Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/drivers/sbus/Makefile b/drivers/sbus/Makefile
index e94dc25..5c56763 100644
--- a/drivers/sbus/Makefile
+++ b/drivers/sbus/Makefile
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0-only
 #
 # Makefile for the linux kernel.
 #
diff --git a/drivers/sbus/char/Kconfig b/drivers/sbus/char/Kconfig
index 89edd13..cebfbbb 100644
--- a/drivers/sbus/char/Kconfig
+++ b/drivers/sbus/char/Kconfig
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0-only
 
 menu "Misc Linux/SPARC drivers"
 
diff --git a/drivers/sbus/char/bbc_envctrl.c b/drivers/sbus/char/bbc_envctrl.c
index fb5bcf6..4f2dd21 100644
--- a/drivers/sbus/char/bbc_envctrl.c
+++ b/drivers/sbus/char/bbc_envctrl.c
@@ -571,9 +571,9 @@
 	int devidx = 0;
 
 	while ((op = bbc_i2c_getdev(bp, devidx++)) != NULL) {
-		if (!strcmp(op->dev.of_node->name, "temperature"))
+		if (of_node_name_eq(op->dev.of_node, "temperature"))
 			attach_one_temp(bp, op, temp_index++);
-		if (!strcmp(op->dev.of_node->name, "fan-control"))
+		if (of_node_name_eq(op->dev.of_node, "fan-control"))
 			attach_one_fan(bp, op, fan_index++);
 	}
 	if (temp_index != 0 && fan_index != 0) {
diff --git a/drivers/sbus/char/bbc_i2c.c b/drivers/sbus/char/bbc_i2c.c
index 129967a..537e55c 100644
--- a/drivers/sbus/char/bbc_i2c.c
+++ b/drivers/sbus/char/bbc_i2c.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /* bbc_i2c.c: I2C low-level driver for BBC device on UltraSPARC-III
  *            platforms.
  *
diff --git a/drivers/sbus/char/display7seg.c b/drivers/sbus/char/display7seg.c
index a36e4cf..971fe07 100644
--- a/drivers/sbus/char/display7seg.c
+++ b/drivers/sbus/char/display7seg.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /* display7seg.c - Driver implementation for the 7-segment display
  *                 present on Sun Microsystems CP1400 and CP1500
  *
diff --git a/drivers/sbus/char/envctrl.c b/drivers/sbus/char/envctrl.c
index b848192..a63d5e4 100644
--- a/drivers/sbus/char/envctrl.c
+++ b/drivers/sbus/char/envctrl.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /* envctrl.c: Temperature and Fan monitoring on Machines providing it.
  *
  * Copyright (C) 1998  Eddie C. Dost  (ecd@skynet.be)
@@ -906,7 +907,7 @@
 		int len;
 
 		root_node = of_find_node_by_path("/");
-		if (!strcmp(root_node->name, "SUNW,UltraSPARC-IIi-cEngine")) {
+		if (of_node_name_eq(root_node, "SUNW,UltraSPARC-IIi-cEngine")) {
 			for (len = 0; len < PCF8584_MAX_CHANNELS; ++len) {
 				pchild->mon_type[len] = ENVCTRL_NOMON;
 			}
@@ -1039,10 +1040,10 @@
 	index = 0;
 	dp = op->dev.of_node->child;
 	while (dp) {
-		if (!strcmp(dp->name, "gpio")) {
+		if (of_node_name_eq(dp, "gpio")) {
 			i2c_childlist[index].i2ctype = I2C_GPIO;
 			envctrl_init_i2c_child(dp, &(i2c_childlist[index++]));
-		} else if (!strcmp(dp->name, "adc")) {
+		} else if (of_node_name_eq(dp, "adc")) {
 			i2c_childlist[index].i2ctype = I2C_ADC;
 			envctrl_init_i2c_child(dp, &(i2c_childlist[index++]));
 		}
diff --git a/drivers/sbus/char/flash.c b/drivers/sbus/char/flash.c
index a610b8d..e85a05a 100644
--- a/drivers/sbus/char/flash.c
+++ b/drivers/sbus/char/flash.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /* flash.c: Allow mmap access to the OBP Flash, for OBP updates.
  *
  * Copyright (C) 1997  Eddie C. Dost  (ecd@skynet.be)
@@ -165,9 +166,9 @@
 
 	parent = dp->parent;
 
-	if (strcmp(parent->name, "sbus") &&
-	    strcmp(parent->name, "sbi") &&
-	    strcmp(parent->name, "ebus"))
+	if (!of_node_name_eq(parent, "sbus") &&
+	    !of_node_name_eq(parent, "sbi") &&
+	    !of_node_name_eq(parent, "ebus"))
 		return -ENODEV;
 
 	flash.read_base = op->resource[0].start;
diff --git a/drivers/sbus/char/openprom.c b/drivers/sbus/char/openprom.c
index 050879a..30b9751 100644
--- a/drivers/sbus/char/openprom.c
+++ b/drivers/sbus/char/openprom.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Linux/SPARC PROM Configuration Driver
  * Copyright (C) 1996 Thomas K. Dyas (tdyas@noc.rutgers.edu)
@@ -14,20 +15,6 @@
  * sanity's sake.
  */
 
-/* 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 of the
- * License, or (at your option) any later version.
- *
- * 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., 675 Mass Ave, Cambridge, MA 02139, USA. 
- */
 
 #include <linux/module.h>
 #include <linux/kernel.h>
diff --git a/drivers/sbus/char/oradax.c b/drivers/sbus/char/oradax.c
index 6516bc3..8af2162 100644
--- a/drivers/sbus/char/oradax.c
+++ b/drivers/sbus/char/oradax.c
@@ -1,18 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (c) 2017, Oracle and/or its affiliates. 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, either version 2 of the License, or
- * (at your option) any later version.
- *
- * 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, see <http://www.gnu.org/licenses/>.
  */
 
 /*
@@ -30,7 +18,7 @@
  * the recommended way for applications to use the coprocessor, and
  * the driver interface is not intended for general use.
  *
- * See Documentation/sparc/oradax/oracle-dax.txt for more details.
+ * See Documentation/sparc/oradax/oracle-dax.rst for more details.
  */
 
 #include <linux/uaccess.h>
@@ -437,7 +425,7 @@
 
 	dax_dbg("uva %p", va);
 
-	ret = get_user_pages_fast((unsigned long)va, 1, 1, p);
+	ret = get_user_pages_fast((unsigned long)va, 1, FOLL_WRITE, p);
 	if (ret == 1) {
 		dax_dbg("locked page %p, for VA %p", *p, va);
 		return 0;
diff --git a/drivers/sbus/char/uctrl.c b/drivers/sbus/char/uctrl.c
index 0a50133..7173a2e 100644
--- a/drivers/sbus/char/uctrl.c
+++ b/drivers/sbus/char/uctrl.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /* uctrl.c: TS102 Microcontroller interface on Tadpole Sparcbook 3
  *
  * Copyright 1999 Derrick J Brashear (shadow@dementia.org)