selftests/bpf: do not pass NULL for non-nullable params in dummy_st_ops

dummy_st_ops.test_2 and dummy_st_ops.test_sleepable do not have their
'state' parameter marked as nullable. Update dummy_st_ops.c to avoid
passing NULL for such parameters, as the next patch would allow kernel
to enforce this restriction.

Signed-off-by: Eduard Zingerman <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Alexei Starovoitov <[e-mail]>

tools/testing/selftests/bpf/prog_tests/dummy_st_ops.c

···
 
 static void test_dummy_multiple_args(void)
 {
-	__u64 args[5] = {0, -100, 0x8a5f, 'c', 0x1234567887654321ULL};
+	struct bpf_dummy_ops_state st = { 7 };
+	__u64 args[5] = {(__u64)&st, -100, 0x8a5f, 'c', 0x1234567887654321ULL};
 	LIBBPF_OPTS(bpf_test_run_opts, attr,
 		.ctx_in = args,
 		.ctx_size_in = sizeof(args),
···
 	fd = bpf_program__fd(skel->progs.test_2);
 	err = bpf_prog_test_run_opts(fd, &attr);
 	ASSERT_OK(err, "test_run");
+	args[0] = 7;
 	for (i = 0; i < ARRAY_SIZE(args); i++) {
 		snprintf(name, sizeof(name), "arg %zu", i);
 		ASSERT_EQ(skel->bss->test_2_args[i], args[i], name);
···
 
 static void test_dummy_sleepable(void)
 {
-	__u64 args[1] = {0};
+	struct bpf_dummy_ops_state st;
+	__u64 args[1] = {(__u64)&st};
 	LIBBPF_OPTS(bpf_test_run_opts, attr,
 		.ctx_in = args,
 		.ctx_size_in = sizeof(args),

tools/testing/selftests/bpf/progs/dummy_st_ops_success.c

···
 int BPF_PROG(test_2, struct bpf_dummy_ops_state *state, int a1, unsigned short a2,
 	     char a3, unsigned long a4)
 {
-	test_2_args[0] = (unsigned long)state;
+	test_2_args[0] = state->val;
 	test_2_args[1] = a1;
 	test_2_args[2] = a2;
 	test_2_args[3] = a3;