Re: [PATCHv3 bpf-next 5/7] selftests/bpf: Add test for bpf_get_func_ip helper

On Wed, Jul 7, 2021 at 2:54 PM Jiri Olsa [off-list ref] wrote:

Adding test for bpf_get_func_ip helper for fentry, fexit,
kprobe, kretprobe and fmod_ret programs.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
---
 .../bpf/prog_tests/get_func_ip_test.c         | 42 +++++++++++++
 .../selftests/bpf/progs/get_func_ip_test.c    | 62 +++++++++++++++++++
 2 files changed, 104 insertions(+)
 create mode 100644 tools/testing/selftests/bpf/prog_tests/get_func_ip_test.c
 create mode 100644 tools/testing/selftests/bpf/progs/get_func_ip_test.c

[...]

+       ASSERT_OK(err, "test_run");
+
+       result = (__u64 *)skel->bss;
+       for (i = 0; i < sizeof(*skel->bss) / sizeof(__u64); i++) {
+               if (!ASSERT_EQ(result[i], 1, "fentry_result"))
+                       break;
+       }

I dislike such generic loop over results. It's super error prone and
takes the same 5 lines of code that you'd write for explicit

ASSERT_EQ(testX_result, 1, "testX_result"); /* 5 times */

+
+       get_func_ip_test__detach(skel);

no need to explicitly detach, __destroy does that automatically

+
+cleanup:
+       get_func_ip_test__destroy(skel);
+}

[...]