linux-kernel - [PATCH 3.14 40/87] net: fix sparse warning in sk_dst

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Message-Id: <20140726190215.825454962@linuxfoundation.org>
Date:	Sat, 26 Jul 2014 12:02:14 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Eric Dumazet <edumazet@...gle.com>,
	kbuild test robot <fengguang.wu@...el.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: [PATCH 3.14 40/87] net: fix sparse warning in sk_dst_set()

3.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Eric Dumazet <edumazet@...gle.com>

[ Upstream commit 5925a0555bdaf0b396a84318cbc21ba085f6c0d3 ]

sk_dst_cache has __rcu annotation, so we need a cast to avoid
following sparse error :

include/net/sock.h:1774:19: warning: incorrect type in initializer (different address spaces)
include/net/sock.h:1774:19:    expected struct dst_entry [noderef] <asn:4>*__ret
include/net/sock.h:1774:19:    got struct dst_entry *dst

Signed-off-by: Eric Dumazet <edumazet@...gle.com>
Reported-by: kbuild test robot <fengguang.wu@...el.com>
Fixes: 7f502361531e ("ipv4: irq safe sk_dst_[re]set() and ipv4_sk_update_pmtu() fix")
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 include/net/sock.h |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -1796,7 +1796,7 @@ sk_dst_set(struct sock *sk, struct dst_e
 	struct dst_entry *old_dst;
 
 	sk_tx_queue_clear(sk);
-	old_dst = xchg(&sk->sk_dst_cache, dst);
+	old_dst = xchg((__force struct dst_entry **)&sk->sk_dst_cache, dst);
 	dst_release(old_dst);
 }
 


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