will be stored in a node. Bit 2 is set if there are any NULL entries
in the tree. Bits 3-6 are used to store enum maple_type.
-The flags are used both to store some immutable inforation about this
-tree (set at tree creation time) and dynamic information set under
-the spinlock. Needed flags: irq/bh safe locking, whether to support
-'reserved', whether to track max-range-free, whether to reap nodes which
-only contain value entries, whether slot 0 is busy, how many mark bits
-to support (5 bits), 18 mark bits (total 29 bits).
+The flags are used both to store some immutable information about this tree
+(set at tree creation time) and dynamic information set under the spinlock.
+Needed flags: irq/bh safe locking, whether to support 'reserved', whether to
+track max-range-free, whether to reap nodes which only contain value entries,
+whether slot 0 is busy, how many mark bits to support (5 bits), 18 mark bits
+(total 29 bits).
Node Slots
----------