linux-kernel - [PATCH 06/12] testing/radix-tree/maple: Hack around kfree

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Message-Id: <20250901-maple-sheaves-v1-6-d6a1166b53f2@suse.cz>
Date: Mon, 01 Sep 2025 13:08:56 +0200
From: Vlastimil Babka <vbabka@...e.cz>
To: "Liam R. Howlett" <Liam.Howlett@...cle.com>, 
 Matthew Wilcox <willy@...radead.org>, 
 Lorenzo Stoakes <lorenzo.stoakes@...cle.com>, Jann Horn <jannh@...gle.com>, 
 Pedro Falcato <pfalcato@...e.de>, Suren Baghdasaryan <surenb@...gle.com>
Cc: Harry Yoo <harry.yoo@...cle.com>, 
 Andrew Morton <akpm@...ux-foundation.org>, maple-tree@...ts.infradead.org, 
 linux-mm@...ck.org, linux-fsdevel@...r.kernel.org, 
 linux-kernel@...r.kernel.org, Vlastimil Babka <vbabka@...e.cz>
Subject: [PATCH 06/12] testing/radix-tree/maple: Hack around kfree_rcu not
 existing

From: "Liam R. Howlett" <Liam.Howlett@...cle.com>

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

The wrapper only works for maple_nodes because we cannot get the
kmem_cache pointer any other way in the test code.

Link: https://lore.kernel.org/all/20250812162124.59417-1-pfalcato@suse.de/
Suggested-by: Pedro Falcato <pfalcato@...e.de>
Signed-off-by: Liam R. Howlett <Liam.Howlett@...cle.com>
Signed-off-by: Vlastimil Babka <vbabka@...e.cz>
---
 tools/testing/radix-tree/maple.c    |  3 +--
 tools/testing/shared/maple-shared.h | 11 +++++++++++
 tools/testing/shared/maple-shim.c   |  6 ++++++
 3 files changed, 18 insertions(+), 2 deletions(-)

diff --git a/tools/testing/radix-tree/maple.c b/tools/testing/radix-tree/maple.c
index 18db97a916f039bf72046c3ec3e7faffaeb5b755..7fe91f24849b35723ec6aadbe45ec7d2abedcc11 100644
--- a/tools/testing/radix-tree/maple.c
+++ b/tools/testing/radix-tree/maple.c
@@ -15,10 +15,9 @@
 #define MODULE_LICENSE(x)
 #define dump_stack()	assert(0)

-#include "maple-shared.h"
 #include "test.h"

-#include "../../../lib/maple_tree.c"
+#include "../shared/maple-shim.c"
 #include "../../../lib/test_maple_tree.c"

 #define RCU_RANGE_COUNT 1000
diff --git a/tools/testing/shared/maple-shared.h b/tools/testing/shared/maple-shared.h
index dc4d30f3860b9bd23b4177c7d7926ac686887815..2a1e9a8594a2834326cd9374738b2a2c7c3f9f7c 100644
--- a/tools/testing/shared/maple-shared.h
+++ b/tools/testing/shared/maple-shared.h
@@ -10,4 +10,15 @@
 #include <time.h>
 #include "linux/init.h"

+void maple_rcu_cb(struct rcu_head *head);
+#define rcu_cb		maple_rcu_cb
+
+#define kfree_rcu(_struct, _memb)		\
+do {                                            \
+    typeof(_struct) _p_struct = (_struct);      \
+                                                \
+    call_rcu(&((_p_struct)->_memb), rcu_cb);    \
+} while(0);
+
+
 #endif /* __MAPLE_SHARED_H__ */
diff --git a/tools/testing/shared/maple-shim.c b/tools/testing/shared/maple-shim.c
index 9d7b743415660305416e972fa75b56824211b0eb..16252ee616c0489c80490ff25b8d255427bf9fdc 100644
--- a/tools/testing/shared/maple-shim.c
+++ b/tools/testing/shared/maple-shim.c
@@ -6,3 +6,9 @@
 #include <linux/slab.h>

 #include "../../../lib/maple_tree.c"
+
+void maple_rcu_cb(struct rcu_head *head) {
+	struct maple_node *node = container_of(head, struct maple_node, rcu);
+
+	kmem_cache_free(maple_node_cache, node);
+}

-- 
2.51.0