hlist: drop the node parameter from iterators

I'm not sure why, but the hlist for each entry iterators were conceived

        list_for_each_entry(pos, head, member)

The hlist ones were greedy and wanted an extra parameter:

        hlist_for_each_entry(tpos, pos, head, member)

Why did they need an extra pos parameter? I'm not quite sure. Not only
they don't really need it, it also prevents the iterator from looking
exactly like the list iterator, which is unfortunate.

Besides the semantic patch, there was some manual work required:

 - Fix up the actual hlist iterators in linux/list.h
 - Fix up the declaration of other iterators based on the hlist ones.
 - A very small amount of places were using the 'node' parameter, this
 was modified to use 'obj->member' instead.
 - Coccinelle didn't handle the hlist_for_each_entry_safe iterator
 properly, so those had to be fixed up manually.

The semantic patch which is mostly the work of Peter Senna Tschudin is here:

@@
iterator name hlist_for_each_entry, hlist_for_each_entry_continue, hlist_for_each_entry_from, hlist_for_each_entry_rcu, hlist_for_each_entry_rcu_bh, hlist_for_each_entry_continue_rcu_bh, for_each_busy_worker, ax25_uid_for_each, ax25_for_each, inet_bind_bucket_for_each, sctp_for_each_hentry, sk_for_each, sk_for_each_rcu, sk_for_each_from, sk_for_each_safe, sk_for_each_bound, hlist_for_each_entry_safe, hlist_for_each_entry_continue_rcu, nr_neigh_for_each, nr_neigh_for_each_safe, nr_node_for_each, nr_node_for_each_safe, for_each_gfn_indirect_valid_sp, for_each_gfn_sp, for_each_host;

type T;
expression a,c,d,e;
identifier b;
statement S;
@@

-T b;
    <+... when != b
(
hlist_for_each_entry(a,
- b,
c, d) S
|
hlist_for_each_entry_continue(a,
- b,
c) S
|
hlist_for_each_entry_from(a,
- b,
c) S
|
hlist_for_each_entry_rcu(a,
- b,
c, d) S
|
hlist_for_each_entry_rcu_bh(a,
- b,
c, d) S
|
hlist_for_each_entry_continue_rcu_bh(a,
- b,
c) S
|
for_each_busy_worker(a, c,
- b,
d) S
|
ax25_uid_for_each(a,
- b,
c) S
|
ax25_for_each(a,
- b,
c) S
|
inet_bind_bucket_for_each(a,
- b,
c) S
|
sctp_for_each_hentry(a,
- b,
c) S
|
sk_for_each(a,
- b,
c) S
|
sk_for_each_rcu(a,
- b,
c) S
|
sk_for_each_from
-(a, b)
+(a)
S
+ sk_for_each_from(a) S
|
sk_for_each_safe(a,
- b,
c, d) S
|
sk_for_each_bound(a,
- b,
c) S
|
hlist_for_each_entry_safe(a,
- b,
c, d, e) S
|
hlist_for_each_entry_continue_rcu(a,
- b,
c) S
|
nr_neigh_for_each(a,
- b,
c) S
|
nr_neigh_for_each_safe(a,
- b,
c, d) S
|
nr_node_for_each(a,
- b,
c) S
|
nr_node_for_each_safe(a,
- b,
c, d) S
|
- for_each_gfn_sp(a, c, d, b) S
+ for_each_gfn_sp(a, c, d) S
|
- for_each_gfn_indirect_valid_sp(a, c, d, b) S
+ for_each_gfn_indirect_valid_sp(a, c, d) S
|
for_each_host(a,
- b,
c) S
|
for_each_host_safe(a,
- b,
c, d) S
|
for_each_mesh_entry(a,
- b,
c, d) S
)
    ...+>

[akpm@linux-foundation.org: drop bogus change from net/ipv4/raw.c]
[akpm@linux-foundation.org: drop bogus hunk from net/ipv6/raw.c]
[akpm@linux-foundation.org: checkpatch fixes]
[akpm@linux-foundation.org: fix warnings]
[akpm@linux-foudnation.org: redo intrusive kvm changes]
Tested-by: Peter Senna Tschudin <peter.senna@gmail.com>
Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
Cc: Wu Fengguang <fengguang.wu@intel.com>
Cc: Marcelo Tosatti <mtosatti@redhat.com>
Cc: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 7 insertions, 11 deletions

diff --git a/net/sched/sch_cbq.c b/net/sched/sch_cbq.c
index 0e19948470b8..13aa47aa2ffb 100644
--- a/net/sched/sch_cbq.c
+++ b/net/sched/sch_cbq.c
@@ -1041,14 +1041,13 @@ static void cbq_adjust_levels(struct cbq_class *this)
 static void cbq_normalize_quanta(struct cbq_sched_data *q, int prio)
 {
         struct cbq_class *cl;
-        struct hlist_node *n;
         unsigned int h;
 
         if (q->quanta[prio] == 0)
                 return;
 
         for (h = 0; h < q->clhash.hashsize; h++) {
-                hlist_for_each_entry(cl, n, &q->clhash.hash[h], common.hnode) {
+                hlist_for_each_entry(cl, &q->clhash.hash[h], common.hnode) {
                         /* BUGGGG... Beware! This expression suffer of
                          * arithmetic overflows!
                          */
@@ -1087,10 +1086,9 @@ static void cbq_sync_defmap(struct cbq_class *cl)
                         continue;
 
                 for (h = 0; h < q->clhash.hashsize; h++) {
-                        struct hlist_node *n;
                         struct cbq_class *c;
 
-                        hlist_for_each_entry(c, n, &q->clhash.hash[h],
+                        hlist_for_each_entry(c, &q->clhash.hash[h],
                                              common.hnode) {
                                 if (c->split == split && c->level < level &&
                                     c->defmap & (1<<i)) {
@@ -1210,7 +1208,6 @@ cbq_reset(struct Qdisc *sch)
 {
         struct cbq_sched_data *q = qdisc_priv(sch);
         struct cbq_class *cl;
-        struct hlist_node *n;
         int prio;
         unsigned int h;
 
@@ -1228,7 +1225,7 @@ cbq_reset(struct Qdisc *sch)
                 q->active[prio] = NULL;
 
         for (h = 0; h < q->clhash.hashsize; h++) {
-                hlist_for_each_entry(cl, n, &q->clhash.hash[h], common.hnode) {
+                hlist_for_each_entry(cl, &q->clhash.hash[h], common.hnode) {
                         qdisc_reset(cl->q);
 
                         cl->next_alive = NULL;
@@ -1697,7 +1694,7 @@ static void cbq_destroy_class(struct Qdisc *sch, struct cbq_class *cl)
 static void cbq_destroy(struct Qdisc *sch)
 {
         struct cbq_sched_data *q = qdisc_priv(sch);
-        struct hlist_node *n, *next;
+        struct hlist_node *next;
         struct cbq_class *cl;
         unsigned int h;
 
@@ -1710,11 +1707,11 @@ static void cbq_destroy(struct Qdisc *sch)
          * be bound to classes which have been destroyed already. --TGR '04
          */
         for (h = 0; h < q->clhash.hashsize; h++) {
-                hlist_for_each_entry(cl, n, &q->clhash.hash[h], common.hnode)
+                hlist_for_each_entry(cl, &q->clhash.hash[h], common.hnode)
                         tcf_destroy_chain(&cl->filter_list);
         }
         for (h = 0; h < q->clhash.hashsize; h++) {
-                hlist_for_each_entry_safe(cl, n, next, &q->clhash.hash[h],
+                hlist_for_each_entry_safe(cl, next, &q->clhash.hash[h],
                                           common.hnode)
                         cbq_destroy_class(sch, cl);
         }
@@ -2013,14 +2010,13 @@ static void cbq_walk(struct Qdisc *sch, struct qdisc_walker *arg)
 {
         struct cbq_sched_data *q = qdisc_priv(sch);
         struct cbq_class *cl;
-        struct hlist_node *n;
         unsigned int h;
 
         if (arg->stop)
                 return;
 
         for (h = 0; h < q->clhash.hashsize; h++) {
-                hlist_for_each_entry(cl, n, &q->clhash.hash[h], common.hnode) {
+                hlist_for_each_entry(cl, &q->clhash.hash[h], common.hnode) {
                         if (arg->count < arg->skip) {
                                 arg->count++;
                                 continue;