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, 14 insertions, 17 deletions

diff --git a/net/batman-adv/originator.c b/net/batman-adv/originator.c
index 457ea445217c..96fb80b724dc 100644
--- a/net/batman-adv/originator.c
+++ b/net/batman-adv/originator.c
@@ -118,7 +118,7 @@ out:
 
 static void batadv_orig_node_free_rcu(struct rcu_head *rcu)
 {
-        struct hlist_node *node, *node_tmp;
+        struct hlist_node *node_tmp;
         struct batadv_neigh_node *neigh_node, *tmp_neigh_node;
         struct batadv_orig_node *orig_node;
 
@@ -134,7 +134,7 @@ static void batadv_orig_node_free_rcu(struct rcu_head *rcu)
         }
 
         /* for all neighbors towards this originator ... */
-        hlist_for_each_entry_safe(neigh_node, node, node_tmp,
+        hlist_for_each_entry_safe(neigh_node, node_tmp,
                                   &orig_node->neigh_list, list) {
                 hlist_del_rcu(&neigh_node->list);
                 batadv_neigh_node_free_ref(neigh_node);
@@ -161,7 +161,7 @@ void batadv_orig_node_free_ref(struct batadv_orig_node *orig_node)
 void batadv_originator_free(struct batadv_priv *bat_priv)
 {
         struct batadv_hashtable *hash = bat_priv->orig_hash;
-        struct hlist_node *node, *node_tmp;
+        struct hlist_node *node_tmp;
         struct hlist_head *head;
         spinlock_t *list_lock; /* spinlock to protect write access */
         struct batadv_orig_node *orig_node;
@@ -179,9 +179,9 @@ void batadv_originator_free(struct batadv_priv *bat_priv)
                 list_lock = &hash->list_locks[i];
 
                 spin_lock_bh(list_lock);
-                hlist_for_each_entry_safe(orig_node, node, node_tmp,
+                hlist_for_each_entry_safe(orig_node, node_tmp,
                                           head, hash_entry) {
-                        hlist_del_rcu(node);
+                        hlist_del_rcu(&orig_node->hash_entry);
                         batadv_orig_node_free_ref(orig_node);
                 }
                 spin_unlock_bh(list_lock);
@@ -274,7 +274,7 @@ batadv_purge_orig_neighbors(struct batadv_priv *bat_priv,
                             struct batadv_orig_node *orig_node,
                             struct batadv_neigh_node **best_neigh_node)
 {
-        struct hlist_node *node, *node_tmp;
+        struct hlist_node *node_tmp;
         struct batadv_neigh_node *neigh_node;
         bool neigh_purged = false;
         unsigned long last_seen;
@@ -285,7 +285,7 @@ batadv_purge_orig_neighbors(struct batadv_priv *bat_priv,
         spin_lock_bh(&orig_node->neigh_list_lock);
 
         /* for all neighbors towards this originator ... */
-        hlist_for_each_entry_safe(neigh_node, node, node_tmp,
+        hlist_for_each_entry_safe(neigh_node, node_tmp,
                                   &orig_node->neigh_list, list) {
                 last_seen = neigh_node->last_seen;
                 if_incoming = neigh_node->if_incoming;
@@ -348,7 +348,7 @@ static bool batadv_purge_orig_node(struct batadv_priv *bat_priv,
 static void _batadv_purge_orig(struct batadv_priv *bat_priv)
 {
         struct batadv_hashtable *hash = bat_priv->orig_hash;
-        struct hlist_node *node, *node_tmp;
+        struct hlist_node *node_tmp;
         struct hlist_head *head;
         spinlock_t *list_lock; /* spinlock to protect write access */
         struct batadv_orig_node *orig_node;
@@ -363,13 +363,13 @@ static void _batadv_purge_orig(struct batadv_priv *bat_priv)
                 list_lock = &hash->list_locks[i];
 
                 spin_lock_bh(list_lock);
-                hlist_for_each_entry_safe(orig_node, node, node_tmp,
+                hlist_for_each_entry_safe(orig_node, node_tmp,
                                           head, hash_entry) {
                         if (batadv_purge_orig_node(bat_priv, orig_node)) {
                                 if (orig_node->gw_flags)
                                         batadv_gw_node_delete(bat_priv,
                                                               orig_node);
-                                hlist_del_rcu(node);
+                                hlist_del_rcu(&orig_node->hash_entry);
                                 batadv_orig_node_free_ref(orig_node);
                                 continue;
                         }
@@ -408,7 +408,6 @@ int batadv_orig_seq_print_text(struct seq_file *seq, void *offset)
         struct net_device *net_dev = (struct net_device *)seq->private;
         struct batadv_priv *bat_priv = netdev_priv(net_dev);
         struct batadv_hashtable *hash = bat_priv->orig_hash;
-        struct hlist_node *node, *node_tmp;
         struct hlist_head *head;
         struct batadv_hard_iface *primary_if;
         struct batadv_orig_node *orig_node;
@@ -434,7 +433,7 @@ int batadv_orig_seq_print_text(struct seq_file *seq, void *offset)
                 head = &hash->table[i];
 
                 rcu_read_lock();
-                hlist_for_each_entry_rcu(orig_node, node, head, hash_entry) {
+                hlist_for_each_entry_rcu(orig_node, head, hash_entry) {
                         neigh_node = batadv_orig_node_get_router(orig_node);
                         if (!neigh_node)
                                 continue;
@@ -453,7 +452,7 @@ int batadv_orig_seq_print_text(struct seq_file *seq, void *offset)
                                    neigh_node->addr,
                                    neigh_node->if_incoming->net_dev->name);
 
-                        hlist_for_each_entry_rcu(neigh_node_tmp, node_tmp,
+                        hlist_for_each_entry_rcu(neigh_node_tmp,
                                                  &orig_node->neigh_list, list) {
                                 seq_printf(seq, " %pM (%3i)",
                                            neigh_node_tmp->addr,
@@ -511,7 +510,6 @@ int batadv_orig_hash_add_if(struct batadv_hard_iface *hard_iface,
 {
         struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
         struct batadv_hashtable *hash = bat_priv->orig_hash;
-        struct hlist_node *node;
         struct hlist_head *head;
         struct batadv_orig_node *orig_node;
         uint32_t i;
@@ -524,7 +522,7 @@ int batadv_orig_hash_add_if(struct batadv_hard_iface *hard_iface,
                 head = &hash->table[i];
 
                 rcu_read_lock();
-                hlist_for_each_entry_rcu(orig_node, node, head, hash_entry) {
+                hlist_for_each_entry_rcu(orig_node, head, hash_entry) {
                         spin_lock_bh(&orig_node->ogm_cnt_lock);
                         ret = batadv_orig_node_add_if(orig_node, max_if_num);
                         spin_unlock_bh(&orig_node->ogm_cnt_lock);
@@ -595,7 +593,6 @@ int batadv_orig_hash_del_if(struct batadv_hard_iface *hard_iface,
 {
         struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
         struct batadv_hashtable *hash = bat_priv->orig_hash;
-        struct hlist_node *node;
         struct hlist_head *head;
         struct batadv_hard_iface *hard_iface_tmp;
         struct batadv_orig_node *orig_node;
@@ -609,7 +606,7 @@ int batadv_orig_hash_del_if(struct batadv_hard_iface *hard_iface,
                 head = &hash->table[i];
 
                 rcu_read_lock();
-                hlist_for_each_entry_rcu(orig_node, node, head, hash_entry) {
+                hlist_for_each_entry_rcu(orig_node, head, hash_entry) {
                         spin_lock_bh(&orig_node->ogm_cnt_lock);
                         ret = batadv_orig_node_del_if(orig_node, max_if_num,
                                                       hard_iface->if_num);