linux-kernel - Re: [PATCH 2/2] maple_tree: Add MAS_UNDERFLOW and MAS

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Message-ID: <ZQyOHcQFhHqO7JAY@casper.infradead.org>
Date:   Thu, 21 Sep 2023 19:40:29 +0100
From:   Matthew Wilcox <willy@...radead.org>
To:     "Liam R. Howlett" <Liam.Howlett@...cle.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        maple-tree@...ts.infradead.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, pedro.falcato@...il.com,
        stable <stable@...nel.org>
Subject: Re: [PATCH 2/2] maple_tree: Add MAS_UNDERFLOW and MAS_OVERFLOW states

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.