Messages in this thread Patch in this message |  | | From | Julia Lawall <> | Subject | [PATCH] ipvlan: constify l3mdev_ops structure | Date | Sat, 15 Oct 2016 17:40:30 +0200 |
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This l3mdev_ops structure is only stored in the l3mdev_ops field of a net_device structure. This field is declared const, so the l3mdev_ops structure can be declared as const also. Additionally drop the __read_mostly annotation.
The semantic patch that adds const is as follows: (http://coccinelle.lip6.fr/)
// <smpl> @r disable optional_qualifier@ identifier i; position p; @@ static struct l3mdev_ops i@p = { ... };
@ok@ identifier r.i; struct net_device *e; position p; @@ e->l3mdev_ops = &i@p;
@bad@ position p != {r.p,ok.p}; identifier r.i; struct l3mdev_ops e; @@ e@i@p
@depends on !bad disable optional_qualifier@ identifier r.i; @@ static +const struct l3mdev_ops i = { ... }; // </smpl>
The effect on the layout of the .o file is shown by the following output of the size command, first before then after the transformation:
text data bss dec hex filename 7364 466 52 7882 1eca drivers/net/ipvlan/ipvlan_main.o 7412 434 52 7898 1eda drivers/net/ipvlan/ipvlan_main.o
Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>
--- drivers/net/ipvlan/ipvlan_main.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff -u -p a/drivers/net/ipvlan/ipvlan_main.c b/drivers/net/ipvlan/ipvlan_main.c --- a/drivers/net/ipvlan/ipvlan_main.c +++ b/drivers/net/ipvlan/ipvlan_main.c @@ -26,7 +26,7 @@ static struct nf_hook_ops ipvl_nfops[] _ }, }; -static struct l3mdev_ops ipvl_l3mdev_ops __read_mostly = { +static const struct l3mdev_ops ipvl_l3mdev_ops = { .l3mdev_l3_rcv = ipvlan_l3_rcv, };
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