[PATCH v4 07/17] kbuild: generate module BTF based on vmlinux.unstripped
From: Thomas Weißschuh <linux@weissschuh.net>
Date: 2026-01-13 12:37:47
Also in:
linux-arch, linux-doc, linux-integrity, linux-kbuild, linux-modules, linux-security-module, lkml
Subsystem:
kernel build + files below scripts/ (unless maintained elsewhere), the rest · Maintainers:
Nathan Chancellor, Nicolas Schier, Linus Torvalds
The upcoming module hashes functionality will build the modules in between the generation of the BTF data and the final link of vmlinux. At this point vmlinux is not yet built and therefore can't be used for module BTF generation. vmlinux.unstripped however is usable and sufficient for BTF generation. Signed-off-by: Thomas Weißschuh <linux@weissschuh.net> --- scripts/Makefile.modfinal | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/scripts/Makefile.modfinal b/scripts/Makefile.modfinal
index adfef1e002a9..930db0524a0a 100644
--- a/scripts/Makefile.modfinal
+++ b/scripts/Makefile.modfinal@@ -40,11 +40,11 @@ quiet_cmd_ld_ko_o = LD [M] $@ quiet_cmd_btf_ko = BTF [M] $@ cmd_btf_ko = \ - if [ ! -f $(objtree)/vmlinux ]; then \ - printf "Skipping BTF generation for %s due to unavailability of vmlinux\n" $@ 1>&2; \ + if [ ! -f $(objtree)/vmlinux.unstripped ]; then \ + printf "Skipping BTF generation for %s due to unavailability of vmlinux.unstripped\n" $@ 1>&2; \ else \ - LLVM_OBJCOPY="$(OBJCOPY)" $(PAHOLE) -J $(PAHOLE_FLAGS) $(MODULE_PAHOLE_FLAGS) --btf_base $(objtree)/vmlinux $@; \ - $(RESOLVE_BTFIDS) -b $(objtree)/vmlinux $@; \ + LLVM_OBJCOPY="$(OBJCOPY)" $(PAHOLE) -J $(PAHOLE_FLAGS) $(MODULE_PAHOLE_FLAGS) --btf_base $(objtree)/vmlinux.unstripped $@; \ + $(RESOLVE_BTFIDS) -b $(objtree)/vmlinux.unstripped $@; \ fi; # Same as newer-prereqs, but allows to exclude specified extra dependencies
--
2.52.0