[PATCH bpf-next 5/5] selftests/bpf: Improve readability in iter test for percpu data

[Leon Hwang <leon.hwang@linux.dev>]

The original 'offsetof()' + offset is equal to the new 'offsetof()'. Use
the new 'offsetof()' instead.

Rename two variables btw:

* offsetof_num -> num_off
* percpu_data_sum -> sum

Signed-off-by: Leon Hwang <leon.hwang@linux.dev>
---
 tools/testing/selftests/bpf/prog_tests/global_data_init.c   | 6 +++---
 tools/testing/selftests/bpf/progs/test_global_percpu_data.c | 6 +++---
 2 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/tools/testing/selftests/bpf/prog_tests/global_data_init.c b/tools/testing/selftests/bpf/prog_tests/global_data_init.c
index 2f0dbeb88934..c6d055b9457d 100644
--- a/tools/testing/selftests/bpf/prog_tests/global_data_init.c
+++ b/tools/testing/selftests/bpf/prog_tests/global_data_init.c
@@ -348,8 +348,8 @@ static void test_global_percpu_data_iter(void)
 		return;
 
 	skel->rodata->num_cpus = num_cpus;
-	skel->rodata->offsetof_num = offsetof(struct test_global_percpu_data__percpu, struct_data);
-	skel->rodata->offsetof_num += sizeof(skel->percpu->struct_data) - sizeof(int);
+	skel->rodata->num_off = offsetof(struct test_global_percpu_data__percpu,
+					 struct_data.nums[6]);
 	skel->rodata->elem_sz = roundup(sizeof(struct test_global_percpu_data__percpu), 8);
 	skel->percpu->struct_data.nums[6] = 0xc0de;
 
@@ -372,7 +372,7 @@ static void test_global_percpu_data_iter(void)
 		do { } while (0);
 	ASSERT_EQ(len, 0, "read iter");
 	ASSERT_TRUE(skel->bss->run_iter, "run_iter");
-	ASSERT_EQ(skel->bss->percpu_data_sum, 0xc0de * num_cpus, "percpu_data_sum");
+	ASSERT_EQ(skel->bss->sum, 0xc0de * num_cpus, "sum");
 
 	close(fd);
 out:
diff --git a/tools/testing/selftests/bpf/progs/test_global_percpu_data.c b/tools/testing/selftests/bpf/progs/test_global_percpu_data.c
index 12556590b647..175c44000753 100644
--- a/tools/testing/selftests/bpf/progs/test_global_percpu_data.c
+++ b/tools/testing/selftests/bpf/progs/test_global_percpu_data.c
@@ -64,9 +64,9 @@ int verifier_snprintf(void *ctx)
 }
 
 volatile const __u32 num_cpus = 0;
-volatile const int offsetof_num;
+volatile const int num_off;
 volatile const int elem_sz;
-__u32 percpu_data_sum = 0;
+__u32 sum = 0;
 bool run_iter = false;
 
 SEC("iter/bpf_map_elem")
@@ -82,7 +82,7 @@ int dump_percpu_data(struct bpf_iter__bpf_map_elem *ctx)
 	run_iter = true;
 
 	for (i = 0; i < num_cpus; i++) {
-		percpu_data_sum += *(int *) (pptr + offsetof_num);
+		sum += *(int *) (pptr + num_off);
 		pptr += elem_sz;
 	}
 	return 0;
-- 
2.55.0