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>

6 files changed, 30 insertions, 45 deletions

diff --git a/net/sched/sch_api.c b/net/sched/sch_api.c
index a181b484812a..c297e2a8e2a1 100644
--- a/net/sched/sch_api.c
+++ b/net/sched/sch_api.c
@@ -545,7 +545,7 @@ static void qdisc_class_hash_free(struct hlist_head *h, unsigned int n)
 void qdisc_class_hash_grow(struct Qdisc *sch, struct Qdisc_class_hash *clhash)
 {
         struct Qdisc_class_common *cl;
-        struct hlist_node *n, *next;
+        struct hlist_node *next;
         struct hlist_head *nhash, *ohash;
         unsigned int nsize, nmask, osize;
         unsigned int i, h;
@@ -564,7 +564,7 @@ void qdisc_class_hash_grow(struct Qdisc *sch, struct Qdisc_class_hash *clhash)
 
         sch_tree_lock(sch);
         for (i = 0; i < osize; i++) {
-                hlist_for_each_entry_safe(cl, n, next, &ohash[i], hnode) {
+                hlist_for_each_entry_safe(cl, next, &ohash[i], hnode) {
                         h = qdisc_class_hash(cl->classid, nmask);
                         hlist_add_head(&cl->hnode, &nhash[h]);
                 }
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;
diff --git a/net/sched/sch_drr.c b/net/sched/sch_drr.c
index 71e50c80315f..759b308d1a8d 100644
--- a/net/sched/sch_drr.c
+++ b/net/sched/sch_drr.c
@@ -293,14 +293,13 @@ static void drr_walk(struct Qdisc *sch, struct qdisc_walker *arg)
 {
         struct drr_sched *q = qdisc_priv(sch);
         struct drr_class *cl;
-        struct hlist_node *n;
         unsigned int i;
 
         if (arg->stop)
                 return;
 
         for (i = 0; i < q->clhash.hashsize; i++) {
-                hlist_for_each_entry(cl, n, &q->clhash.hash[i], common.hnode) {
+                hlist_for_each_entry(cl, &q->clhash.hash[i], common.hnode) {
                         if (arg->count < arg->skip) {
                                 arg->count++;
                                 continue;
@@ -451,11 +450,10 @@ static void drr_reset_qdisc(struct Qdisc *sch)
 {
         struct drr_sched *q = qdisc_priv(sch);
         struct drr_class *cl;
-        struct hlist_node *n;
         unsigned int i;
 
         for (i = 0; i < q->clhash.hashsize; i++) {
-                hlist_for_each_entry(cl, n, &q->clhash.hash[i], common.hnode) {
+                hlist_for_each_entry(cl, &q->clhash.hash[i], common.hnode) {
                         if (cl->qdisc->q.qlen)
                                 list_del(&cl->alist);
                         qdisc_reset(cl->qdisc);
@@ -468,13 +466,13 @@ static void drr_destroy_qdisc(struct Qdisc *sch)
 {
         struct drr_sched *q = qdisc_priv(sch);
         struct drr_class *cl;
-        struct hlist_node *n, *next;
+        struct hlist_node *next;
         unsigned int i;
 
         tcf_destroy_chain(&q->filter_list);
 
         for (i = 0; i < q->clhash.hashsize; i++) {
-                hlist_for_each_entry_safe(cl, n, next, &q->clhash.hash[i],
+                hlist_for_each_entry_safe(cl, next, &q->clhash.hash[i],
                                           common.hnode)
                         drr_destroy_class(sch, cl);
         }
diff --git a/net/sched/sch_hfsc.c b/net/sched/sch_hfsc.c
index 6c2ec4510540..9facea03faeb 100644
--- a/net/sched/sch_hfsc.c
+++ b/net/sched/sch_hfsc.c
@@ -1389,7 +1389,6 @@ static void
 hfsc_walk(struct Qdisc *sch, struct qdisc_walker *arg)
 {
         struct hfsc_sched *q = qdisc_priv(sch);
-        struct hlist_node *n;
         struct hfsc_class *cl;
         unsigned int i;
 
@@ -1397,7 +1396,7 @@ hfsc_walk(struct Qdisc *sch, struct qdisc_walker *arg)
                 return;
 
         for (i = 0; i < q->clhash.hashsize; i++) {
-                hlist_for_each_entry(cl, n, &q->clhash.hash[i],
+                hlist_for_each_entry(cl, &q->clhash.hash[i],
                                      cl_common.hnode) {
                         if (arg->count < arg->skip) {
                                 arg->count++;
@@ -1523,11 +1522,10 @@ hfsc_reset_qdisc(struct Qdisc *sch)
 {
         struct hfsc_sched *q = qdisc_priv(sch);
         struct hfsc_class *cl;
-        struct hlist_node *n;
         unsigned int i;
 
         for (i = 0; i < q->clhash.hashsize; i++) {
-                hlist_for_each_entry(cl, n, &q->clhash.hash[i], cl_common.hnode)
+                hlist_for_each_entry(cl, &q->clhash.hash[i], cl_common.hnode)
                         hfsc_reset_class(cl);
         }
         q->eligible = RB_ROOT;
@@ -1540,16 +1538,16 @@ static void
 hfsc_destroy_qdisc(struct Qdisc *sch)
 {
         struct hfsc_sched *q = qdisc_priv(sch);
-        struct hlist_node *n, *next;
+        struct hlist_node *next;
         struct hfsc_class *cl;
         unsigned int i;
 
         for (i = 0; i < q->clhash.hashsize; i++) {
-                hlist_for_each_entry(cl, n, &q->clhash.hash[i], cl_common.hnode)
+                hlist_for_each_entry(cl, &q->clhash.hash[i], cl_common.hnode)
                         tcf_destroy_chain(&cl->filter_list);
         }
         for (i = 0; i < q->clhash.hashsize; i++) {
-                hlist_for_each_entry_safe(cl, n, next, &q->clhash.hash[i],
+                hlist_for_each_entry_safe(cl, next, &q->clhash.hash[i],
                                           cl_common.hnode)
                         hfsc_destroy_class(sch, cl);
         }
@@ -1564,12 +1562,11 @@ hfsc_dump_qdisc(struct Qdisc *sch, struct sk_buff *skb)
         unsigned char *b = skb_tail_pointer(skb);
         struct tc_hfsc_qopt qopt;
         struct hfsc_class *cl;
-        struct hlist_node *n;
         unsigned int i;
 
         sch->qstats.backlog = 0;
         for (i = 0; i < q->clhash.hashsize; i++) {
-                hlist_for_each_entry(cl, n, &q->clhash.hash[i], cl_common.hnode)
+                hlist_for_each_entry(cl, &q->clhash.hash[i], cl_common.hnode)
                         sch->qstats.backlog += cl->qdisc->qstats.backlog;
         }
 
diff --git a/net/sched/sch_htb.c b/net/sched/sch_htb.c
index 03c2692ca01e..571f1d211f4d 100644
--- a/net/sched/sch_htb.c
+++ b/net/sched/sch_htb.c
@@ -949,11 +949,10 @@ static void htb_reset(struct Qdisc *sch)
 {
         struct htb_sched *q = qdisc_priv(sch);
         struct htb_class *cl;
-        struct hlist_node *n;
         unsigned int i;
 
         for (i = 0; i < q->clhash.hashsize; i++) {
-                hlist_for_each_entry(cl, n, &q->clhash.hash[i], common.hnode) {
+                hlist_for_each_entry(cl, &q->clhash.hash[i], common.hnode) {
                         if (cl->level)
                                 memset(&cl->un.inner, 0, sizeof(cl->un.inner));
                         else {
@@ -1218,7 +1217,7 @@ static void htb_destroy_class(struct Qdisc *sch, struct htb_class *cl)
 static void htb_destroy(struct Qdisc *sch)
 {
         struct htb_sched *q = qdisc_priv(sch);
-        struct hlist_node *n, *next;
+        struct hlist_node *next;
         struct htb_class *cl;
         unsigned int i;
 
@@ -1232,11 +1231,11 @@ static void htb_destroy(struct Qdisc *sch)
         tcf_destroy_chain(&q->filter_list);
 
         for (i = 0; i < q->clhash.hashsize; i++) {
-                hlist_for_each_entry(cl, n, &q->clhash.hash[i], common.hnode)
+                hlist_for_each_entry(cl, &q->clhash.hash[i], common.hnode)
                         tcf_destroy_chain(&cl->filter_list);
         }
         for (i = 0; i < q->clhash.hashsize; i++) {
-                hlist_for_each_entry_safe(cl, n, next, &q->clhash.hash[i],
+                hlist_for_each_entry_safe(cl, next, &q->clhash.hash[i],
                                           common.hnode)
                         htb_destroy_class(sch, cl);
         }
@@ -1516,14 +1515,13 @@ static void htb_walk(struct Qdisc *sch, struct qdisc_walker *arg)
 {
         struct htb_sched *q = qdisc_priv(sch);
         struct htb_class *cl;
-        struct hlist_node *n;
         unsigned int i;
 
         if (arg->stop)
                 return;
 
         for (i = 0; i < q->clhash.hashsize; i++) {
-                hlist_for_each_entry(cl, n, &q->clhash.hash[i], common.hnode) {
+                hlist_for_each_entry(cl, &q->clhash.hash[i], common.hnode) {
                         if (arg->count < arg->skip) {
                                 arg->count++;
                                 continue;
diff --git a/net/sched/sch_qfq.c b/net/sched/sch_qfq.c
index 6ed37652a4c3..e9a77f621c3d 100644
--- a/net/sched/sch_qfq.c
+++ b/net/sched/sch_qfq.c
@@ -276,9 +276,8 @@ static struct qfq_aggregate *qfq_find_agg(struct qfq_sched *q,
                                           u32 lmax, u32 weight)
 {
         struct qfq_aggregate *agg;
-        struct hlist_node *n;
 
-        hlist_for_each_entry(agg, n, &q->nonfull_aggs, nonfull_next)
+        hlist_for_each_entry(agg, &q->nonfull_aggs, nonfull_next)
                 if (agg->lmax == lmax && agg->class_weight == weight)
                         return agg;
 
@@ -670,14 +669,13 @@ static void qfq_walk(struct Qdisc *sch, struct qdisc_walker *arg)
 {
         struct qfq_sched *q = qdisc_priv(sch);
         struct qfq_class *cl;
-        struct hlist_node *n;
         unsigned int i;
 
         if (arg->stop)
                 return;
 
         for (i = 0; i < q->clhash.hashsize; i++) {
-                hlist_for_each_entry(cl, n, &q->clhash.hash[i], common.hnode) {
+                hlist_for_each_entry(cl, &q->clhash.hash[i], common.hnode) {
                         if (arg->count < arg->skip) {
                                 arg->count++;
                                 continue;
@@ -1376,11 +1374,10 @@ static unsigned int qfq_drop_from_slot(struct qfq_sched *q,
                                        struct hlist_head *slot)
 {
         struct qfq_aggregate *agg;
-        struct hlist_node *n;
         struct qfq_class *cl;
         unsigned int len;
 
-        hlist_for_each_entry(agg, n, slot, next) {
+        hlist_for_each_entry(agg, slot, next) {
                 list_for_each_entry(cl, &agg->active, alist) {
 
                         if (!cl->qdisc->ops->drop)
@@ -1459,11 +1456,10 @@ static void qfq_reset_qdisc(struct Qdisc *sch)
 {
         struct qfq_sched *q = qdisc_priv(sch);
         struct qfq_class *cl;
-        struct hlist_node *n;
         unsigned int i;
 
         for (i = 0; i < q->clhash.hashsize; i++) {
-                hlist_for_each_entry(cl, n, &q->clhash.hash[i], common.hnode) {
+                hlist_for_each_entry(cl, &q->clhash.hash[i], common.hnode) {
                         if (cl->qdisc->q.qlen > 0)
                                 qfq_deactivate_class(q, cl);
 
@@ -1477,13 +1473,13 @@ static void qfq_destroy_qdisc(struct Qdisc *sch)
 {
         struct qfq_sched *q = qdisc_priv(sch);
         struct qfq_class *cl;
-        struct hlist_node *n, *next;
+        struct hlist_node *next;
         unsigned int i;
 
         tcf_destroy_chain(&q->filter_list);
 
         for (i = 0; i < q->clhash.hashsize; i++) {
-                hlist_for_each_entry_safe(cl, n, next, &q->clhash.hash[i],
+                hlist_for_each_entry_safe(cl, next, &q->clhash.hash[i],
                                           common.hnode) {
                         qfq_destroy_class(sch, cl);
                 }