linux-kernel - [PATCH v2 05/14] net/sysctl: Rename kvfree_rcu() to kvfree_rcu

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Date:   Wed, 15 Mar 2023 18:18:52 +0000
From:   "Joel Fernandes (Google)" <joel@...lfernandes.org>
To:     "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>
Cc:     "Uladzislau Rezki (Sony)" <urezki@...il.com>,
        "Paul E . McKenney" <paulmck@...nel.org>,
        Joel Fernandes <joel@...lfernandes.org>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2 05/14] net/sysctl: Rename kvfree_rcu() to kvfree_rcu_mightsleep()

From: "Uladzislau Rezki (Sony)" <urezki@...il.com>

The kfree_rcu() and kvfree_rcu() macros' single-argument forms are
deprecated.  Therefore switch to the new kfree_rcu_mightsleep() and
kvfree_rcu_mightsleep() variants. The goal is to avoid accidental use
of the single-argument forms, which can introduce functionality bugs in
atomic contexts and latency bugs in non-atomic contexts.

Cc: Eric Dumazet <edumazet@...gle.com>
Cc: David S. Miller <davem@...emloft.net>
Signed-off-by: Uladzislau Rezki (Sony) <urezki@...il.com>
Signed-off-by: Paul E. McKenney <paulmck@...nel.org>
Signed-off-by: Joel Fernandes (Google) <joel@...lfernandes.org>
---
 net/core/sysctl_net_core.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/net/core/sysctl_net_core.c b/net/core/sysctl_net_core.c
index 74842b453407..782273bb93c2 100644
--- a/net/core/sysctl_net_core.c
+++ b/net/core/sysctl_net_core.c
@@ -177,7 +177,7 @@ static int rps_sock_flow_sysctl(struct ctl_table *table, int write,
 			if (orig_sock_table) {
 				static_branch_dec(&rps_needed);
 				static_branch_dec(&rfs_needed);
-				kvfree_rcu(orig_sock_table);
+				kvfree_rcu_mightsleep(orig_sock_table);
 			}
 		}
 	}
@@ -215,7 +215,7 @@ static int flow_limit_cpu_sysctl(struct ctl_table *table, int write,
 				     lockdep_is_held(&flow_limit_update_mutex));
 			if (cur && !cpumask_test_cpu(i, mask)) {
 				RCU_INIT_POINTER(sd->flow_limit, NULL);
-				kfree_rcu(cur);
+				kfree_rcu_mightsleep(cur);
 			} else if (!cur && cpumask_test_cpu(i, mask)) {
 				cur = kzalloc_node(len, GFP_KERNEL,
 						   cpu_to_node(i));
-- 
2.40.0.rc1.284.g88254d51c5-goog