linux-kernel - [PATCH v2 06/29] maple_tree: Make ma_wr_states reliable for reuse in spanning store

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Message-ID: <20260121164526.2093265-7-Liam.Howlett@oracle.com>
Date: Wed, 21 Jan 2026 11:45:03 -0500
From: "Liam R. Howlett" <Liam.Howlett@...cle.com>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: maple-tree@...ts.infradead.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, Suren Baghdasaryan <surenb@...gle.com>,
        Matthew Wilcox <willy@...radead.org>,
        Sidhartha Kumar <sidhartha.kumar@...cle.com>,
        Vlastimil Babka <vbabka@...e.cz>, Alice Ryhl <aliceryhl@...gle.com>,
        Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Arnd Bergmann <arnd@...db.de>, Christian Kujau <lists@...dbynature.de>,
        "Liam R. Howlett" <Liam.Howlett@...cle.com>
Subject: [PATCH v2 06/29] maple_tree: Make ma_wr_states reliable for reuse in spanning store

mas_extend_spanning_null() was not modifying the range min and range max
of the resulting store operation.  The result was that the maple write
state no longer matched what the write was doing.  This was not an issue
as the values were previously not used, but to make the ma_wr_state
usable in future changes, the range min/max stored in the ma_wr_state
for left and right need to be consistent with the operation.

Signed-off-by: Liam R. Howlett <Liam.Howlett@...cle.com>
---
 lib/maple_tree.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/lib/maple_tree.c b/lib/maple_tree.c
index fb14ce4a49c3c..ab14876bebf7c 100644
--- a/lib/maple_tree.c
+++ b/lib/maple_tree.c
@@ -3319,6 +3319,7 @@ static inline void mas_extend_spanning_null(struct ma_wr_state *l_wr_mas,
 			l_mas->index = l_mas->min;
 
 		l_mas->offset = l_slot - 1;
+		l_wr_mas->r_min = l_mas->index;
 	}
 
 	if (!r_wr_mas->content) {
@@ -3331,6 +3332,7 @@ static inline void mas_extend_spanning_null(struct ma_wr_state *l_wr_mas,
 		r_mas->last = mas_safe_pivot(r_mas, r_wr_mas->pivots,
 					     r_wr_mas->type, r_mas->offset + 1);
 		r_mas->offset++;
+		r_wr_mas->r_max = r_mas->last;
 	}
 }
 
-- 
2.47.3