nathan Chancellor <nathan@...nel.org>
---
 arch/arm64/kernel/vdso/vdso.lds.S | 1 +
 arch/arm64/kernel/vmlinux.lds.S   | 1 +
 2 files changed, 2 insertions(+)

diff --git a/arch/arm64/kernel/vdso/vdso.lds.S b/arch/arm64/kernel/vdso/vdso.lds.S
index 4ec32e86a8da..f8418a3a2758 100644
--- a/arch/arm64/kernel/vdso/vdso.lds.S
+++ b/arch/arm64/kernel/vdso/vdso.lds.S
@@ -75,6 +75,7 @@ SECTIONS
 
 	DWARF_DEBUG
 	ELF_DETAILS
+	.ARM.attributes 0 : { *(.ARM.attributes) }
 
 	/DISCARD/	: {
 		*(.data .data.* .gnu.linkonce.d.* .sdata*)
diff --git a/arch/arm64/kernel/vmlinux.lds.S b/arch/arm64/kernel/vmlinux.lds.S
index f84c71f04d9e..c94942e9eb46 100644
--- a/arch/arm64/kernel/vmlinux.lds.S
+++ b/arch/arm64/kernel/vmlinux.lds.S
@@ -335,6 +335,7 @@ SECTIONS
 	STABS_DEBUG
 	DWARF_DEBUG
 	ELF_DETAILS
+	.ARM.attributes 0 : { *(.ARM.attributes) }
 
 	HEAD_SYMBOLS
 

---
base-commit: 1dd3393696efba1598aa7692939bba99d0cffae3
change-id: 20250123-arm64-handle-arm-attributes-in-linker-script-82aee25313ac

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