Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/fs/btrfs/async-thread.c b/fs/btrfs/async-thread.c
index d522494..2e9e13f 100644
--- a/fs/btrfs/async-thread.c
+++ b/fs/btrfs/async-thread.c
@@ -12,9 +12,11 @@
 #include "async-thread.h"
 #include "ctree.h"
 
-#define WORK_DONE_BIT 0
-#define WORK_ORDER_DONE_BIT 1
-#define WORK_HIGH_PRIO_BIT 2
+enum {
+	WORK_DONE_BIT,
+	WORK_ORDER_DONE_BIT,
+	WORK_HIGH_PRIO_BIT,
+};
 
 #define NO_THRESHOLD (-1)
 #define DFT_THRESHOLD (32)
@@ -139,13 +141,11 @@
 	}
 
 	if (flags & WQ_HIGHPRI)
-		ret->normal_wq = alloc_workqueue("%s-%s-high", flags,
-						 ret->current_active, "btrfs",
-						 name);
+		ret->normal_wq = alloc_workqueue("btrfs-%s-high", flags,
+						 ret->current_active, name);
 	else
-		ret->normal_wq = alloc_workqueue("%s-%s", flags,
-						 ret->current_active, "btrfs",
-						 name);
+		ret->normal_wq = alloc_workqueue("btrfs-%s", flags,
+						 ret->current_active, name);
 	if (!ret->normal_wq) {
 		kfree(ret);
 		return NULL;