Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/include/linux/raid/md_u.h b/include/linux/raid/md_u.h
index 358c04b..8dfec08 100644
--- a/include/linux/raid/md_u.h
+++ b/include/linux/raid/md_u.h
@@ -1,15 +1,8 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
 /*
    md_u.h : user <=> kernel API between Linux raidtools and RAID drivers
           Copyright (C) 1998 Ingo Molnar
 	  
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU General Public License as published by
-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
-   
-   You should have received a copy of the GNU General Public License
-   (for example /usr/src/linux/COPYING); if not, write to the Free
-   Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  
 */
 #ifndef _MD_U_H
 #define _MD_U_H
diff --git a/include/linux/raid/pq.h b/include/linux/raid/pq.h
index ea85052..0832c9b 100644
--- a/include/linux/raid/pq.h
+++ b/include/linux/raid/pq.h
@@ -1,13 +1,8 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
 /* -*- linux-c -*- ------------------------------------------------------- *
  *
  *   Copyright 2003 H. Peter Anvin - All Rights Reserved
  *
- *   This program is free software; you can redistribute it and/or modify
- *   it under the terms of the GNU General Public License as published by
- *   the Free Software Foundation, Inc., 53 Temple Place Ste 330,
- *   Boston MA 02111-1307, USA; either version 2 of the License, or
- *   (at your option) any later version; incorporated herein by reference.
- *
  * ----------------------------------------------------------------------- */
 
 #ifndef LINUX_RAID_RAID6_H
@@ -35,6 +30,7 @@
 #include <limits.h>
 #include <stddef.h>
 #include <sys/mman.h>
+#include <sys/time.h>
 #include <sys/types.h>
 
 /* Not standard, but glibc defines it */
@@ -52,7 +48,9 @@
 
 #define __init
 #define __exit
-#define __attribute_const__ __attribute__((const))
+#ifndef __attribute_const__
+# define __attribute_const__ __attribute__((const))
+#endif
 #define noinline __attribute__((noinline))
 
 #define preempt_enable()
@@ -67,6 +65,9 @@
 #define MODULE_DESCRIPTION(desc)
 #define subsys_initcall(x)
 #define module_exit(x)
+
+#define IS_ENABLED(x) (x)
+#define CONFIG_RAID6_PQ_BENCHMARK 1
 #endif /* __KERNEL__ */
 
 /* Routine choices */