[PATCH bpf-next 2/3] selftests/bpf: add selftest validating btf_dump's mod-stripping output

[Andrii Nakryiko <andriin@xxxxxx>]

Add selftest validating that .strip_mods=true mode works correctly.

Signed-off-by: Andrii Nakryiko <andriin@xxxxxx>
---
 .../selftests/bpf/prog_tests/btf_dump.c       |  5 +-
 .../bpf/progs/btf_dump_test_case_strip_mods.c | 50 +++++++++++++++++++
 2 files changed, 54 insertions(+), 1 deletion(-)
 create mode 100644 tools/testing/selftests/bpf/progs/btf_dump_test_case_strip_mods.c

diff --git a/tools/testing/selftests/bpf/prog_tests/btf_dump.c b/tools/testing/selftests/bpf/prog_tests/btf_dump.c
index cb33a7ee4e04..112b653b9c80 100644
--- a/tools/testing/selftests/bpf/prog_tests/btf_dump.c
+++ b/tools/testing/selftests/bpf/prog_tests/btf_dump.c
@@ -21,6 +21,8 @@ static struct btf_dump_test_case {
 	{"btf_dump: bitfields", "btf_dump_test_case_bitfields", {}},
 	{"btf_dump: multidim", "btf_dump_test_case_multidim", {}},
 	{"btf_dump: namespacing", "btf_dump_test_case_namespacing", {}},
+	{"btf_dump: strip mods", "btf_dump_test_case_strip_mods",
+	 { .strip_mods = true }},
 };
 
 static int btf_dump_all_types(const struct btf *btf,
@@ -125,6 +127,7 @@ void test_btf_dump() {
 		if (!test__start_subtest(t->name))
 			continue;
 
-		test_btf_dump_case(i, &btf_dump_test_cases[i]);
+		t->opts.sz = sizeof(t->opts);
+		test_btf_dump_case(i, t);
 	}
 }
diff --git a/tools/testing/selftests/bpf/progs/btf_dump_test_case_strip_mods.c b/tools/testing/selftests/bpf/progs/btf_dump_test_case_strip_mods.c
new file mode 100644
index 000000000000..1a6ba26d5d75
--- /dev/null
+++ b/tools/testing/selftests/bpf/progs/btf_dump_test_case_strip_mods.c
@@ -0,0 +1,50 @@
+// SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)
+/* Copyright (c) 2020 Facebook */
+
+struct s {
+	const int a;
+	volatile int * const b;
+	const volatile struct {
+		int * const volatile c1;
+		const int (* const c2)(volatile int x, const void * const y);
+		const volatile int c3[10];
+	} c;
+	const union {
+		const int * restrict d1;
+		const volatile int * const volatile restrict d2;
+	} d[2];
+	const struct {
+		const volatile int *e1[5];
+	} e;
+	const volatile int * const * volatile * restrict *f;
+	const void * volatile * (*g)(const int x, const void * restrict y);
+};
+
+/* ----- START-EXPECTED-OUTPUT ----- */
+/*
+ *struct s {
+ *	int a;
+ *	int *b;
+ *	struct {
+ *		int *c1;
+ *		int (*c2)(int, void *);
+ *		int c3[10];
+ *	} c;
+ *	union {
+ *		int *d1;
+ *		int *d2;
+ *	} d[2];
+ *	struct {
+ *		int *e1[5];
+ *	} e;
+ *	int ****f;
+ *	void ** (*g)(int, void *);
+ *};
+ *
+ */
+/* ------ END-EXPECTED-OUTPUT ------ */
+
+int f(struct s *s)
+{
+	return 0;
+}
-- 
2.24.1