When a nf_conntrack_l3/4proto parameter is not on the left hand side
of an assignment, its address is not taken, and it is not passed to a
function that may modify its fields, then it can be declared as const.
This change is useful from a documentation point of view, and can
possibly facilitate making some nf_conntrack_l4proto structures const
subsequently.
Done with the help of Coccinelle. The following semantic patch shows
the nf_conntrack_l4proto case.
// <smpl>
virtual update_results
virtual after_start
@initialize:ocaml@
@@
let unsafe = Hashtbl.create 101
let is_unsafe f = Hashtbl.mem unsafe f
let changed = ref false
(* The next three rules relate to the fact that we do not know the type of
void * variables. Fortunately this is only needed on the first iteration,
but it still means that the whole kernel will end up being considered. *)
@has depends on !after_start@
identifier f,l4proto;
position p;
@@
f(...,struct nf_conntrack_l4proto *l4proto,...) { ... }
@others depends on !after_start@
position p != has.p;
identifier f,x;
@@
f(...,void *x,...) { ... }
@script:ocaml@
f << others.f;
@@
changed := true;
Hashtbl.add unsafe f ()
@fpb depends on !update_results disable optional_qualifier exists@
identifier f : script:ocaml() { not(is_unsafe(f)) };
identifier l4proto,fld;
identifier bad : script:ocaml() { is_unsafe(bad) };
assignment operator aop;
expression e;
local idexpression fp;
@@
f(...,struct nf_conntrack_l4proto *l4proto,...)
{
<+...
(
(<+...l4proto...+>) aop e
|
&(<+...l4proto...+>)
|
bad(...,l4proto,...)
|
fp(...,l4proto,...)
|
(<+...e->fld...+>)(...,l4proto,...)
)
...+> }
@script:ocaml@
f << fpb.f;
@@
changed := true;
Hashtbl.add unsafe f ()
@finalize:ocaml depends on !update_results@
tbls << merge.unsafe;
c << merge.changed;
@@
List.iter
(fun t ->
Hashtbl.iter
(fun k v ->
if not (Hashtbl.mem unsafe k) then Hashtbl.add unsafe k ()) t)
tbls;
let changed = List.exists (fun x -> !x) c in
let it = new iteration() in
it#add_virtual_rule After_start;
(if not changed
then it#add_virtual_rule Update_results);
it#register()
@depends on update_results disable optional_qualifier@
identifier f : script:ocaml() { not(is_unsafe(f)) };
identifier l4proto;
@@
f(...,
+ const
struct nf_conntrack_l4proto *l4proto,...) { ... }
@depends on update_results disable optional_qualifier@
identifier f : script:ocaml() { not(is_unsafe(f)) };
identifier l4proto;
type T;
@@
T f(...,
+ const
struct nf_conntrack_l4proto *l4proto,...);
// </smpl>
---
include/net/netfilter/nf_conntrack_l3proto.h | 6 +++---
include/net/netfilter/nf_conntrack_l4proto.h | 8 ++++----
include/net/netfilter/nf_conntrack_timeout.h | 2 +-
net/netfilter/nf_conntrack_core.c | 8 ++++----
net/netfilter/nf_conntrack_netlink.c | 6 +++---
net/netfilter/nf_conntrack_proto.c | 20 ++++++++++----------
net/netfilter/nfnetlink_cttimeout.c | 2 +-
7 files changed, 26 insertions(+), 26 deletions(-)
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