[PATCH bpf-next v1 10/14] selftests/bpf: Verify bpf_fastcall decl tags in resolve_btfids test

[Ihor Solodrai <ihor.solodrai@linux.dev>]

Extend test_resolve_btfids() to assert that resolve_btfids emits a
BTF_KIND_DECL_TAG of name "bpf_fastcall" for each kfunc marked with
KF_FASTCALL flag.

Signed-off-by: Ihor Solodrai <ihor.solodrai@linux.dev>
---
 tools/testing/selftests/bpf/prog_tests/resolve_btfids.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/tools/testing/selftests/bpf/prog_tests/resolve_btfids.c b/tools/testing/selftests/bpf/prog_tests/resolve_btfids.c
index 7d9c3460cbed..eeda4e3b6a7f 100644
--- a/tools/testing/selftests/bpf/prog_tests/resolve_btfids.c
+++ b/tools/testing/selftests/bpf/prog_tests/resolve_btfids.c
@@ -246,6 +246,13 @@ void test_resolve_btfids(void)
 					     kfunc_symbols[i].id),
 			    kfunc_symbols[i].name);
 
+	/* Check resolve_btfids emitted bpf_fastcall decl_tag for fastcall kfuncs */
+	for (i = 0; i < ARRAY_SIZE(kfunc_symbols); i++)
+		if (kfunc_symbols[i].flags & KF_FASTCALL)
+			ASSERT_TRUE(btf_has_decl_tag(btf, "bpf_fastcall",
+						     kfunc_symbols[i].id),
+				    kfunc_symbols[i].name);
+
 out:
 	btf__free(btf);
 }
-- 
2.54.0