selftests/bpf: Fix usdt/basic arg size checks on 32-bit

Tests of bpf_usdt_arg_size() hard-code expected arg sizes and match only
64-bit host systems. Update to instead determine the expected values using
sizeof(<arg type>) and avoid failures on 32-bit systems (e.g. armhf) like:

[...]
subtest_basic_usdt:FAIL:usdt3_arg2_size unexpected usdt3_arg2_size: actual 4 != expected 8
subtest_basic_usdt:FAIL:usdt3_arg3_size unexpected usdt3_arg3_size: actual 4 != expected 8
[...]
subtest_basic_usdt:FAIL:usdt12_arg_size unexpected usdt12_arg_size: actual 4 != expected 8
subtest_basic_usdt:FAIL:usdt12_arg_size unexpected usdt12_arg_size: actual 4 != expected 8
subtest_basic_usdt:PASS:usdt12_arg_size 0 nsec
subtest_basic_usdt:FAIL:usdt12_arg_size unexpected usdt12_arg_size: actual 4 != expected 8
subtest_basic_usdt:PASS:usdt12_arg_size 0 nsec
subtest_basic_usdt:FAIL:usdt12_arg_size unexpected usdt12_arg_size: actual 4 != expected 8
[...]
torvalds#481/1   usdt/basic:FAIL

Fixes: 0ba0ef0 ("selftests/bpf: Test bpf_usdt_arg_size() function")
Signed-off-by: Tony Ambardar <tony.ambardar@gmail.com>

Author: guidosarducci

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

@@ -163,9 +163,9 @@ static void subtest_basic_usdt(bool optimized)
 	ASSERT_EQ(bss->usdt3_args[0], 1, "usdt3_arg1");
 	ASSERT_EQ(bss->usdt3_args[1], 42, "usdt3_arg2");
 	ASSERT_EQ(bss->usdt3_args[2], (uintptr_t)&bla, "usdt3_arg3");
-	ASSERT_EQ(bss->usdt3_arg_sizes[0], 4, "usdt3_arg1_size");
-	ASSERT_EQ(bss->usdt3_arg_sizes[1], 8, "usdt3_arg2_size");
-	ASSERT_EQ(bss->usdt3_arg_sizes[2], 8, "usdt3_arg3_size");
+	ASSERT_EQ(bss->usdt3_arg_sizes[0], sizeof(int), "usdt3_arg1_size");
+	ASSERT_EQ(bss->usdt3_arg_sizes[1], sizeof(long), "usdt3_arg2_size");
+	ASSERT_EQ(bss->usdt3_arg_sizes[2], sizeof(uintptr_t), "usdt3_arg3_size");
 
 	/* auto-attached usdt12 gets default zero cookie value */
 	ASSERT_EQ(bss->usdt12_cookie, 0, "usdt12_cookie");
@@ -184,7 +184,20 @@ static void subtest_basic_usdt(bool optimized)
 	ASSERT_EQ(bss->usdt12_args[10], nums[idx], "usdt12_arg11");
 	ASSERT_EQ(bss->usdt12_args[11], t1.y, "usdt12_arg12");
 
-	int usdt12_expected_arg_sizes[12] = { 4, 4, 8, 8, 4, 8, 8, 8, 4, 2, 2, 1 };
+	int usdt12_expected_arg_sizes[12] = {
+		sizeof(int),
+		sizeof(int),
+		sizeof(long),
+		sizeof(long),
+		sizeof(unsigned),
+		sizeof(long),
+		sizeof(__u64),
+		sizeof(uintptr_t),
+		sizeof(int),
+		sizeof(short),
+		sizeof(short),
+		sizeof(signed char)
+	};
 
 	for (i = 0; i < 12; i++)
 		ASSERT_EQ(bss->usdt12_arg_sizes[i], usdt12_expected_arg_sizes[i], "usdt12_arg_size");