-static const u16 BTREE_ITER_IS_EXTENTS = 1 << 4;
-static const u16 BTREE_ITER_NOT_EXTENTS = 1 << 5;
-static const u16 BTREE_ITER_CACHED = 1 << 6;
-static const u16 BTREE_ITER_WITH_KEY_CACHE = 1 << 7;
-static const u16 BTREE_ITER_WITH_UPDATES = 1 << 8;
-static const u16 BTREE_ITER_WITH_JOURNAL = 1 << 9;
-static const u16 __BTREE_ITER_ALL_SNAPSHOTS = 1 << 10;
-static const u16 BTREE_ITER_ALL_SNAPSHOTS = 1 << 11;
-static const u16 BTREE_ITER_FILTER_SNAPSHOTS = 1 << 12;
-static const u16 BTREE_ITER_NOPRESERVE = 1 << 13;
-static const u16 BTREE_ITER_CACHED_NOFILL = 1 << 14;
-static const u16 BTREE_ITER_KEY_CACHE_FILL = 1 << 15;
-#define __BTREE_ITER_FLAGS_END 16
+static const __maybe_unused u16 BTREE_ITER_IS_EXTENTS = 1 << 4;
+static const __maybe_unused u16 BTREE_ITER_NOT_EXTENTS = 1 << 5;
+static const __maybe_unused u16 BTREE_ITER_CACHED = 1 << 6;
+static const __maybe_unused u16 BTREE_ITER_WITH_KEY_CACHE = 1 << 7;
+static const __maybe_unused u16 BTREE_ITER_WITH_UPDATES = 1 << 8;
+static const __maybe_unused u16 BTREE_ITER_WITH_JOURNAL = 1 << 9;
+static const __maybe_unused u16 __BTREE_ITER_ALL_SNAPSHOTS = 1 << 10;
+static const __maybe_unused u16 BTREE_ITER_ALL_SNAPSHOTS = 1 << 11;
+static const __maybe_unused u16 BTREE_ITER_FILTER_SNAPSHOTS = 1 << 12;
+static const __maybe_unused u16 BTREE_ITER_NOPRESERVE = 1 << 13;
+static const __maybe_unused u16 BTREE_ITER_CACHED_NOFILL = 1 << 14;
+static const __maybe_unused u16 BTREE_ITER_KEY_CACHE_FILL = 1 << 15;
+#define __BTREE_ITER_FLAGS_END 16