Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/virt/kvm/async_pf.c b/virt/kvm/async_pf.c
index 23c2519..35305d6 100644
--- a/virt/kvm/async_pf.c
+++ b/virt/kvm/async_pf.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * kvm asynchronous fault support
  *
@@ -5,19 +6,6 @@
  *
  * Author:
  *      Gleb Natapov <gleb@redhat.com>
- *
- * This file is free software; you can redistribute it and/or modify
- * it under the terms of version 2 of the GNU General Public License
- * as published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software Foundation,
- * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
  */
 
 #include <linux/kvm_host.h>
@@ -82,7 +70,7 @@
 	might_sleep();
 
 	/*
-	 * This work is run asynchromously to the task which owns
+	 * This work is run asynchronously to the task which owns
 	 * mm and might be done in another context, so we must
 	 * access remotely.
 	 */