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From: Eric Dumazet <eric.dumazet@gmail.com>
To: Pablo Neira Ayuso <pablo@netfilter.org>,
	Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>,
	Florian Westphal <fw@strlen.de>
Cc: netfilter-devel@vger.kernel.org, netdev <netdev@vger.kernel.org>,
	Eric Dumazet <edumazet@google.com>,
	Eric Dumazet <eric.dumazet@gmail.com>
Subject: [PATCH net] netfilter: nf_tables: prefer kfree_rcu(ptr, rcu) variant
Date: Tue, 22 Feb 2022 10:13:31 -0800	[thread overview]
Message-ID: <20220222181331.811085-1-eric.dumazet@gmail.com> (raw)

From: Eric Dumazet <edumazet@google.com>

While kfree_rcu(ptr) _is_ supported, it has some limitations.

Given that 99.99% of kfree_rcu() users [1] use the legacy
two parameters variant, and @catchall objects do have an rcu head,
simply use it.

Choice of kfree_rcu(ptr) variant was probably not intentional.

[1] including calls from net/netfilter/nf_tables_api.c

Signed-off-by: Eric Dumazet <edumazet@google.com>
---
 net/netfilter/nf_tables_api.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
index 5fa16990da95177791dfaa9e7bb31c92f3cae096..ef79d8d09773588cc399113fd5bcf584c592f039 100644
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -4502,7 +4502,7 @@ static void nft_set_catchall_destroy(const struct nft_ctx *ctx,
 	list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
 		list_del_rcu(&catchall->list);
 		nft_set_elem_destroy(set, catchall->elem, true);
-		kfree_rcu(catchall);
+		kfree_rcu(catchall, rcu);
 	}
 }
 
@@ -5669,7 +5669,7 @@ static void nft_setelem_catchall_remove(const struct net *net,
 	list_for_each_entry_safe(catchall, next, &set->catchall_list, list) {
 		if (catchall->elem == elem->priv) {
 			list_del_rcu(&catchall->list);
-			kfree_rcu(catchall);
+			kfree_rcu(catchall, rcu);
 			break;
 		}
 	}
-- 
2.35.1.473.g83b2b277ed-goog


             reply	other threads:[~2022-02-22 18:13 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-02-22 18:13 Eric Dumazet [this message]
2022-02-22 19:46 ` [PATCH net] netfilter: nf_tables: prefer kfree_rcu(ptr, rcu) variant Florian Westphal
2022-02-22 20:07   ` Eric Dumazet
2022-02-23  8:22     ` Pablo Neira Ayuso

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