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/[email protected] Signed-off-by: Nathan Chancellor <[email protected]> Reported-by: kernel test robot <[email protected]> Closes: https://lore.kernel.org/oe-kbuild-all/[email protected]/ Suggested-by: Nick Desaulniers <[email protected]> Acked-by: Brian Cain <[email protected]> Cc: Arnaldo Carvalho de Melo <[email protected]> Signed-off-by: Andrew Morton <[email protected]>
wafgo · Jan 12, 2024 · aaa2c9a · aaa2c9a
1 parent 65cc868
commit aaa2c9a
Showing 1 changed file with 2 additions and 0 deletions.
diff --git 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