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>

7 files changed, 31 insertions, 33 deletions

diff --git a/include/net/ax25.h b/include/net/ax25.h
index 53539acbd81a..89ed9ac5701f 100644
--- a/include/net/ax25.h
+++ b/include/net/ax25.h
@@ -161,8 +161,8 @@ typedef struct ax25_uid_assoc {
         ax25_address            call;
 } ax25_uid_assoc;
 
-#define ax25_uid_for_each(__ax25, node, list) \
-        hlist_for_each_entry(__ax25, node, list, uid_node)
+#define ax25_uid_for_each(__ax25, list) \
+        hlist_for_each_entry(__ax25, list, uid_node)
 
 #define ax25_uid_hold(ax25) \
         atomic_inc(&((ax25)->refcount))
@@ -247,8 +247,8 @@ typedef struct ax25_cb {
 
 #define ax25_sk(__sk) ((ax25_cb *)(__sk)->sk_protinfo)
 
-#define ax25_for_each(__ax25, node, list) \
-        hlist_for_each_entry(__ax25, node, list, ax25_node)
+#define ax25_for_each(__ax25, list) \
+        hlist_for_each_entry(__ax25, list, ax25_node)
 
 #define ax25_cb_hold(__ax25) \
         atomic_inc(&((__ax25)->refcount))
diff --git a/include/net/inet_hashtables.h b/include/net/inet_hashtables.h
index 7b2ae9d37076..ef83d9e844b5 100644
--- a/include/net/inet_hashtables.h
+++ b/include/net/inet_hashtables.h
@@ -94,8 +94,8 @@ static inline struct net *ib_net(struct inet_bind_bucket *ib)
         return read_pnet(&ib->ib_net);
 }
 
-#define inet_bind_bucket_for_each(tb, pos, head) \
-        hlist_for_each_entry(tb, pos, head, node)
+#define inet_bind_bucket_for_each(tb, head) \
+        hlist_for_each_entry(tb, head, node)
 
 struct inet_bind_hashbucket {
         spinlock_t              lock;
diff --git a/include/net/inet_timewait_sock.h b/include/net/inet_timewait_sock.h
index 7d658d577368..f908dfc06505 100644
--- a/include/net/inet_timewait_sock.h
+++ b/include/net/inet_timewait_sock.h
@@ -178,11 +178,11 @@ static inline int inet_twsk_del_dead_node(struct inet_timewait_sock *tw)
 #define inet_twsk_for_each(tw, node, head) \
         hlist_nulls_for_each_entry(tw, node, head, tw_node)
 
-#define inet_twsk_for_each_inmate(tw, node, jail) \
-        hlist_for_each_entry(tw, node, jail, tw_death_node)
+#define inet_twsk_for_each_inmate(tw, jail) \
+        hlist_for_each_entry(tw, jail, tw_death_node)
 
-#define inet_twsk_for_each_inmate_safe(tw, node, safe, jail) \
-        hlist_for_each_entry_safe(tw, node, safe, jail, tw_death_node)
+#define inet_twsk_for_each_inmate_safe(tw, safe, jail) \
+        hlist_for_each_entry_safe(tw, safe, jail, tw_death_node)
 
 static inline struct inet_timewait_sock *inet_twsk(const struct sock *sk)
 {
diff --git a/include/net/netrom.h b/include/net/netrom.h
index f0793c1cb5f8..121dcf854db5 100644
--- a/include/net/netrom.h
+++ b/include/net/netrom.h
@@ -154,17 +154,17 @@ static __inline__ void nr_node_unlock(struct nr_node *nr_node)
         nr_node_put(nr_node);
 }
 
-#define nr_neigh_for_each(__nr_neigh, node, list) \
-        hlist_for_each_entry(__nr_neigh, node, list, neigh_node)
+#define nr_neigh_for_each(__nr_neigh, list) \
+        hlist_for_each_entry(__nr_neigh, list, neigh_node)
 
-#define nr_neigh_for_each_safe(__nr_neigh, node, node2, list) \
-        hlist_for_each_entry_safe(__nr_neigh, node, node2, list, neigh_node)
+#define nr_neigh_for_each_safe(__nr_neigh, node2, list) \
+        hlist_for_each_entry_safe(__nr_neigh, node2, list, neigh_node)
 
-#define nr_node_for_each(__nr_node, node, list) \
-        hlist_for_each_entry(__nr_node, node, list, node_node)
+#define nr_node_for_each(__nr_node, list) \
+        hlist_for_each_entry(__nr_node, list, node_node)
 
-#define nr_node_for_each_safe(__nr_node, node, node2, list) \
-        hlist_for_each_entry_safe(__nr_node, node, node2, list, node_node)
+#define nr_node_for_each_safe(__nr_node, node2, list) \
+        hlist_for_each_entry_safe(__nr_node, node2, list, node_node)
 
 
 /*********************************************************************/
diff --git a/include/net/sch_generic.h b/include/net/sch_generic.h
index 2761c905504e..f10818fc8804 100644
--- a/include/net/sch_generic.h
+++ b/include/net/sch_generic.h
@@ -339,11 +339,10 @@ static inline struct Qdisc_class_common *
 qdisc_class_find(const struct Qdisc_class_hash *hash, u32 id)
 {
         struct Qdisc_class_common *cl;
-        struct hlist_node *n;
         unsigned int h;
 
         h = qdisc_class_hash(id, hash->hashmask);
-        hlist_for_each_entry(cl, n, &hash->hash[h], hnode) {
+        hlist_for_each_entry(cl, &hash->hash[h], hnode) {
                 if (cl->classid == id)
                         return cl;
         }
diff --git a/include/net/sctp/sctp.h b/include/net/sctp/sctp.h
index 7fdf298a47ef..df85a0c0f2d5 100644
--- a/include/net/sctp/sctp.h
+++ b/include/net/sctp/sctp.h
@@ -675,8 +675,8 @@ static inline int sctp_vtag_hashfn(__u16 lport, __u16 rport, __u32 vtag)
         return h & (sctp_assoc_hashsize - 1);
 }
 
-#define sctp_for_each_hentry(epb, node, head) \
-        hlist_for_each_entry(epb, node, head, node)
+#define sctp_for_each_hentry(epb, head) \
+        hlist_for_each_entry(epb, head, node)
 
 /* Is a socket of this style? */
 #define sctp_style(sk, style) __sctp_style((sk), (SCTP_SOCKET_##style))
diff --git a/include/net/sock.h b/include/net/sock.h
index a66caa223d18..14f6e9d19dc7 100644
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -606,24 +606,23 @@ static inline void sk_add_bind_node(struct sock *sk,
         hlist_add_head(&sk->sk_bind_node, list);
 }
 
-#define sk_for_each(__sk, node, list) \
-        hlist_for_each_entry(__sk, node, list, sk_node)
-#define sk_for_each_rcu(__sk, node, list) \
-        hlist_for_each_entry_rcu(__sk, node, list, sk_node)
+#define sk_for_each(__sk, list) \
+        hlist_for_each_entry(__sk, list, sk_node)
+#define sk_for_each_rcu(__sk, list) \
+        hlist_for_each_entry_rcu(__sk, list, sk_node)
 #define sk_nulls_for_each(__sk, node, list) \
         hlist_nulls_for_each_entry(__sk, node, list, sk_nulls_node)
 #define sk_nulls_for_each_rcu(__sk, node, list) \
         hlist_nulls_for_each_entry_rcu(__sk, node, list, sk_nulls_node)
-#define sk_for_each_from(__sk, node) \
-        if (__sk && ({ node = &(__sk)->sk_node; 1; })) \
-                hlist_for_each_entry_from(__sk, node, sk_node)
+#define sk_for_each_from(__sk) \
+        hlist_for_each_entry_from(__sk, sk_node)
 #define sk_nulls_for_each_from(__sk, node) \
         if (__sk && ({ node = &(__sk)->sk_nulls_node; 1; })) \
                 hlist_nulls_for_each_entry_from(__sk, node, sk_nulls_node)
-#define sk_for_each_safe(__sk, node, tmp, list) \
-        hlist_for_each_entry_safe(__sk, node, tmp, list, sk_node)
-#define sk_for_each_bound(__sk, node, list) \
-        hlist_for_each_entry(__sk, node, list, sk_bind_node)
+#define sk_for_each_safe(__sk, tmp, list) \
+        hlist_for_each_entry_safe(__sk, tmp, list, sk_node)
+#define sk_for_each_bound(__sk, list) \
+        hlist_for_each_entry(__sk, list, sk_bind_node)
 
 static inline struct user_namespace *sk_user_ns(struct sock *sk)
 {