linux-kernel - [PATCH] udp: Unbreak modules that rely on external __skb_recv

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Date:   Thu, 4 Oct 2018 13:37:32 +0200 (CEST)
From:   Jiri Kosina <jikos@...nel.org>
To:     "David S. Miller" <davem@...emloft.net>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Eric Dumazet <edumazet@...gle.com>
cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] udp: Unbreak modules that rely on external __skb_recv_udp()
 availability

From: Jiri Kosina <jkosina@...e.cz>

Commit 2276f58ac589 ("udp: use a separate rx queue for packet reception")
turned static inline __skb_recv_udp() from being a trivial helper around
__skb_recv_datagram() into a UDP specific implementaion, making it
EXPORT_SYMBOL_GPL() at the same time.

There are external modules that got broken by __skb_recv_udp() not being
visible to them. Let's unbreak them by making __skb_recv_udp EXPORT_SYMBOL().

Rationale (one of those) why this is actually "technically correct" thing 
to do: __skb_recv_udp() used to be an inline wrapper around 
__skb_recv_datagram(), which itself (still, and correctly so, I believe) 
is EXPORT_SYMBOL().

Cc: Paolo Abeni <pabeni@...hat.com>
Cc: Eric Dumazet <edumazet@...gle.com>
Fixes: 2276f58ac589 ("udp: use a separate rx queue for packet reception")
Signed-off-by: Jiri Kosina <jkosina@...e.cz>
---
 net/ipv4/udp.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index 7d69dd6fa7e8..c32a4c16b7ff 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -1627,7 +1627,7 @@ struct sk_buff *__skb_recv_udp(struct sock *sk, unsigned int flags,
 	*err = error;
 	return NULL;
 }
-EXPORT_SYMBOL_GPL(__skb_recv_udp);
+EXPORT_SYMBOL(__skb_recv_udp);

 /*
  * 	This should be easy, if there is something there we

-- 
Jiri Kosina
SUSE Labs