maple_tree: separate ma_state node from status

The maple tree node is overloaded to keep status as well as the active
node.  This, unfortunately, results in a re-walk on underflow or overflow.
Since the maple state has room, the status can be placed in its own enum
in the structure.  Once an underflow/overflow is detected, certain modes
can restore the status to active and others may need to re-walk just that
one node to see the entry.

The status being an enum has the benefit of detecting unhandled status in
switch statements.

[[email protected]: fix comments about MAS_*]
  Link: https://lkml.kernel.org/r/[email protected]
[[email protected]: update forking to separate maple state and node]
  Link: https://lkml.kernel.org/r/[email protected]
[[email protected]: fix mas_prev() state separation code]
  Link: https://lkml.kernel.org/r/[email protected]
Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Liam R. Howlett <[email protected]>
Cc: Peng Zhang <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

0 files changed, 0 insertions, 0 deletions