[PATCH bpf-next v2 4/5] selftests/bpf: Test duplicate unique fields in nested structs

[Kumar Kartikeya Dwivedi <memxor@gmail.com>]

Add a raw BTF test with a spin lock directly in a struct and another in a
nested struct. The duplicate must now be rejected during BTF loading.

Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
---
 tools/testing/selftests/bpf/prog_tests/btf.c | 27 ++++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/tools/testing/selftests/bpf/prog_tests/btf.c b/tools/testing/selftests/bpf/prog_tests/btf.c
index 66855cbd6b73..2100400d896b 100644
--- a/tools/testing/selftests/bpf/prog_tests/btf.c
+++ b/tools/testing/selftests/bpf/prog_tests/btf.c
@@ -4250,6 +4250,33 @@ static struct btf_raw_test raw_tests[] = {
 	.max_entries = 1,
 },
 
+/*
+ * struct inner {
+ *     struct bpf_spin_lock lock;
+ * };
+ *
+ * struct value {
+ *     struct bpf_spin_lock lock;
+ *     struct inner nested;
+ * };
+ */
+{
+	.descr = "struct test duplicate nested unique fields",
+	.raw_types = {
+		BTF_TYPE_INT_ENC(NAME_TBD, BTF_INT_SIGNED, 0, 32, 4),	/* [1] */
+		BTF_STRUCT_ENC(NAME_TBD, 1, 4),				/* [2] */
+		BTF_MEMBER_ENC(NAME_TBD, 1, 0),
+		BTF_STRUCT_ENC(NAME_TBD, 1, 4),				/* [3] */
+		BTF_MEMBER_ENC(NAME_TBD, 2, 0),
+		BTF_STRUCT_ENC(NAME_TBD, 2, 8),				/* [4] */
+		BTF_MEMBER_ENC(NAME_TBD, 2, 0),
+		BTF_MEMBER_ENC(NAME_TBD, 3, 32),
+		BTF_END_RAW,
+	},
+	BTF_STR_SEC("\0int\0bpf_spin_lock\0val\0inner\0lock\0value\0lock\0nested"),
+	.btf_load_err = true,
+},
+
 {
 	.descr = "struct test repeated fields count overflow",
 	.raw_types = {
-- 
2.53.0