linux-kernel - [PATCH 3.12 124/155] net: fix sparse warning in sk_dst

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Message-Id: <98ca8e76969cc73801dfdc638bd486d3c6d667ab.1428411004.git.jslaby@suse.cz>
Date:	Tue,  7 Apr 2015 14:51:33 +0200
From:	Jiri Slaby <jslaby@...e.cz>
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, Eric Dumazet <edumazet@...gle.com>,
	"David S. Miller" <davem@...emloft.net>,
	Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 124/155] net: fix sparse warning in sk_dst_set()

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

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

===============

commit 5925a0555bdaf0b396a84318cbc21ba085f6c0d3 upstream.

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: Jiri Slaby <jslaby@...e.cz>
---
 include/net/sock.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/net/sock.h b/include/net/sock.h
index 3899018a6b21..d157f4f56f01 100644
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -1791,7 +1791,7 @@ sk_dst_set(struct sock *sk, struct dst_entry *dst)
 	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);
 }
 
-- 
2.3.4

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