From 20b20162e1f3b7e60cf0e79116fb2f3bdef3dc5e Mon Sep 17 00:00:00 2001
From: "Liam R. Howlett" <Liam.Howlett@oracle.com>
Date: Fri, 30 Jan 2026 15:59:21 -0500
Subject: maple_tree: add gap support, slot and pivot sizes for maple copy

Add plumbing work for using maple copy as a normal node for a source of
copy operations.  This is needed later.

Link: https://lkml.kernel.org/r/20260130205935.2559335-17-Liam.Howlett@oracle.com
Signed-off-by: Liam R. Howlett <Liam.Howlett@oracle.com>
Cc: Alice Ryhl <aliceryhl@google.com>
Cc: Andrew Ballance <andrewjballance@gmail.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Christian Kujau <lists@nerdbynature.de>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: SeongJae Park <sj@kernel.org>
Cc: Sidhartha Kumar <sidhartha.kumar@oracle.com>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
 include/linux/maple_tree.h | 1 +
 1 file changed, 1 insertion(+)

(limited to 'include/linux')

diff --git a/include/linux/maple_tree.h b/include/linux/maple_tree.h
index e99e16ac1c6d..db6a02788902 100644
--- a/include/linux/maple_tree.h
+++ b/include/linux/maple_tree.h
@@ -165,6 +165,7 @@ struct maple_copy {
 	} src[4];
 	/* Simulated node */
 	void __rcu *slot[3];
+	unsigned long gap[3];
 	unsigned long min;
 	union {
 		unsigned long pivot[3];
-- 
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