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Date:   Thu, 21 Sep 2023 19:40:29 +0100
From:   Matthew Wilcox <willy@infradead.org>
To:     "Liam R. Howlett" <Liam.Howlett@oracle.com>
Cc:     Andrew Morton <akpm@linux-foundation.org>,
        maple-tree@lists.infradead.org, linux-mm@kvack.org,
        linux-kernel@vger.kernel.org, pedro.falcato@gmail.com,
        stable <stable@kernel.org>
Subject: Re: [PATCH 2/2] maple_tree: Add MAS_UNDERFLOW and MAS_OVERFLOW states
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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.