netdev - [PATCH v1 net-next 1/2] rtnetlink: Add rtnl_net_lock

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Message-ID: <20250104082149.48493-2-kuniyu@amazon.com>
Date: Sat, 4 Jan 2025 17:21:48 +0900
From: Kuniyuki Iwashima <kuniyu@...zon.com>
To: "David S. Miller" <davem@...emloft.net>, Eric Dumazet
	<edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, Paolo Abeni
	<pabeni@...hat.com>, Simon Horman <horms@...nel.org>
CC: Kuniyuki Iwashima <kuniyu@...zon.com>, Kuniyuki Iwashima
	<kuni1840@...il.com>, <netdev@...r.kernel.org>
Subject: [PATCH v1 net-next 1/2] rtnetlink: Add rtnl_net_lock_killable().

rtnl_lock_killable() is used only in register_netdev()
and will be converted to per-netns RTNL.

Let's unexport it and add the corresponding helper.

Signed-off-by: Kuniyuki Iwashima <kuniyu@...zon.com>
---
 include/linux/rtnetlink.h |  6 ++++++
 net/core/rtnetlink.c      | 11 ++++++++++-
 2 files changed, 16 insertions(+), 1 deletion(-)

diff --git a/include/linux/rtnetlink.h b/include/linux/rtnetlink.h
index 3b9d132cbc9e..4bc2ee0b10b0 100644
--- a/include/linux/rtnetlink.h
+++ b/include/linux/rtnetlink.h
@@ -102,6 +102,7 @@ void __rtnl_net_unlock(struct net *net);
 void rtnl_net_lock(struct net *net);
 void rtnl_net_unlock(struct net *net);
 int rtnl_net_trylock(struct net *net);
+int rtnl_net_lock_killable(struct net *net);
 int rtnl_net_lock_cmp_fn(const struct lockdep_map *a, const struct lockdep_map *b);
 
 bool rtnl_net_is_locked(struct net *net);
@@ -138,6 +139,11 @@ static inline int rtnl_net_trylock(struct net *net)
 	return rtnl_trylock();
 }
 
+static inline int rtnl_net_lock_killable(struct net *net)
+{
+	return rtnl_lock_killable();
+}
+
 static inline void ASSERT_RTNL_NET(struct net *net)
 {
 	ASSERT_RTNL();
diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index 6b745096809d..1f4d4b5570ab 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -84,7 +84,6 @@ int rtnl_lock_killable(void)
 {
 	return mutex_lock_killable(&rtnl_mutex);
 }
-EXPORT_SYMBOL(rtnl_lock_killable);
 
 static struct sk_buff *defer_kfree_skb_list;
 void rtnl_kfree_skbs(struct sk_buff *head, struct sk_buff *tail)
@@ -221,6 +220,16 @@ int rtnl_net_trylock(struct net *net)
 }
 EXPORT_SYMBOL(rtnl_net_trylock);
 
+int rtnl_net_lock_killable(struct net *net)
+{
+	int ret = rtnl_lock_killable();
+
+	if (!ret)
+		__rtnl_net_lock(net);
+
+	return ret;
+}
+
 static int rtnl_net_cmp_locks(const struct net *net_a, const struct net *net_b)
 {
 	if (net_eq(net_a, net_b))
-- 
2.39.5 (Apple Git-154)