[PATCH v2] wireguard: allowedips: Use kfree_rcu() instead of call_rcu()

Fushuai Wang
2025-11-19T14:47:53Z

Replace call_rcu() + kmem_cache_free() with kfree_rcu() to simplify
the code and reduce function size.

Signed-off-by: Fushuai Wang <wangfushuai@baidu.com>
---
drivers/net/wireguard/allowedips.c | 9 ++-------
1 file changed, 2 insertions(+), 7 deletions(-)

diff --git a/drivers/net/wireguard/allowedips.c b/drivers/net/wireguard/allowedips.c
index 09f7fcd7da78..5ece9acad64d 100644
--- a/drivers/net/wireguard/allowedips.c
+++ b/drivers/net/wireguard/allowedips.c
@@ -48,11 +48,6 @@ static void push_rcu(struct allowedips_node **stack,
}
}

-static void node_free_rcu(struct rcu_head *rcu)
-{
- kmem_cache_free(node_cache, container_of(rcu, struct allowedips_node, rcu));
-}
-
static void root_free_rcu(struct rcu_head *rcu)
{
struct allowedips_node *node, *stack[MAX_ALLOWEDIPS_DEPTH] = {
@@ -271,13 +266,13 @@ static void remove_node(struct allowedips_node *node, struct mutex *lock)
if (free_parent)
child = rcu_dereference_protected(parent->bit[!(node->parent_bit_packed & 1)],
lockdep_is_held(lock));
- call_rcu(&node->rcu, node_free_rcu);
+ kfree_rcu(node, rcu);
if (!free_parent)
return;
if (child)
child->parent_bit_packed = parent->parent_bit_packed;
*(struct allowedips_node **)(parent->parent_bit_packed & ~3UL) = child;
- call_rcu(&parent->rcu, node_free_rcu);
+ kfree_rcu(parent, rcu);
}

static int remove(struct allowedips_node __rcu **trie, u8 bits, const u8 *key,
--
2.36.1