linux-kernel - [PATCH 29/30] net: Add missing annotation for netlink_walk

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Message-Id: <20200214204741.94112-30-jbi.octave@gmail.com>
Date:   Fri, 14 Feb 2020 20:47:40 +0000
From:   Jules Irenge <jbi.octave@...il.com>
To:     linux-kernel@...r.kernel.org
Cc:     boqun.feng@...il.com, Jules Irenge <jbi.octave@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Patrick Talbert <ptalbert@...hat.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Taehee Yoo <ap420073@...il.com>,
        Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>,
        Li RongQing <lirongqing@...du.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        netdev@...r.kernel.org (open list:NETWORKING [GENERAL])
Subject: [PATCH 29/30] net: Add missing annotation for netlink_walk_start()

Sparse reports a warning at netlink_walk_start()

warning: context imbalance in netlink_walk_start()
	 - wrong count at exit

The root cause is the missing annotation at netlink_walk_start()
A close look at rhashtable_walk_start_check()
shows that an __acquires(RCU) is needed here.

Add the missing __acquires(RCU) annotation

Signed-off-by: Jules Irenge <jbi.octave@...il.com>
---
 net/netlink/af_netlink.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/netlink/af_netlink.c b/net/netlink/af_netlink.c
index 4e31721e7293..a3fddc845538 100644
--- a/net/netlink/af_netlink.c
+++ b/net/netlink/af_netlink.c
@@ -2539,7 +2539,7 @@ struct nl_seq_iter {
 	int link;
 };
 
-static void netlink_walk_start(struct nl_seq_iter *iter)
+static void netlink_walk_start(struct nl_seq_iter *iter) __acquires(RCU)
 {
 	rhashtable_walk_enter(&nl_table[iter->link].hash, &iter->hti);
 	rhashtable_walk_start(&iter->hti);
-- 
2.24.1