kbuild, bpf: Enable reproducible BTF generation

Pahole v1.27 added a new BTF generation feature to support reproducibility in the face of multithreading. Enable it if supported and reproducible builds are requested. As unknown --btf_features are ignored, avoid the test for the pahole version to keep the line readable. Fixes: b4f7278 ("scripts/pahole-flags.sh: Parse DWARF and generate BTF with multithreading.") Fixes: 72d0918 ("kbuild: avoid too many execution of scripts/pahole-flags.sh") Link: https://lore.kernel.org/lkml/[email protected]/ Link: https://lore.kernel.org/lkml/[email protected]/ Signed-off-by: Thomas Weißschuh <[email protected]>
kernel-patches · Dec 17, 2024 · 89318d7 · 89318d7
1 parent 9a051e1
commit 89318d7
Showing 1 changed file with 1 addition and 0 deletions.
diff --git a/scripts/Makefile.btf b/scripts/Makefile.btf
@@ -22,6 +22,7 @@ else
 
 # Switch to using --btf_features for v1.26 and later.
 pahole-flags-$(call test-ge, $(pahole-ver), 126)  = -j$(JOBS) --btf_features=encode_force,var,float,enum64,decl_tag,type_tag,optimized_func,consistent_func,decl_tag_kfuncs
+pahole-flags-$(if $(KBUILD_BUILD_TIMESTAMP),y) += --btf_features=reproducible_build
 
 ifneq ($(KBUILD_EXTMOD),)
 module-pahole-flags-$(call test-ge, $(pahole-ver), 126) += --btf_features=distilled_base