Re: [PATCH v4 bpf-next 3/5] kbuild: build kernel module BTFs if BTF is enabled and pahole supports it
From: David Ahern <hidden>
Date: 2020-11-17 03:44:50
Also in:
bpf, lkml
On 11/9/20 6:19 PM, Andrii Nakryiko wrote:
quoted hunk
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug index d7a7bc3b6098..1e78faaf20a5 100644 --- a/lib/Kconfig.debug +++ b/lib/Kconfig.debug@@ -274,6 +274,15 @@ config DEBUG_INFO_BTF Turning this on expects presence of pahole tool, which will convert DWARF type info into equivalent deduplicated BTF type info. +config PAHOLE_HAS_SPLIT_BTF + def_bool $(success, test `$(PAHOLE) --version | sed -E 's/v([0-9]+)\.([0-9]+)/\1\2/'` -ge "119") + +config DEBUG_INFO_BTF_MODULES + def_bool y + depends on DEBUG_INFO_BTF && MODULES && PAHOLE_HAS_SPLIT_BTF + help + Generate compact split BTF type information for kernel modules. + config GDB_SCRIPTS bool "Provide GDB scripts for kernel debugging" help
Thank you for adding a config option for this feature vs bumping the required pahole version in scripts/link-vmlinux.sh. This is a much more friendly way of handling kernel features that require support from build tools.