Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/lib/locking-selftest.c b/lib/locking-selftest.c
index 1e1bbf1..a170554 100644
--- a/lib/locking-selftest.c
+++ b/lib/locking-selftest.c
@@ -1989,6 +1989,7 @@
 
 	init_shared_classes();
 	debug_locks_silent = !debug_locks_verbose;
+	lockdep_set_selftest_task(current);
 
 	DO_TESTCASE_6R("A-A deadlock", AA);
 	DO_TESTCASE_6R("A-B-B-A deadlock", ABBA);
@@ -2097,5 +2098,6 @@
 		printk("---------------------------------\n");
 		debug_locks = 1;
 	}
+	lockdep_set_selftest_task(NULL);
 	debug_locks_silent = 0;
 }