Merge 0401bbf56d into 2004cef11e

Made two changes:
1. ARM64 now defaults to hard reboot on kernel panic.
2. reboot_default` flag is now a boolean for better clarity.

kernel/reboot.c

@@ -34,7 +34,11 @@ EXPORT_SYMBOL(cad_pid);
 #endif
 enum reboot_mode reboot_mode DEFAULT_REBOOT_MODE;
 EXPORT_SYMBOL_GPL(reboot_mode);
+#if defined(CONFIG_ARM64)
+enum reboot_mode panic_reboot_mode = REBOOT_HARD;
+#else
 enum reboot_mode panic_reboot_mode = REBOOT_UNDEFINED;
+#endif
 
 /*
  * This variable is used privately to keep track of whether or not
@@ -43,7 +47,7 @@ enum reboot_mode panic_reboot_mode = REBOOT_UNDEFINED;
  * suppress DMI scanning for reboot quirks.  Without it, it's
  * impossible to override a faulty reboot quirk without recompiling.
  */
-int reboot_default = 1;
+bool reboot_default = true;
 int reboot_cpu;
 enum reboot_type reboot_type = BOOT_ACPI;
 int reboot_force;
@@ -1016,10 +1020,10 @@ static int __init reboot_setup(char *str)
 
 		/*
 		 * Having anything passed on the command line via
-		 * reboot= will cause us to disable DMI checking
+		 * reboot= will cause us to skip DMI checking
 		 * below.
 		 */
-		reboot_default = 0;
+		reboot_default = false;
 
 		if (!strncmp(str, "panic_", 6)) {
 			mode = &panic_reboot_mode;
@@ -1151,7 +1155,7 @@ static ssize_t mode_store(struct kobject *kobj, struct kobj_attribute *attr,
 	else
 		return -EINVAL;
 
-	reboot_default = 0;
+	reboot_default = false;
 
 	return count;
 }
@@ -1173,7 +1177,7 @@ static ssize_t force_store(struct kobject *kobj, struct kobj_attribute *attr,
 	if (kstrtobool(buf, &res))
 		return -EINVAL;
 
-	reboot_default = 0;
+	reboot_default = false;
 	reboot_force = res;
 
 	return count;
@@ -1230,7 +1234,7 @@ static ssize_t type_store(struct kobject *kobj, struct kobj_attribute *attr,
 	else
 		return -EINVAL;
 
-	reboot_default = 0;
+	reboot_default = false;
 
 	return count;
 }
@@ -1259,7 +1263,7 @@ static ssize_t cpu_store(struct kobject *kobj, struct kobj_attribute *attr,
 	if (cpunum >= num_possible_cpus())
 		return -ERANGE;
 
-	reboot_default = 0;
+	reboot_default = false;
 	reboot_cpu = cpunum;
 
 	return count;