diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index 1b18960c9c5d..e3078ed2261b 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -4669,7 +4669,7 @@ static int emit_last_fiemap_cache(struct fiemap_extent_info *fieinfo,
 }
 
 int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
-		__u64 start, __u64 len)
+		  u64 start, u64 len)
 {
 	int ret = 0;
 	u64 off = start;
diff --git a/fs/btrfs/extent_io.h b/fs/btrfs/extent_io.h
index 31c5a6aabd75..00a88f2eb5ab 100644
--- a/fs/btrfs/extent_io.h
+++ b/fs/btrfs/extent_io.h
@@ -204,7 +204,7 @@ int btree_write_cache_pages(struct address_space *mapping,
 			    struct writeback_control *wbc);
 void extent_readahead(struct readahead_control *rac);
 int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
-		__u64 start, __u64 len);
+		  u64 start, u64 len);
 void set_page_extent_mapped(struct page *page);
 
 struct extent_buffer *alloc_extent_buffer(struct btrfs_fs_info *fs_info,
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 6f8c7d65c428..e5feefa20b28 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -7946,7 +7946,7 @@ out:
 }
 
 static int btrfs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
-		__u64 start, __u64 len)
+			u64 start, u64 len)
 {
 	int	ret;