linux-kernel - [PATCH 22/28] maple_tree: Add copy_tree

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Message-ID: <20260115193647.1695937-23-Liam.Howlett@oracle.com>
Date: Thu, 15 Jan 2026 14:36:41 -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 22/28] maple_tree: Add copy_tree_location() helper

Extract the copying of the tree location from one maple state to another
into its own function.  This is used more later.

Signed-off-by: Liam R. Howlett <Liam.Howlett@...cle.com>
---
 lib/maple_tree.c | 18 ++++++++++++------
 1 file changed, 12 insertions(+), 6 deletions(-)

diff --git a/lib/maple_tree.c b/lib/maple_tree.c
index 50e1d9f585502..a6f4a1c8549b5 100644
--- a/lib/maple_tree.c
+++ b/lib/maple_tree.c
@@ -3500,6 +3500,17 @@ static bool spanning_ascend(struct maple_copy *cp, struct ma_state *mas,
 	return true;
 }
 
+static inline
+void copy_tree_location(const struct ma_state *src, struct ma_state *dst)
+{
+	dst->node = src->node;
+	dst->offset = src->offset;
+	dst->min = src->min;
+	dst->max = src->max;
+	dst->end = src->end;
+	dst->depth = src->depth;
+}
+
 /*
  * rebalance_ascend() - Ascend the tree and set up for the next loop - if
  * necessary
@@ -3539,12 +3550,7 @@ static inline bool rebalance_ascend(struct maple_copy *cp,
 	}
 
 	cp->height++;
-	mas->node = parent->node;
-	mas->offset = parent->offset;
-	mas->min = parent->min;
-	mas->max = parent->max;
-	mas->end = parent->end;
-	mas->depth = parent->depth;
+	copy_tree_location(parent, mas);
 	wr_mas_setup(wr_mas, mas);
 	return true;
 }
-- 
2.47.3