target/linux/generic/backport-5.4/080-wireguard-0077-wireguard-allowedips-use-kfree_rcu-instead-of-call_r.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Wei Yongjun <weiyongjun1@huawei.com>
Date: Sun, 15 Dec 2019 22:08:04 +0100
Subject: [PATCH] wireguard: allowedips: use kfree_rcu() instead of call_rcu()

commit d89ee7d5c73af15c1c6f12b016cdf469742b5726 upstream.

The callback function of call_rcu() just calls a kfree(), so we
can use kfree_rcu() instead of call_rcu() + callback function.

Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
---
 drivers/net/wireguard/allowedips.c | 7 +------
 1 file changed, 1 insertion(+), 6 deletions(-)

--- a/drivers/net/wireguard/allowedips.c
+++ b/drivers/net/wireguard/allowedips.c
@@ -31,11 +31,6 @@ static void copy_and_assign_cidr(struct
 #define CHOOSE_NODE(parent, key) \
 	parent->bit[(key[parent->bit_at_a] >> parent->bit_at_b) & 1]
 
-static void node_free_rcu(struct rcu_head *rcu)
-{
-	kfree(container_of(rcu, struct allowedips_node, rcu));
-}
-
 static void push_rcu(struct allowedips_node **stack,
 		     struct allowedips_node __rcu *p, unsigned int *len)
 {
@@ -112,7 +107,7 @@ static void walk_remove_by_peer(struct a
 				if (!node->bit[0] || !node->bit[1]) {
 					rcu_assign_pointer(*nptr, DEREF(
 					       &node->bit[!REF(node->bit[0])]));
-					call_rcu(&node->rcu, node_free_rcu);
+					kfree_rcu(node, rcu);
 					node = DEREF(nptr);
 				}
 			}