selftests: skip mincore.check_file_mmap when fs lacks needed support

Report mincore.check_file_mmap as SKIP instead of FAIL if the underlying
filesystem lacks support of O_TMPFILE or fallocate since such failures
are not really related to mincore functionality.

Cc: Ricardo Cañuelo <ricardo.canuelo@collabora.com>
Signed-off-by: Cristian Marussi <cristian.marussi@arm.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>

tools/testing/selftests/mincore/mincore_selftest.c

@@ -207,16 +207,22 @@ TEST(check_file_mmap)
 
 	errno = 0;
 	fd = open(".", O_TMPFILE | O_RDWR, 0600);
-	ASSERT_NE(-1, fd) {
+	if (fd < 0) {
+		ASSERT_EQ(errno, EOPNOTSUPP) {
 			TH_LOG("Can't create temporary file: %s",
 			       strerror(errno));
 		}
+		SKIP(goto out_free, "O_TMPFILE not supported by filesystem.");
+	}
 	errno = 0;
 	retval = fallocate(fd, 0, 0, FILE_SIZE);
-	ASSERT_EQ(0, retval) {
+	if (retval) {
+		ASSERT_EQ(errno, EOPNOTSUPP) {
 			TH_LOG("Error allocating space for the temporary file: %s",
 			       strerror(errno));
 		}
+		SKIP(goto out_close, "fallocate not supported by filesystem.");
+	}
 
 	/*
 	 * Map the whole file, the pages shouldn't be fetched yet.
@@ -271,7 +277,9 @@ TEST(check_file_mmap)
 	}
 
 	munmap(addr, FILE_SIZE);
+out_close:
 	close(fd);
+out_free:
 	free(vec);
 }