linux-kernel - [PATCH] lib/Kconfig.debug: Disable CONFIG_DEBUG_INFO

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Message-Id: <20240105-hexagon-disable-btf-v1-1-ddab073e7f74@kernel.org>
Date: Fri, 05 Jan 2024 12:13:04 -0700
From: Nathan Chancellor <nathan@...nel.org>
To: akpm@...ux-foundation.org
Cc: ndesaulniers@...gle.com, acme@...nel.org, dwarves@...r.kernel.org, 
 llvm@...ts.linux.dev, linux-hexagon@...r.kernel.org, 
 linux-kernel@...r.kernel.org, patches@...ts.linux.dev, 
 kernel test robot <lkp@...el.com>, Brian Cain <bcain@...cinc.com>, 
 Nathan Chancellor <nathan@...nel.org>
Subject: [PATCH] lib/Kconfig.debug: Disable CONFIG_DEBUG_INFO_BTF for
 Hexagon

pahole, which generates BTF, relies on elfutils to process DWARF debug
info. Because kernel modules are relocatable files, elfutils needs to
resolve relocations when processing the DWARF .debug sections.

Hexagon is not supported in binutils or elfutils, so elfutils is unable
to process relocations in kernel modules, causing pahole to crash during
BTF generation.

Do not allow CONFIG_DEBUG_INFO_BTF to be selected for Hexagon until it
is supported in elfutils, so that there are no more cryptic build
failures during BTF generation.

Reported-by: kernel test robot <lkp@...el.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202312192107.wMIKiZWw-lkp@intel.com/
Suggested-by: Nick Desaulniers <ndesaulniers@...gle.com>
Acked-by: Brian Cain <bcain@...cinc.com>
Signed-off-by: Nathan Chancellor <nathan@...nel.org>
---
 lib/Kconfig.debug | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 4405f81248fb..1b939f5583eb 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -378,6 +378,8 @@ config DEBUG_INFO_BTF
 	depends on !GCC_PLUGIN_RANDSTRUCT || COMPILE_TEST
 	depends on BPF_SYSCALL
 	depends on !DEBUG_INFO_DWARF5 || PAHOLE_VERSION >= 121
+	# pahole uses elfutils, which does not have support for Hexagon relocations
+	depends on !HEXAGON
 	help
 	  Generate deduplicated BTF type information from DWARF debug info.
 	  Turning this on expects presence of pahole tool, which will convert

---
base-commit: 610a9b8f49fbcf1100716370d3b5f6f884a2835a
change-id: 20240105-hexagon-disable-btf-1ee7cab7d5f8

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