[PATCH] selftests/ipc: skip msgque test if MSG_COPY is not supported

[UYeol Jo <jouyeol8739@gmail.com>]

The msgque test uses the MSG_COPY flag, which depends on
CONFIG_CHECKPOINT_RESTORE. On kernels where this option is disabled,
msgrcv() fails with ENOSYS.

Currently, the test reports this as a failure:

Change it to skip the test instead, as the failure is due to missing
kernel configuration rather than a bug in the IPC subsystem.
 # selftests: ipc: msgque
 # not ok 1 Failed to copy IPC message: Function not implemented (38)
 # not ok 2 Failed to dump queue: -38

After this patch, the test reports a skip instead of failure:
1..0 # SKIP MSG_COPY not supported

Signed-off-by: UYeol Jo <jouyeol8739@gmail.com>
---
 tools/testing/selftests/ipc/msgque.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/tools/testing/selftests/ipc/msgque.c b/tools/testing/selftests/ipc/msgque.c
index e107379d185c..82f73cdae120 100644
--- a/tools/testing/selftests/ipc/msgque.c
+++ b/tools/testing/selftests/ipc/msgque.c
@@ -161,6 +161,9 @@ int dump_queue(struct msgque_data *msgque)
 		ret = msgrcv(msgque->msq_id, &msgque->messages[i].mtype,
 				MAX_MSG_SIZE, i, IPC_NOWAIT | MSG_COPY);
 		if (ret < 0) {
+			if (errno == ENOSYS)
+				ksft_exit_skip("MSG_COPY not supported\n");
+
 			ksft_test_result_fail("Failed to copy IPC message: %m (%d)\n", errno);
 			return -errno;
 		}
-- 
2.43.0