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, 9 insertions, 14 deletions

diff --git a/net/bridge/br_fdb.c b/net/bridge/br_fdb.c
index 8117900af4de..b0812c91c0f0 100644
--- a/net/bridge/br_fdb.c
+++ b/net/bridge/br_fdb.c
@@ -181,9 +181,9 @@ void br_fdb_cleanup(unsigned long _data)
         spin_lock(&br->hash_lock);
         for (i = 0; i < BR_HASH_SIZE; i++) {
                 struct net_bridge_fdb_entry *f;
-                struct hlist_node *h, *n;
+                struct hlist_node *n;
 
-                hlist_for_each_entry_safe(f, h, n, &br->hash[i], hlist) {
+                hlist_for_each_entry_safe(f, n, &br->hash[i], hlist) {
                         unsigned long this_timer;
                         if (f->is_static)
                                 continue;
@@ -207,8 +207,8 @@ void br_fdb_flush(struct net_bridge *br)
         spin_lock_bh(&br->hash_lock);
         for (i = 0; i < BR_HASH_SIZE; i++) {
                 struct net_bridge_fdb_entry *f;
-                struct hlist_node *h, *n;
-                hlist_for_each_entry_safe(f, h, n, &br->hash[i], hlist) {
+                struct hlist_node *n;
+                hlist_for_each_entry_safe(f, n, &br->hash[i], hlist) {
                         if (!f->is_static)
                                 fdb_delete(br, f);
                 }
@@ -266,10 +266,9 @@ struct net_bridge_fdb_entry *__br_fdb_get(struct net_bridge *br,
                                           const unsigned char *addr,
                                           __u16 vid)
 {
-        struct hlist_node *h;
         struct net_bridge_fdb_entry *fdb;
 
-        hlist_for_each_entry_rcu(fdb, h,
+        hlist_for_each_entry_rcu(fdb,
                                 &br->hash[br_mac_hash(addr, vid)], hlist) {
                 if (ether_addr_equal(fdb->addr.addr, addr) &&
                     fdb->vlan_id == vid) {
@@ -315,14 +314,13 @@ int br_fdb_fillbuf(struct net_bridge *br, void *buf,
 {
         struct __fdb_entry *fe = buf;
         int i, num = 0;
-        struct hlist_node *h;
         struct net_bridge_fdb_entry *f;
 
         memset(buf, 0, maxnum*sizeof(struct __fdb_entry));
 
         rcu_read_lock();
         for (i = 0; i < BR_HASH_SIZE; i++) {
-                hlist_for_each_entry_rcu(f, h, &br->hash[i], hlist) {
+                hlist_for_each_entry_rcu(f, &br->hash[i], hlist) {
                         if (num >= maxnum)
                                 goto out;
 
@@ -363,10 +361,9 @@ static struct net_bridge_fdb_entry *fdb_find(struct hlist_head *head,
                                              const unsigned char *addr,
                                              __u16 vid)
 {
-        struct hlist_node *h;
         struct net_bridge_fdb_entry *fdb;
 
-        hlist_for_each_entry(fdb, h, head, hlist) {
+        hlist_for_each_entry(fdb, head, hlist) {
                 if (ether_addr_equal(fdb->addr.addr, addr) &&
                     fdb->vlan_id == vid)
                         return fdb;
@@ -378,10 +375,9 @@ static struct net_bridge_fdb_entry *fdb_find_rcu(struct hlist_head *head,
                                                  const unsigned char *addr,
                                                  __u16 vid)
 {
-        struct hlist_node *h;
         struct net_bridge_fdb_entry *fdb;
 
-        hlist_for_each_entry_rcu(fdb, h, head, hlist) {
+        hlist_for_each_entry_rcu(fdb, head, hlist) {
                 if (ether_addr_equal(fdb->addr.addr, addr) &&
                     fdb->vlan_id == vid)
                         return fdb;
@@ -593,10 +589,9 @@ int br_fdb_dump(struct sk_buff *skb,
                 goto out;
 
         for (i = 0; i < BR_HASH_SIZE; i++) {
-                struct hlist_node *h;
                 struct net_bridge_fdb_entry *f;
 
-                hlist_for_each_entry_rcu(f, h, &br->hash[i], hlist) {
+                hlist_for_each_entry_rcu(f, &br->hash[i], hlist) {
                         if (idx < cb->args[0])
                                 goto skip;