kselftest: make callers of ksft_exit_skip() output the reason for skipping

Make the three tests that did use the old ksft_ext_skip()
(breakpoints/breakpoint_test_arm64, breakpoints/step_after_suspend_test,
and membarrier_test) use the new one, with an output for the
reason for skipping all the tests.
Signed-off-by: Paul Elder <paul.elder@pitt.edu>
Signed-off-by: Shuah Khan <shuahkh@osg.samsung.com>

tools/testing/selftests/breakpoints/breakpoint_test_arm64.c

@@ -101,9 +101,8 @@ static bool set_watchpoint(pid_t pid, int size, int wp)
 		return true;
 
 	if (errno == EIO) {
-		printf("ptrace(PTRACE_SETREGSET, NT_ARM_HW_WATCH) "
+		ksft_exit_skip("ptrace(PTRACE_SETREGSET, NT_ARM_HW_WATCH) "
 			"not supported on this hardware\n");
-		ksft_exit_skip();
 	}
 	perror("ptrace(PTRACE_SETREGSET, NT_ARM_HW_WATCH) failed");
 	return false;

tools/testing/selftests/breakpoints/step_after_suspend_test.c

@@ -83,8 +83,8 @@ bool run_test(int cpu)
 
 	if (ptrace(PTRACE_SINGLESTEP, pid, NULL, NULL) < 0) {
 		if (errno == EIO) {
-			printf("ptrace(PTRACE_SINGLESTEP) not supported on this architecture\n");
-			ksft_exit_skip();
+			ksft_exit_skip("ptrace(PTRACE_SINGLESTEP) "
+				"not supported on this architecture");
 		}
 		perror("ptrace(PTRACE_SINGLESTEP) failed");
 		return false;

tools/testing/selftests/membarrier/membarrier_test.c

@@ -87,8 +87,7 @@ static enum test_membarrier_status test_membarrier_query(void)
 			 * It is valid to build a kernel with
 			 * CONFIG_MEMBARRIER=n. However, this skips the tests.
 			 */
-			ksft_test_result_skip("CONFIG_MEMBARRIER is not enabled\n");
-			return ksft_exit_skip();
+			ksft_exit_skip("CONFIG_MEMBARRIER is not enabled\n");
 		}
 		ksft_test_result_fail("sys_membarrier() failed\n");
 		return TEST_MEMBARRIER_FAIL;
@@ -108,13 +107,13 @@ int main(int argc, char **argv)
 	case TEST_MEMBARRIER_FAIL:
 		return ksft_exit_fail();
 	case TEST_MEMBARRIER_SKIP:
-		return ksft_exit_skip();
+		return ksft_exit_skip(NULL);
 	}
 	switch (test_membarrier()) {
 	case TEST_MEMBARRIER_FAIL:
 		return ksft_exit_fail();
 	case TEST_MEMBARRIER_SKIP:
-		return ksft_exit_skip();
+		return ksft_exit_skip(NULL);
 	}
 
 	return ksft_exit_pass();