Commit aaa2c9a9 authored by Nathan Chancellor's avatar Nathan Chancellor Committed by Andrew Morton
Browse files

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.

Link: https://lkml.kernel.org/r/20240105-hexagon-disable-btf-v1-1-ddab073e7f74@kernel.org


Signed-off-by: default avatarNathan Chancellor <nathan@kernel.org>
Reported-by: default avatarkernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202312192107.wMIKiZWw-lkp@intel.com/


Suggested-by: default avatarNick Desaulniers <ndesaulniers@google.com>
Acked-by: default avatarBrian Cain <bcain@quicinc.com>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
parent 65cc8680

lib/Kconfig.debug

+2 −0
Original line number Diff line number Diff line
@@ -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