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, 11 insertions, 21 deletions

diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index 4dc0d44a5d31..f2c7e615f902 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -1419,11 +1419,10 @@ int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
                   struct net_device *dev, int strict)
 {
         struct inet6_ifaddr *ifp;
-        struct hlist_node *node;
         unsigned int hash = inet6_addr_hash(addr);
 
         rcu_read_lock_bh();
-        hlist_for_each_entry_rcu(ifp, node, &inet6_addr_lst[hash], addr_lst) {
+        hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
                 if (!net_eq(dev_net(ifp->idev->dev), net))
                         continue;
                 if (ipv6_addr_equal(&ifp->addr, addr) &&
@@ -1445,9 +1444,8 @@ static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
 {
         unsigned int hash = inet6_addr_hash(addr);
         struct inet6_ifaddr *ifp;
-        struct hlist_node *node;
 
-        hlist_for_each_entry(ifp, node, &inet6_addr_lst[hash], addr_lst) {
+        hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
                 if (!net_eq(dev_net(ifp->idev->dev), net))
                         continue;
                 if (ipv6_addr_equal(&ifp->addr, addr)) {
@@ -1487,10 +1485,9 @@ struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *add
 {
         struct inet6_ifaddr *ifp, *result = NULL;
         unsigned int hash = inet6_addr_hash(addr);
-        struct hlist_node *node;
 
         rcu_read_lock_bh();
-        hlist_for_each_entry_rcu_bh(ifp, node, &inet6_addr_lst[hash], addr_lst) {
+        hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
                 if (!net_eq(dev_net(ifp->idev->dev), net))
                         continue;
                 if (ipv6_addr_equal(&ifp->addr, addr)) {
@@ -2907,11 +2904,10 @@ static int addrconf_ifdown(struct net_device *dev, int how)
         /* Step 2: clear hash table */
         for (i = 0; i < IN6_ADDR_HSIZE; i++) {
                 struct hlist_head *h = &inet6_addr_lst[i];
-                struct hlist_node *n;
 
                 spin_lock_bh(&addrconf_hash_lock);
         restart:
-                hlist_for_each_entry_rcu(ifa, n, h, addr_lst) {
+                hlist_for_each_entry_rcu(ifa, h, addr_lst) {
                         if (ifa->idev == idev) {
                                 hlist_del_init_rcu(&ifa->addr_lst);
                                 addrconf_del_timer(ifa);
@@ -3218,8 +3214,7 @@ static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
         }
 
         for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
-                struct hlist_node *n;
-                hlist_for_each_entry_rcu_bh(ifa, n, &inet6_addr_lst[state->bucket],
+                hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
                                          addr_lst) {
                         if (!net_eq(dev_net(ifa->idev->dev), net))
                                 continue;
@@ -3244,9 +3239,8 @@ static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
 {
         struct if6_iter_state *state = seq->private;
         struct net *net = seq_file_net(seq);
-        struct hlist_node *n = &ifa->addr_lst;
 
-        hlist_for_each_entry_continue_rcu_bh(ifa, n, addr_lst) {
+        hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
                 if (!net_eq(dev_net(ifa->idev->dev), net))
                         continue;
                 state->offset++;
@@ -3255,7 +3249,7 @@ static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
 
         while (++state->bucket < IN6_ADDR_HSIZE) {
                 state->offset = 0;
-                hlist_for_each_entry_rcu_bh(ifa, n,
+                hlist_for_each_entry_rcu_bh(ifa,
                                      &inet6_addr_lst[state->bucket], addr_lst) {
                         if (!net_eq(dev_net(ifa->idev->dev), net))
                                 continue;
@@ -3357,11 +3351,10 @@ int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
 {
         int ret = 0;
         struct inet6_ifaddr *ifp = NULL;
-        struct hlist_node *n;
         unsigned int hash = inet6_addr_hash(addr);
 
         rcu_read_lock_bh();
-        hlist_for_each_entry_rcu_bh(ifp, n, &inet6_addr_lst[hash], addr_lst) {
+        hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
                 if (!net_eq(dev_net(ifp->idev->dev), net))
                         continue;
                 if (ipv6_addr_equal(&ifp->addr, addr) &&
@@ -3383,7 +3376,6 @@ static void addrconf_verify(unsigned long foo)
 {
         unsigned long now, next, next_sec, next_sched;
         struct inet6_ifaddr *ifp;
-        struct hlist_node *node;
         int i;
 
         rcu_read_lock_bh();
@@ -3395,7 +3387,7 @@ static void addrconf_verify(unsigned long foo)
 
         for (i = 0; i < IN6_ADDR_HSIZE; i++) {
 restart:
-                hlist_for_each_entry_rcu_bh(ifp, node,
+                hlist_for_each_entry_rcu_bh(ifp,
                                          &inet6_addr_lst[i], addr_lst) {
                         unsigned long age;
 
@@ -3866,7 +3858,6 @@ static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
         struct net_device *dev;
         struct inet6_dev *idev;
         struct hlist_head *head;
-        struct hlist_node *node;
 
         s_h = cb->args[0];
         s_idx = idx = cb->args[1];
@@ -3876,7 +3867,7 @@ static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
                 idx = 0;
                 head = &net->dev_index_head[h];
-                hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
+                hlist_for_each_entry_rcu(dev, head, index_hlist) {
                         if (idx < s_idx)
                                 goto cont;
                         if (h > s_h || idx > s_idx)
@@ -4222,7 +4213,6 @@ static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
         struct net_device *dev;
         struct inet6_dev *idev;
         struct hlist_head *head;
-        struct hlist_node *node;
 
         s_h = cb->args[0];
         s_idx = cb->args[1];
@@ -4231,7 +4221,7 @@ static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
                 idx = 0;
                 head = &net->dev_index_head[h];
-                hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
+                hlist_for_each_entry_rcu(dev, head, index_hlist) {
                         if (idx < s_idx)
                                 goto cont;
                         idev = __in6_dev_get(dev);