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kbuild: bpf: Tell pahole to DECL_TAG kfuncs

With [0], pahole can now discover kfuncs and inject DECL_TAG into BTF. With this commit, we will start shipping said DECL_TAGs to downstream consumers if pahole supports it. This is useful for feature probing kfuncs as well as generating compilable prototypes. This is particularly important as kfuncs do not have stable ABI. [0]: https://git.kernel.org/pub/scm/devel/pahole/pahole.git/commit/?id=72e88f29c6f7e14201756e65bd66157427a61aaf

Daniel Xu committed 2 years ago

Commit ebb79e91 parent 98b303c1 file · +1 −1Browse files

Unified · Split

scripts/Makefile.btf+1−1
@@ -19,7 +19,7 @@ pahole-flags-$(call test-ge, $(pahole-ver), 125) += --skip_encoding_btf_inconsis · 18 unmodified lines
1919 else
2020
2121 # Switch to using --btf_features for v1.26 and later.
22−pahole-flags-$(call test-ge, $(pahole-ver), 126) = -j --btf_features=encode_force,var,float,enum64,decl_tag,type_tag,optimized_func,consistent_func
22+pahole-flags-$(call test-ge, $(pahole-ver), 126) = -j --btf_features=encode_force,var,float,enum64,decl_tag,type_tag,optimized_func,consistent_func,decl_tag_kfuncs
2323
2424 endif
2525