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>

4 files changed, 10 insertions, 17 deletions

diff --git a/net/sctp/endpointola.c b/net/sctp/endpointola.c
index 73aad3d16a45..2b3ef03c6098 100644
--- a/net/sctp/endpointola.c
+++ b/net/sctp/endpointola.c
@@ -332,7 +332,6 @@ static struct sctp_association *__sctp_endpoint_lookup_assoc(
         struct sctp_transport *t = NULL;
         struct sctp_hashbucket *head;
         struct sctp_ep_common *epb;
-        struct hlist_node *node;
         int hash;
         int rport;
 
@@ -350,7 +349,7 @@ static struct sctp_association *__sctp_endpoint_lookup_assoc(
                                  rport);
         head = &sctp_assoc_hashtable[hash];
         read_lock(&head->lock);
-        sctp_for_each_hentry(epb, node, &head->chain) {
+        sctp_for_each_hentry(epb, &head->chain) {
                 tmp = sctp_assoc(epb);
                 if (tmp->ep != ep || rport != tmp->peer.port)
                         continue;
diff --git a/net/sctp/input.c b/net/sctp/input.c
index 965bbbbe48d4..4b2c83146aa7 100644
--- a/net/sctp/input.c
+++ b/net/sctp/input.c
@@ -784,13 +784,12 @@ static struct sctp_endpoint *__sctp_rcv_lookup_endpoint(struct net *net,
         struct sctp_hashbucket *head;
         struct sctp_ep_common *epb;
         struct sctp_endpoint *ep;
-        struct hlist_node *node;
         int hash;
 
         hash = sctp_ep_hashfn(net, ntohs(laddr->v4.sin_port));
         head = &sctp_ep_hashtable[hash];
         read_lock(&head->lock);
-        sctp_for_each_hentry(epb, node, &head->chain) {
+        sctp_for_each_hentry(epb, &head->chain) {
                 ep = sctp_ep(epb);
                 if (sctp_endpoint_is_match(ep, net, laddr))
                         goto hit;
@@ -876,7 +875,6 @@ static struct sctp_association *__sctp_lookup_association(
         struct sctp_ep_common *epb;
         struct sctp_association *asoc;
         struct sctp_transport *transport;
-        struct hlist_node *node;
         int hash;
 
         /* Optimize here for direct hit, only listening connections can
@@ -886,7 +884,7 @@ static struct sctp_association *__sctp_lookup_association(
                                  ntohs(peer->v4.sin_port));
         head = &sctp_assoc_hashtable[hash];
         read_lock(&head->lock);
-        sctp_for_each_hentry(epb, node, &head->chain) {
+        sctp_for_each_hentry(epb, &head->chain) {
                 asoc = sctp_assoc(epb);
                 transport = sctp_assoc_is_match(asoc, net, local, peer);
                 if (transport)
diff --git a/net/sctp/proc.c b/net/sctp/proc.c
index 8c19e97262ca..ab3bba8cb0a8 100644
--- a/net/sctp/proc.c
+++ b/net/sctp/proc.c
@@ -213,7 +213,6 @@ static int sctp_eps_seq_show(struct seq_file *seq, void *v)
         struct sctp_ep_common *epb;
         struct sctp_endpoint *ep;
         struct sock *sk;
-        struct hlist_node *node;
         int    hash = *(loff_t *)v;
 
         if (hash >= sctp_ep_hashsize)
@@ -222,7 +221,7 @@ static int sctp_eps_seq_show(struct seq_file *seq, void *v)
         head = &sctp_ep_hashtable[hash];
         sctp_local_bh_disable();
         read_lock(&head->lock);
-        sctp_for_each_hentry(epb, node, &head->chain) {
+        sctp_for_each_hentry(epb, &head->chain) {
                 ep = sctp_ep(epb);
                 sk = epb->sk;
                 if (!net_eq(sock_net(sk), seq_file_net(seq)))
@@ -321,7 +320,6 @@ static int sctp_assocs_seq_show(struct seq_file *seq, void *v)
         struct sctp_ep_common *epb;
         struct sctp_association *assoc;
         struct sock *sk;
-        struct hlist_node *node;
         int    hash = *(loff_t *)v;
 
         if (hash >= sctp_assoc_hashsize)
@@ -330,7 +328,7 @@ static int sctp_assocs_seq_show(struct seq_file *seq, void *v)
         head = &sctp_assoc_hashtable[hash];
         sctp_local_bh_disable();
         read_lock(&head->lock);
-        sctp_for_each_hentry(epb, node, &head->chain) {
+        sctp_for_each_hentry(epb, &head->chain) {
                 assoc = sctp_assoc(epb);
                 sk = epb->sk;
                 if (!net_eq(sock_net(sk), seq_file_net(seq)))
@@ -436,7 +434,6 @@ static int sctp_remaddr_seq_show(struct seq_file *seq, void *v)
         struct sctp_hashbucket *head;
         struct sctp_ep_common *epb;
         struct sctp_association *assoc;
-        struct hlist_node *node;
         struct sctp_transport *tsp;
         int    hash = *(loff_t *)v;
 
@@ -447,7 +444,7 @@ static int sctp_remaddr_seq_show(struct seq_file *seq, void *v)
         sctp_local_bh_disable();
         read_lock(&head->lock);
         rcu_read_lock();
-        sctp_for_each_hentry(epb, node, &head->chain) {
+        sctp_for_each_hentry(epb, &head->chain) {
                 if (!net_eq(sock_net(epb->sk), seq_file_net(seq)))
                         continue;
                 assoc = sctp_assoc(epb);
diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index cedd9bf67b8c..c99458df3f3f 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -5882,8 +5882,7 @@ static struct sctp_bind_bucket *sctp_bucket_create(
 static long sctp_get_port_local(struct sock *sk, union sctp_addr *addr)
 {
         struct sctp_bind_hashbucket *head; /* hash list */
-        struct sctp_bind_bucket *pp; /* hash list port iterator */
-        struct hlist_node *node;
+        struct sctp_bind_bucket *pp;
         unsigned short snum;
         int ret;
 
@@ -5910,7 +5909,7 @@ static long sctp_get_port_local(struct sock *sk, union sctp_addr *addr)
                         index = sctp_phashfn(sock_net(sk), rover);
                         head = &sctp_port_hashtable[index];
                         sctp_spin_lock(&head->lock);
-                        sctp_for_each_hentry(pp, node, &head->chain)
+                        sctp_for_each_hentry(pp, &head->chain)
                                 if ((pp->port == rover) &&
                                     net_eq(sock_net(sk), pp->net))
                                         goto next;
@@ -5938,7 +5937,7 @@ static long sctp_get_port_local(struct sock *sk, union sctp_addr *addr)
                  */
                 head = &sctp_port_hashtable[sctp_phashfn(sock_net(sk), snum)];
                 sctp_spin_lock(&head->lock);
-                sctp_for_each_hentry(pp, node, &head->chain) {
+                sctp_for_each_hentry(pp, &head->chain) {
                         if ((pp->port == snum) && net_eq(pp->net, sock_net(sk)))
                                 goto pp_found;
                 }
@@ -5970,7 +5969,7 @@ pp_found:
                  * that this port/socket (sk) combination are already
                  * in an endpoint.
                  */
-                sk_for_each_bound(sk2, node, &pp->owner) {
+                sk_for_each_bound(sk2, &pp->owner) {
                         struct sctp_endpoint *ep2;
                         ep2 = sctp_sk(sk2)->ep;