Add a regression test for a nested struct whose first member is zero and second member is non-zero.
This verifies that struct and union zero detection continues checking later members instead of treating the entire nested value as zero. Signed-off-by: Luis Vieira <[email protected]> --- tools/testing/selftests/bpf/prog_tests/btf_dump.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/tools/testing/selftests/bpf/prog_tests/btf_dump.c b/tools/testing/selftests/bpf/prog_tests/btf_dump.c index 17fa44cb9c91..5a5ee001ac8b 100644 --- a/tools/testing/selftests/bpf/prog_tests/btf_dump.c +++ b/tools/testing/selftests/bpf/prog_tests/btf_dump.c @@ -1146,6 +1146,11 @@ static void test_btf_dump_struct_data(struct btf *btf, struct btf_dump *d, "(union bpf_iter_link_info){.map = (struct){.map_fd = (__u32)1,},.cgroup = (struct){.order = (enum bpf_cgroup_iter_order)BPF_CGROUP_ITER_SELF_ONLY,.cgroup_fd = (__u32)1,},.task = (struct){.tid = (__u32)1,.pid = (__u32)1,},}", { .cgroup = { .order = 1, .cgroup_fd = 1, }}); + /* nested structs with zero first member and non-zero second member */ + TEST_BTF_DUMP_DATA(btf, d, "union", str, union bpf_iter_link_info, BTF_F_COMPACT, + "(union bpf_iter_link_info){.cgroup = (struct){.cgroup_fd = (__u32)1,},.task = (struct){.pid = (__u32)1,},}", + { .cgroup = { .cgroup_fd = 1 }}); + /* struct skb with nested structs/unions; because type output is so * complex, we don't do a string comparison, just verify we return * the type size as the amount of data displayed. -- 2.43.0
