ipc: constify ipc_ops

There is no need to recreate the very same ipc_ops structure on every
kernel entry for msgget/semget/shmget.  Just declare it static and be
done with it.  While at it, constify it as we don't modify the structure
at runtime.

Found in the PaX patch, written by the PaX Team.

Signed-off-by: Mathias Krause <minipli@googlemail.com>
Cc: PaX Team <pageexec@freemail.hu>
Cc: Davidlohr Bueso <davidlohr@hp.com>
Cc: Manfred Spraul <manfred@colorfullife.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 4 insertions, 5 deletions

diff --git a/ipc/msg.c b/ipc/msg.c
index 649853105a5d..35e4018de53c 100644
--- a/ipc/msg.c
+++ b/ipc/msg.c
@@ -306,15 +306,14 @@ static inline int msg_security(struct kern_ipc_perm *ipcp, int msgflg)
 SYSCALL_DEFINE2(msgget, key_t, key, int, msgflg)
 {
         struct ipc_namespace *ns;
-        struct ipc_ops msg_ops;
+        static const struct ipc_ops msg_ops = {
+                .getnew = newque,
+                .associate = msg_security,
+        };
         struct ipc_params msg_params;
 
         ns = current->nsproxy->ipc_ns;
 
-        msg_ops.getnew = newque;
-        msg_ops.associate = msg_security;
-        msg_ops.more_checks = NULL;
-
         msg_params.key = key;
         msg_params.flg = msgflg;