[PATCH 2/2] maple_tree: Add MAS_UNDERFLOW and MAS_OVERFLOW states

[Matthew Wilcox]

On Thu, Sep 21, 2023 at 02:12:36PM -0400, Liam R. Howlett wrote:
> Since MAS_NONE is used for handling of the maple tree when it's a single
> entry at 0 (just a pointer), changing the handling of MAS_NONE in
> mas_find() would make the code more complicated and error prone.

Single entry at index 0 is MAS_ROOT, not MAS_NONE.