linux-kernel - [PATCH net-next] cgroup: fix sock_cgroup_data initialization on earlier compilers

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Message-ID: <20151209173046.GO30240@mtj.duckdns.org>
Date:	Wed, 9 Dec 2015 12:30:46 -0500
From:	Tejun Heo <tj@...nel.org>
To:	"David S. Miller" <davem@...emloft.net>
Cc:	Alaa Hleihel <alaa@....mellanox.co.il>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH net-next] cgroup: fix sock_cgroup_data initialization on
 earlier compilers

sock_cgroup_data is a struct containing an anonymous union.
sock_cgroup_set_prioidx() and sock_cgroup_set_classid() were
initializing a field inside the anonymous union as follows.

 struct sock_ccgroup_data skcd_buf = { .val = VAL };

While this is fine on more recent compilers, gcc-4.4.7 triggers the
following errors.

 include/linux/cgroup-defs.h: In function ‘sock_cgroup_set_prioidx’:
 include/linux/cgroup-defs.h:619: error: unknown field ‘val’ specified in initializer
 include/linux/cgroup-defs.h:619: warning: missing braces around initializer
 include/linux/cgroup-defs.h:619: warning: (near initialization for ‘skcd_buf.<anonymous>’)

This is because .val belongs to the anonymous union nested inside the
struct but the initializer is missing the nesting.  Fix it by adding
an extra pair of braces.

Signed-off-by: Tejun Heo <tj@...nel.org>
Reported-by: Alaa Hleihel <alaa@....mellanox.co.il>
Fixes: bd1060a1d671 ("sock, cgroup: add sock->sk_cgroup")
---
 include/linux/cgroup-defs.h |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/include/linux/cgroup-defs.h
+++ b/include/linux/cgroup-defs.h
@@ -616,7 +616,7 @@ static inline u32 sock_cgroup_classid(st
 static inline void sock_cgroup_set_prioidx(struct sock_cgroup_data *skcd,
 					   u16 prioidx)
 {
-	struct sock_cgroup_data skcd_buf = { .val = READ_ONCE(skcd->val) };
+	struct sock_cgroup_data skcd_buf = {{ .val = READ_ONCE(skcd->val) }};
 
 	if (sock_cgroup_prioidx(&skcd_buf) == prioidx)
 		return;
@@ -633,7 +633,7 @@ static inline void sock_cgroup_set_prioi
 static inline void sock_cgroup_set_classid(struct sock_cgroup_data *skcd,
 					   u32 classid)
 {
-	struct sock_cgroup_data skcd_buf = { .val = READ_ONCE(skcd->val) };
+	struct sock_cgroup_data skcd_buf = {{ .val = READ_ONCE(skcd->val) }};
 
 	if (sock_cgroup_classid(&skcd_buf) == classid)
 		return;
--
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