diff --git a/fs/btrfs/subpage.c b/fs/btrfs/subpage.c
index 1b999c6e4193..b98d42ca5564 100644
--- a/fs/btrfs/subpage.c
+++ b/fs/btrfs/subpage.c
@@ -713,8 +713,14 @@ void btrfs_page_unlock_writer(struct btrfs_fs_info *fs_info, struct page *page,
 }
 
 #define GET_SUBPAGE_BITMAP(subpage, subpage_info, name, dst)		\
-	bitmap_cut(dst, subpage->bitmaps, 0,				\
-		   subpage_info->name##_offset, subpage_info->bitmap_nr_bits)
+{									\
+	const int bitmap_nr_bits = subpage_info->bitmap_nr_bits;	\
+									\
+	ASSERT(bitmap_nr_bits < BITS_PER_LONG);				\
+	*dst = bitmap_read(subpage->bitmaps,				\
+			   subpage_info->name##_offset,			\
+			   bitmap_nr_bits);				\
+}
 
 void __cold btrfs_subpage_dump_bitmap(const struct btrfs_fs_info *fs_info,
 				      struct page *page, u64 start, u32 len)