linux-kernel - [PATCH 07/11] s390/boot: vmlinux.lds.S: Handle DWARF debug sections

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Message-Id: <20240207-s390-lld-and-orphan-warn-v1-7-8a665b3346ab@kernel.org>
Date: Wed, 07 Feb 2024 17:14:59 -0700
From: Nathan Chancellor <nathan@...nel.org>
To: hca@...ux.ibm.com, gor@...ux.ibm.com, agordeev@...ux.ibm.com
Cc: borntraeger@...ux.ibm.com, svens@...ux.ibm.com, maskray@...gle.com, 
 ndesaulniers@...gle.com, linux-s390@...r.kernel.org, 
 linux-kernel@...r.kernel.org, llvm@...ts.linux.dev, patches@...ts.linux.dev, 
 Nathan Chancellor <nathan@...nel.org>
Subject: [PATCH 07/11] s390/boot: vmlinux.lds.S: Handle DWARF debug
 sections

When building with CONFIG_LD_ORPHAN_WARN after selecting
CONFIG_ARCH_HAS_LD_ORPHAN_WARN, there are several series of warnings for
each file in arch/s390/boot due to the boot linker script not handling
the DWARF debug sections:

  s390-linux-ld: warning: orphan section `.debug_line' from `arch/s390/boot/head.o' being placed in section `.debug_line'
  s390-linux-ld: warning: orphan section `.debug_info' from `arch/s390/boot/head.o' being placed in section `.debug_info'
  s390-linux-ld: warning: orphan section `.debug_abbrev' from `arch/s390/boot/head.o' being placed in section `.debug_abbrev'
  s390-linux-ld: warning: orphan section `.debug_aranges' from `arch/s390/boot/head.o' being placed in section `.debug_aranges'
  s390-linux-ld: warning: orphan section `.debug_str' from `arch/s390/boot/head.o' being placed in section `.debug_str'

include/asm-generic/vmlinux.lds.h has a macro for DWARF debug sections
named DWARF_DEBUG, use it to clear up the warnings.

Signed-off-by: Nathan Chancellor <nathan@...nel.org>
---
 arch/s390/boot/vmlinux.lds.S | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/s390/boot/vmlinux.lds.S b/arch/s390/boot/vmlinux.lds.S
index ff8c62d84f98..83af17bfe630 100644
--- a/arch/s390/boot/vmlinux.lds.S
+++ b/arch/s390/boot/vmlinux.lds.S
@@ -122,6 +122,8 @@ SECTIONS
 	}
 	_end = .;
 
+	DWARF_DEBUG
+
 	/*
 	 * Sections that should stay zero sized, which is safer to
 	 * explicitly check instead of blindly discarding.

-- 
2.43.0