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, 6 insertions, 9 deletions

diff --git a/net/batman-adv/distributed-arp-table.c b/net/batman-adv/distributed-arp-table.c
index 761a59002e34..d54188a112ea 100644
--- a/net/batman-adv/distributed-arp-table.c
+++ b/net/batman-adv/distributed-arp-table.c
@@ -83,7 +83,7 @@ static void __batadv_dat_purge(struct batadv_priv *bat_priv,
 {
 	spinlock_t *list_lock; /* protects write access to the hash lists */
 	struct batadv_dat_entry *dat_entry;
-	struct hlist_node *node, *node_tmp;
+	struct hlist_node *node_tmp;
 	struct hlist_head *head;
 	uint32_t i;
 
@@ -95,7 +95,7 @@ static void __batadv_dat_purge(struct batadv_priv *bat_priv,
 		list_lock = &bat_priv->dat.hash->list_locks[i];
 
 		spin_lock_bh(list_lock);
-		hlist_for_each_entry_safe(dat_entry, node, node_tmp, head,
+		hlist_for_each_entry_safe(dat_entry, node_tmp, head,
 					  hash_entry) {
 			/* if an helper function has been passed as parameter,
 			 * ask it if the entry has to be purged or not
@@ -103,7 +103,7 @@ static void __batadv_dat_purge(struct batadv_priv *bat_priv,
 			if (to_purge && !to_purge(dat_entry))
 				continue;
 
-			hlist_del_rcu(node);
+			hlist_del_rcu(&dat_entry->hash_entry);
 			batadv_dat_entry_free_ref(dat_entry);
 		}
 		spin_unlock_bh(list_lock);
@@ -235,7 +235,6 @@ static struct batadv_dat_entry *
 batadv_dat_entry_hash_find(struct batadv_priv *bat_priv, __be32 ip)
 {
 	struct hlist_head *head;
-	struct hlist_node *node;
 	struct batadv_dat_entry *dat_entry, *dat_entry_tmp = NULL;
 	struct batadv_hashtable *hash = bat_priv->dat.hash;
 	uint32_t index;
@@ -247,7 +246,7 @@ batadv_dat_entry_hash_find(struct batadv_priv *bat_priv, __be32 ip)
 	head = &hash->table[index];
 
 	rcu_read_lock();
-	hlist_for_each_entry_rcu(dat_entry, node, head, hash_entry) {
+	hlist_for_each_entry_rcu(dat_entry, head, hash_entry) {
 		if (dat_entry->ip != ip)
 			continue;
 
@@ -465,7 +464,6 @@ static void batadv_choose_next_candidate(struct batadv_priv *bat_priv,
 	batadv_dat_addr_t max = 0, tmp_max = 0;
 	struct batadv_orig_node *orig_node, *max_orig_node = NULL;
 	struct batadv_hashtable *hash = bat_priv->orig_hash;
-	struct hlist_node *node;
 	struct hlist_head *head;
 	int i;
 
@@ -481,7 +479,7 @@ static void batadv_choose_next_candidate(struct batadv_priv *bat_priv,
 		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) {
 			/* the dht space is a ring and addresses are unsigned */
 			tmp_max = BATADV_DAT_ADDR_MAX - orig_node->dat_addr +
 				  ip_key;
@@ -686,7 +684,6 @@ int batadv_dat_cache_seq_print_text(struct seq_file *seq, void *offset)
 	struct batadv_hashtable *hash = bat_priv->dat.hash;
 	struct batadv_dat_entry *dat_entry;
 	struct batadv_hard_iface *primary_if;
-	struct hlist_node *node;
 	struct hlist_head *head;
 	unsigned long last_seen_jiffies;
 	int last_seen_msecs, last_seen_secs, last_seen_mins;
@@ -704,7 +701,7 @@ int batadv_dat_cache_seq_print_text(struct seq_file *seq, void *offset)
 		head = &hash->table[i];
 
 		rcu_read_lock();
-		hlist_for_each_entry_rcu(dat_entry, node, head, hash_entry) {
+		hlist_for_each_entry_rcu(dat_entry, head, hash_entry) {
 			last_seen_jiffies = jiffies - dat_entry->last_update;
 			last_seen_msecs = jiffies_to_msecs(last_seen_jiffies);
 			last_seen_mins = last_seen_msecs / 60000;