linux-kernel - [PATCH 2/2] maple_tree: Testing fix for spanning store on 32b

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Message-ID: <20250828003023.418966-3-Liam.Howlett@oracle.com>
Date: Wed, 27 Aug 2025 20:30:23 -0400
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, sidhartha.kumar@...cle.com,
        "Liam R. Howlett" <Liam.Howlett@...cle.com>
Subject: [PATCH 2/2] maple_tree: Testing fix for spanning store on 32b

32 bit nodes have a larger branching factor.  This affects the required
value to cause a height change.  Update the spanning store height test
to work for both 64 and 32 bit nodes.

Signed-off-by: Liam R. Howlett <Liam.Howlett@...cle.com>
---
 tools/testing/radix-tree/maple.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/tools/testing/radix-tree/maple.c b/tools/testing/radix-tree/maple.c
index 90a0db45a33c3..05714c22994ea 100644
--- a/tools/testing/radix-tree/maple.c
+++ b/tools/testing/radix-tree/maple.c
@@ -36327,13 +36327,18 @@ extern void test_kmem_cache_bulk(void);
 static inline void check_spanning_store_height(struct maple_tree *mt)
 {
 	int index = 0;
+	int last = 140;
 	MA_STATE(mas, mt, 0, 0);
 	mas_lock(&mas);
 	while (mt_height(mt) != 3) {
 		mas_store_gfp(&mas, xa_mk_value(index), GFP_KERNEL);
 		mas_set(&mas, ++index);
 	}
-	mas_set_range(&mas, 90, 140);
+
+	if (MAPLE_32BIT)
+		last = 155; /* 32 bit higher branching factor. */
+
+	mas_set_range(&mas, 90, last);
 	mas_store_gfp(&mas, xa_mk_value(index), GFP_KERNEL);
 	MT_BUG_ON(mt, mas_mt_height(&mas) != 2);
 	mas_unlock(&mas);
-- 
2.47.2