linux-kernel - [PATCH bpf-next v3 1/2] kbuild: bpf: Tell pahole to DECL

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Date: Mon, 13 May 2024 12:38:58 -0600
From: Daniel Xu <dxu@...uu.xyz>
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Subject: [PATCH bpf-next v3 1/2] 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/?h=next&id=72e88f29c6f7e14201756e65bd66157427a61aaf

Signed-off-by: Daniel Xu <dxu@...uu.xyz>
---
 scripts/Makefile.btf | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/scripts/Makefile.btf b/scripts/Makefile.btf
index 2d6e5ed9081e..d9ec6c85ffa7 100644
--- a/scripts/Makefile.btf
+++ b/scripts/Makefile.btf
@@ -21,7 +21,7 @@ endif
 else
 
 # Switch to using --btf_features for v1.26 and later.
-pahole-flags-$(call test-ge, $(pahole-ver), 126)  = -j --btf_features=encode_force,var,float,enum64,decl_tag,type_tag,optimized_func,consistent_func
+pahole-flags-$(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
 
 endif
 
-- 
2.44.0