Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/mm/zpool.c b/mm/zpool.c
index 01a771e..8636692 100644
--- a/mm/zpool.c
+++ b/mm/zpool.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * zpool memory storage api
  *
@@ -238,6 +239,22 @@
 }
 
 /**
+ * zpool_malloc_support_movable() - Check if the zpool support
+ * allocate movable memory
+ * @zpool:	The zpool to check
+ *
+ * This returns if the zpool support allocate movable memory.
+ *
+ * Implementations must guarantee this to be thread-safe.
+ *
+ * Returns: true if if the zpool support allocate movable memory, false if not
+ */
+bool zpool_malloc_support_movable(struct zpool *zpool)
+{
+	return zpool->driver->malloc_support_movable;
+}
+
+/**
  * zpool_malloc() - Allocate memory
  * @zpool:	The zpool to allocate from.
  * @size:	The amount of memory to allocate.