linux-kernel - [PATCH 3.12 082/123] af_unix: Convert the unix_sk macro to an inline function for type safety

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Message-Id: <458ae447867db59bffbadc5f9f0c50cb17515412.1446021555.git.jslaby@suse.cz>
Date:	Wed, 28 Oct 2015 14:53:13 +0100
From:	Jiri Slaby <jslaby@...e.cz>
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, Aaron Conole <aconole@...heb.org>,
	"David S . Miller" <davem@...emloft.net>,
	Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 082/123] af_unix: Convert the unix_sk macro to an inline function for type safety

From: Aaron Conole <aconole@...heb.org>

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

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

[ Upstream commit 4613012db1d911f80897f9446a49de817b2c4c47 ]

As suggested by Eric Dumazet this change replaces the
#define with a static inline function to enjoy
complaints by the compiler when misusing the API.

Signed-off-by: Aaron Conole <aconole@...heb.org>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 include/net/af_unix.h | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/include/net/af_unix.h b/include/net/af_unix.h
index a175ba4a7adb..dfe4ddfbb43c 100644
--- a/include/net/af_unix.h
+++ b/include/net/af_unix.h
@@ -64,7 +64,11 @@ struct unix_sock {
 #define UNIX_GC_MAYBE_CYCLE	1
 	struct socket_wq	peer_wq;
 };
-#define unix_sk(__sk) ((struct unix_sock *)__sk)
+
+static inline struct unix_sock *unix_sk(struct sock *sk)
+{
+	return (struct unix_sock *)sk;
+}
 
 #define peer_wait peer_wq.wait
 
-- 
2.6.2

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