linux-kernel - [PATCH 2/2] testing/radix-tree/maple: Hack around kfree

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Message-ID: <20250718172138.103116-2-pfalcato@suse.de>
Date: Fri, 18 Jul 2025 18:21:37 +0100
From: Pedro Falcato <pfalcato@...e.de>
To: Andrew Morton <akpm@...ux-foundation.org>,
	"Liam R. Howlett" <Liam.Howlett@...cle.com>,
	Matthew Wilcox <willy@...radead.org>
Cc: maple-tree@...ts.infradead.org,
	linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	Pedro Falcato <pfalcato@...e.de>
Subject: [PATCH 2/2] testing/radix-tree/maple: Hack around kfree_rcu not existing

liburcu doesn't have kfree_rcu (or anything similar). Despite that, we
can hack around it in a trivial fashion, by adding a wrapper.

This wrapper only works for maple_nodes, and not anything else (due to
us not being able to know rcu_head offsets in any way), and thus we take
advantage of the type checking to avoid future silent breakage.

Signed-off-by: Pedro Falcato <pfalcato@...e.de>
---
 tools/testing/radix-tree/maple.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/tools/testing/radix-tree/maple.c b/tools/testing/radix-tree/maple.c
index 172700fb7784..bfdc93c36cf9 100644
--- a/tools/testing/radix-tree/maple.c
+++ b/tools/testing/radix-tree/maple.c
@@ -23,6 +23,23 @@
 #define MODULE_LICENSE(x)
 #define dump_stack()	assert(0)
 
+
+#include <linux/maple_tree.h>
+
+static void free_node(struct rcu_head *head)
+{
+	struct maple_node *node = container_of(head, struct maple_node, rcu);
+
+	free(node);
+}
+
+static void kfree_rcu_node(struct maple_node *node)
+{
+	call_rcu(&node->rcu, free_node);
+}
+
+#define kfree_rcu(ptr, memb) kfree_rcu_node(ptr)
+
 #include "../../../lib/maple_tree.c"
 #include "../../../lib/test_maple_tree.c"
 
-- 
2.50.1