l2tp: constify net_device_ops structures

Check for net_device_ops structures that are only stored in the netdev_ops
field of a net_device structure.  This field is declared const, so
net_device_ops structures that have this property can be declared as const
also.

The semantic patch that makes this change is as follows:
(http://coccinelle.lip6.fr/)

// <smpl>
@r disable optional_qualifier@
identifier i;
position p;
@@
static struct net_device_ops i@p = { ... };

@ok@
identifier r.i;
struct net_device e;
position p;
@@
e.netdev_ops = &i@p;

@bad@
position p != {r.p,ok.p};
identifier r.i;
struct net_device_ops e;
@@
e@i@p

@depends on !bad disable optional_qualifier@
identifier r.i;
@@
static
+const
 struct net_device_ops i = { ... };
// </smpl>

The result of size on this file before the change is:
   text	      data     bss     dec         hex	  filename
   3401        931      44    4376        1118	net/l2tp/l2tp_eth.o

and after the change it is:
   text	     data        bss	    dec	    hex	filename
   3993       347         44       4384    1120	net/l2tp/l2tp_eth.o

Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/l2tp/l2tp_eth.c b/net/l2tp/l2tp_eth.c
index ef2cd30ca06e7d0a528f8f9c0b867ca059614105..965f7e344cef8961a85c4e2e6d36f7d1b043f3d7 100644 (file)
--- a/net/l2tp/l2tp_eth.c
+++ b/net/l2tp/l2tp_eth.c
@@ -121,7 +121,7 @@ static struct rtnl_link_stats64 *l2tp_eth_get_stats64(struct net_device *dev,
 }
 
 
-static struct net_device_ops l2tp_eth_netdev_ops = {
+static const struct net_device_ops l2tp_eth_netdev_ops = {
        .ndo_init               = l2tp_eth_dev_init,
        .ndo_uninit             = l2tp_eth_dev_uninit,
        .ndo_start_xmit         = l2tp_eth_dev_xmit,