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-rw-r--r--fs/btrfs/extent_map.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/btrfs/extent_map.h b/fs/btrfs/extent_map.h
index cd1a9115908d..44dc0cb310ea 100644
--- a/fs/btrfs/extent_map.h
+++ b/fs/btrfs/extent_map.h
@@ -64,7 +64,7 @@ static inline int extent_map_in_tree(const struct extent_map *em)
return !RB_EMPTY_NODE(&em->rb_node);
}
-static inline u64 extent_map_end(struct extent_map *em)
+static inline u64 extent_map_end(const struct extent_map *em)
{
if (em->start + em->len < em->start)
return (u64)-1;