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>

23 files changed, 69 insertions, 115 deletions

diff --git a/fs/affs/amigaffs.c b/fs/affs/amigaffs.c
index eb82ee53ee0b..d9a43674cb94 100644
--- a/fs/affs/amigaffs.c
+++ b/fs/affs/amigaffs.c
@@ -125,9 +125,8 @@ static void
 affs_fix_dcache(struct inode *inode, u32 entry_ino)
 {
         struct dentry *dentry;
-        struct hlist_node *p;
         spin_lock(&inode->i_lock);
-        hlist_for_each_entry(dentry, p, &inode->i_dentry, d_alias) {
+        hlist_for_each_entry(dentry, &inode->i_dentry, d_alias) {
                 if (entry_ino == (u32)(long)dentry->d_fsdata) {
                         dentry->d_fsdata = (void *)inode->i_ino;
                         break;
diff --git a/fs/aio.c b/fs/aio.c
index 064bfbe37566..3f941f2a3059 100644
--- a/fs/aio.c
+++ b/fs/aio.c
@@ -591,11 +591,10 @@ static struct kioctx *lookup_ioctx(unsigned long ctx_id)
 {
         struct mm_struct *mm = current->mm;
         struct kioctx *ctx, *ret = NULL;
-        struct hlist_node *n;
 
         rcu_read_lock();
 
-        hlist_for_each_entry_rcu(ctx, n, &mm->ioctx_list, list) {
+        hlist_for_each_entry_rcu(ctx, &mm->ioctx_list, list) {
                 /*
                  * RCU protects us against accessing freed memory but
                  * we have to be careful not to get a reference when the
diff --git a/fs/cifs/inode.c b/fs/cifs/inode.c
index d2a833999bcc..83f2606c76d0 100644
--- a/fs/cifs/inode.c
+++ b/fs/cifs/inode.c
@@ -816,10 +816,9 @@ static bool
 inode_has_hashed_dentries(struct inode *inode)
 {
         struct dentry *dentry;
-        struct hlist_node *p;
 
         spin_lock(&inode->i_lock);
-        hlist_for_each_entry(dentry, p, &inode->i_dentry, d_alias) {
+        hlist_for_each_entry(dentry, &inode->i_dentry, d_alias) {
                 if (!d_unhashed(dentry) || IS_ROOT(dentry)) {
                         spin_unlock(&inode->i_lock);
                         return true;
diff --git a/fs/dcache.c b/fs/dcache.c
index 68220dd0c135..fbfae008ba44 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -675,11 +675,10 @@ EXPORT_SYMBOL(dget_parent);
 static struct dentry *__d_find_alias(struct inode *inode, int want_discon)
 {
         struct dentry *alias, *discon_alias;
-        struct hlist_node *p;
 
 again:
         discon_alias = NULL;
-        hlist_for_each_entry(alias, p, &inode->i_dentry, d_alias) {
+        hlist_for_each_entry(alias, &inode->i_dentry, d_alias) {
                 spin_lock(&alias->d_lock);
                 if (S_ISDIR(inode->i_mode) || !d_unhashed(alias)) {
                         if (IS_ROOT(alias) &&
@@ -730,10 +729,9 @@ EXPORT_SYMBOL(d_find_alias);
 void d_prune_aliases(struct inode *inode)
 {
         struct dentry *dentry;
-        struct hlist_node *p;
 restart:
         spin_lock(&inode->i_lock);
-        hlist_for_each_entry(dentry, p, &inode->i_dentry, d_alias) {
+        hlist_for_each_entry(dentry, &inode->i_dentry, d_alias) {
                 spin_lock(&dentry->d_lock);
                 if (!dentry->d_count) {
                         __dget_dlock(dentry);
@@ -1443,14 +1441,13 @@ static struct dentry *__d_instantiate_unique(struct dentry *entry,
         int len = entry->d_name.len;
         const char *name = entry->d_name.name;
         unsigned int hash = entry->d_name.hash;
-        struct hlist_node *p;
 
         if (!inode) {
                 __d_instantiate(entry, NULL);
                 return NULL;
         }
 
-        hlist_for_each_entry(alias, p, &inode->i_dentry, d_alias) {
+        hlist_for_each_entry(alias, &inode->i_dentry, d_alias) {
                 /*
                  * Don't need alias->d_lock here, because aliases with
                  * d_parent == entry->d_parent are not subject to name or
diff --git a/fs/dlm/lowcomms.c b/fs/dlm/lowcomms.c
index dd87a31bcc21..4f5ad246582f 100644
--- a/fs/dlm/lowcomms.c
+++ b/fs/dlm/lowcomms.c
@@ -177,12 +177,11 @@ static inline int nodeid_hash(int nodeid)
 static struct connection *__find_con(int nodeid)
 {
         int r;
-        struct hlist_node *h;
         struct connection *con;
 
         r = nodeid_hash(nodeid);
 
-        hlist_for_each_entry(con, h, &connection_hash[r], list) {
+        hlist_for_each_entry(con, &connection_hash[r], list) {
                 if (con->nodeid == nodeid)
                         return con;
         }
@@ -232,13 +231,12 @@ static struct connection *__nodeid2con(int nodeid, gfp_t alloc)
 static void foreach_conn(void (*conn_func)(struct connection *c))
 {
         int i;
-        struct hlist_node *h, *n;
+        struct hlist_node *n;
         struct connection *con;
 
         for (i = 0; i < CONN_HASH_SIZE; i++) {
-                hlist_for_each_entry_safe(con, h, n, &connection_hash[i], list){
+                hlist_for_each_entry_safe(con, n, &connection_hash[i], list)
                         conn_func(con);
-                }
         }
 }
 
@@ -257,13 +255,12 @@ static struct connection *nodeid2con(int nodeid, gfp_t allocation)
 static struct connection *assoc2con(int assoc_id)
 {
         int i;
-        struct hlist_node *h;
         struct connection *con;
 
         mutex_lock(&connections_lock);
 
         for (i = 0 ; i < CONN_HASH_SIZE; i++) {
-                hlist_for_each_entry(con, h, &connection_hash[i], list) {
+                hlist_for_each_entry(con, &connection_hash[i], list) {
                         if (con->sctp_assoc == assoc_id) {
                                 mutex_unlock(&connections_lock);
                                 return con;
diff --git a/fs/ecryptfs/messaging.c b/fs/ecryptfs/messaging.c
index 5fa2471796c2..8d7a577ae497 100644
--- a/fs/ecryptfs/messaging.c
+++ b/fs/ecryptfs/messaging.c
@@ -115,10 +115,9 @@ void ecryptfs_msg_ctx_alloc_to_free(struct ecryptfs_msg_ctx *msg_ctx)
  */
 int ecryptfs_find_daemon_by_euid(struct ecryptfs_daemon **daemon)
 {
-        struct hlist_node *elem;
         int rc;
 
-        hlist_for_each_entry(*daemon, elem,
+        hlist_for_each_entry(*daemon,
                             &ecryptfs_daemon_hash[ecryptfs_current_euid_hash()],
                             euid_chain) {
                 if (uid_eq((*daemon)->file->f_cred->euid, current_euid())) {
@@ -445,7 +444,6 @@ void ecryptfs_release_messaging(void)
                 mutex_unlock(&ecryptfs_msg_ctx_lists_mux);
         }
         if (ecryptfs_daemon_hash) {
-                struct hlist_node *elem;
                 struct ecryptfs_daemon *daemon;
                 int i;
 
@@ -453,7 +451,7 @@ void ecryptfs_release_messaging(void)
                 for (i = 0; i < (1 << ecryptfs_hash_bits); i++) {
                         int rc;
 
-                        hlist_for_each_entry(daemon, elem,
+                        hlist_for_each_entry(daemon,
                                              &ecryptfs_daemon_hash[i],
                                              euid_chain) {
                                 rc = ecryptfs_exorcise_daemon(daemon);
diff --git a/fs/exportfs/expfs.c b/fs/exportfs/expfs.c
index 5df4bb4aab14..262fc9940982 100644
--- a/fs/exportfs/expfs.c
+++ b/fs/exportfs/expfs.c
@@ -44,14 +44,13 @@ find_acceptable_alias(struct dentry *result,
 {
         struct dentry *dentry, *toput = NULL;
         struct inode *inode;
-        struct hlist_node *p;
 
         if (acceptable(context, result))
                 return result;
 
         inode = result->d_inode;
         spin_lock(&inode->i_lock);
-        hlist_for_each_entry(dentry, p, &inode->i_dentry, d_alias) {
+        hlist_for_each_entry(dentry, &inode->i_dentry, d_alias) {
                 dget(dentry);
                 spin_unlock(&inode->i_lock);
                 if (toput)
diff --git a/fs/fat/inode.c b/fs/fat/inode.c
index 780e20806346..acf6e479b443 100644
--- a/fs/fat/inode.c
+++ b/fs/fat/inode.c
@@ -341,12 +341,11 @@ struct inode *fat_iget(struct super_block *sb, loff_t i_pos)
 {
         struct msdos_sb_info *sbi = MSDOS_SB(sb);
         struct hlist_head *head = sbi->inode_hashtable + fat_hash(i_pos);
-        struct hlist_node *_p;
         struct msdos_inode_info *i;
         struct inode *inode = NULL;
 
         spin_lock(&sbi->inode_hash_lock);
-        hlist_for_each_entry(i, _p, head, i_fat_hash) {
+        hlist_for_each_entry(i, head, i_fat_hash) {
                 BUG_ON(i->vfs_inode.i_sb != sb);
                 if (i->i_pos != i_pos)
                         continue;
diff --git a/fs/fat/nfs.c b/fs/fat/nfs.c
index ef4b5faba87b..499c10438ca2 100644
--- a/fs/fat/nfs.c
+++ b/fs/fat/nfs.c
@@ -21,13 +21,12 @@ static struct inode *fat_dget(struct super_block *sb, int i_logstart)
 {
         struct msdos_sb_info *sbi = MSDOS_SB(sb);
         struct hlist_head *head;
-        struct hlist_node *_p;
         struct msdos_inode_info *i;
         struct inode *inode = NULL;
 
         head = sbi->dir_hashtable + fat_dir_hash(i_logstart);
         spin_lock(&sbi->dir_hash_lock);
-        hlist_for_each_entry(i, _p, head, i_dir_hash) {
+        hlist_for_each_entry(i, head, i_dir_hash) {
                 BUG_ON(i->vfs_inode.i_sb != sb);
                 if (i->i_logstart != i_logstart)
                         continue;
diff --git a/fs/fscache/cookie.c b/fs/fscache/cookie.c
index 8dcb114758e3..e2cba1f60c21 100644
--- a/fs/fscache/cookie.c
+++ b/fs/fscache/cookie.c
@@ -237,13 +237,12 @@ static int fscache_alloc_object(struct fscache_cache *cache,
                                 struct fscache_cookie *cookie)
 {
         struct fscache_object *object;
-        struct hlist_node *_n;
         int ret;
 
         _enter("%p,%p{%s}", cache, cookie, cookie->def->name);
 
         spin_lock(&cookie->lock);
-        hlist_for_each_entry(object, _n, &cookie->backing_objects,
+        hlist_for_each_entry(object, &cookie->backing_objects,
                              cookie_link) {
                 if (object->cache == cache)
                         goto object_already_extant;
@@ -311,7 +310,6 @@ static int fscache_attach_object(struct fscache_cookie *cookie,
 {
         struct fscache_object *p;
         struct fscache_cache *cache = object->cache;
-        struct hlist_node *_n;
         int ret;
 
         _enter("{%s},{OBJ%x}", cookie->def->name, object->debug_id);
@@ -321,7 +319,7 @@ static int fscache_attach_object(struct fscache_cookie *cookie,
         /* there may be multiple initial creations of this object, but we only
          * want one */
         ret = -EEXIST;
-        hlist_for_each_entry(p, _n, &cookie->backing_objects, cookie_link) {
+        hlist_for_each_entry(p, &cookie->backing_objects, cookie_link) {
                 if (p->cache == object->cache) {
                         if (p->state >= FSCACHE_OBJECT_DYING)
                                 ret = -ENOBUFS;
@@ -331,7 +329,7 @@ static int fscache_attach_object(struct fscache_cookie *cookie,
 
         /* pin the parent object */
         spin_lock_nested(&cookie->parent->lock, 1);
-        hlist_for_each_entry(p, _n, &cookie->parent->backing_objects,
+        hlist_for_each_entry(p, &cookie->parent->backing_objects,
                              cookie_link) {
                 if (p->cache == object->cache) {
                         if (p->state >= FSCACHE_OBJECT_DYING) {
@@ -435,7 +433,6 @@ EXPORT_SYMBOL(__fscache_wait_on_invalidate);
 void __fscache_update_cookie(struct fscache_cookie *cookie)
 {
         struct fscache_object *object;
-        struct hlist_node *_p;
 
         fscache_stat(&fscache_n_updates);
 
@@ -452,7 +449,7 @@ void __fscache_update_cookie(struct fscache_cookie *cookie)
         spin_lock(&cookie->lock);
 
         /* update the index entry on disk in each cache backing this cookie */
-        hlist_for_each_entry(object, _p,
+        hlist_for_each_entry(object,
                              &cookie->backing_objects, cookie_link) {
                 fscache_raise_event(object, FSCACHE_OBJECT_EV_UPDATE);
         }
diff --git a/fs/inode.c b/fs/inode.c
index 67880e604399..f5f7c06c36fb 100644
--- a/fs/inode.c
+++ b/fs/inode.c
@@ -798,11 +798,10 @@ static struct inode *find_inode(struct super_block *sb,
                                 int (*test)(struct inode *, void *),
                                 void *data)
 {
-        struct hlist_node *node;
         struct inode *inode = NULL;
 
 repeat:
-        hlist_for_each_entry(inode, node, head, i_hash) {
+        hlist_for_each_entry(inode, head, i_hash) {
                 spin_lock(&inode->i_lock);
                 if (inode->i_sb != sb) {
                         spin_unlock(&inode->i_lock);
@@ -830,11 +829,10 @@ repeat:
 static struct inode *find_inode_fast(struct super_block *sb,
                                 struct hlist_head *head, unsigned long ino)
 {
-        struct hlist_node *node;
         struct inode *inode = NULL;
 
 repeat:
-        hlist_for_each_entry(inode, node, head, i_hash) {
+        hlist_for_each_entry(inode, head, i_hash) {
                 spin_lock(&inode->i_lock);
                 if (inode->i_ino != ino) {
                         spin_unlock(&inode->i_lock);
@@ -1132,11 +1130,10 @@ EXPORT_SYMBOL(iget_locked);
 static int test_inode_iunique(struct super_block *sb, unsigned long ino)
 {
         struct hlist_head *b = inode_hashtable + hash(sb, ino);
-        struct hlist_node *node;
         struct inode *inode;
 
         spin_lock(&inode_hash_lock);
-        hlist_for_each_entry(inode, node, b, i_hash) {
+        hlist_for_each_entry(inode, b, i_hash) {
                 if (inode->i_ino == ino && inode->i_sb == sb) {
                         spin_unlock(&inode_hash_lock);
                         return 0;
@@ -1291,10 +1288,9 @@ int insert_inode_locked(struct inode *inode)
         struct hlist_head *head = inode_hashtable + hash(sb, ino);
 
         while (1) {
-                struct hlist_node *node;
                 struct inode *old = NULL;
                 spin_lock(&inode_hash_lock);
-                hlist_for_each_entry(old, node, head, i_hash) {
+                hlist_for_each_entry(old, head, i_hash) {
                         if (old->i_ino != ino)
                                 continue;
                         if (old->i_sb != sb)
@@ -1306,7 +1302,7 @@ int insert_inode_locked(struct inode *inode)
                         }
                         break;
                 }
-                if (likely(!node)) {
+                if (likely(!old)) {
                         spin_lock(&inode->i_lock);
                         inode->i_state |= I_NEW;
                         hlist_add_head(&inode->i_hash, head);
@@ -1334,11 +1330,10 @@ int insert_inode_locked4(struct inode *inode, unsigned long hashval,
         struct hlist_head *head = inode_hashtable + hash(sb, hashval);
 
         while (1) {
-                struct hlist_node *node;
                 struct inode *old = NULL;
 
                 spin_lock(&inode_hash_lock);
-                hlist_for_each_entry(old, node, head, i_hash) {
+                hlist_for_each_entry(old, head, i_hash) {
                         if (old->i_sb != sb)
                                 continue;
                         if (!test(old, data))
@@ -1350,7 +1345,7 @@ int insert_inode_locked4(struct inode *inode, unsigned long hashval,
                         }
                         break;
                 }
-                if (likely(!node)) {
+                if (likely(!old)) {
                         spin_lock(&inode->i_lock);
                         inode->i_state |= I_NEW;
                         hlist_add_head(&inode->i_hash, head);
diff --git a/fs/lockd/host.c b/fs/lockd/host.c
index 0e17090c310f..abdd75d44dd4 100644
--- a/fs/lockd/host.c
+++ b/fs/lockd/host.c
@@ -32,15 +32,15 @@
 static struct hlist_head        nlm_server_hosts[NLM_HOST_NRHASH];
 static struct hlist_head        nlm_client_hosts[NLM_HOST_NRHASH];
 
-#define for_each_host(host, pos, chain, table) \
+#define for_each_host(host, chain, table) \
         for ((chain) = (table); \
              (chain) < (table) + NLM_HOST_NRHASH; ++(chain)) \
-                hlist_for_each_entry((host), (pos), (chain), h_hash)
+                hlist_for_each_entry((host), (chain), h_hash)
 
-#define for_each_host_safe(host, pos, next, chain, table) \
+#define for_each_host_safe(host, next, chain, table) \
         for ((chain) = (table); \
              (chain) < (table) + NLM_HOST_NRHASH; ++(chain)) \
-                hlist_for_each_entry_safe((host), (pos), (next), \
+                hlist_for_each_entry_safe((host), (next), \
                                                 (chain), h_hash)
 
 static unsigned long            nrhosts;
@@ -225,7 +225,6 @@ struct nlm_host *nlmclnt_lookup_host(const struct sockaddr *sap,
                 .net            = net,
         };
         struct hlist_head *chain;
-        struct hlist_node *pos;
         struct nlm_host *host;
         struct nsm_handle *nsm = NULL;
         struct lockd_net *ln = net_generic(net, lockd_net_id);
@@ -237,7 +236,7 @@ struct nlm_host *nlmclnt_lookup_host(const struct sockaddr *sap,
         mutex_lock(&nlm_host_mutex);
 
         chain = &nlm_client_hosts[nlm_hash_address(sap)];
-        hlist_for_each_entry(host, pos, chain, h_hash) {
+        hlist_for_each_entry(host, chain, h_hash) {
                 if (host->net != net)
                         continue;
                 if (!rpc_cmp_addr(nlm_addr(host), sap))
@@ -322,7 +321,6 @@ struct nlm_host *nlmsvc_lookup_host(const struct svc_rqst *rqstp,
                                     const size_t hostname_len)
 {
         struct hlist_head *chain;
-        struct hlist_node *pos;
         struct nlm_host *host = NULL;
         struct nsm_handle *nsm = NULL;
         struct sockaddr *src_sap = svc_daddr(rqstp);
@@ -350,7 +348,7 @@ struct nlm_host *nlmsvc_lookup_host(const struct svc_rqst *rqstp,
                 nlm_gc_hosts(net);
 
         chain = &nlm_server_hosts[nlm_hash_address(ni.sap)];
-        hlist_for_each_entry(host, pos, chain, h_hash) {
+        hlist_for_each_entry(host, chain, h_hash) {
                 if (host->net != net)
                         continue;
                 if (!rpc_cmp_addr(nlm_addr(host), ni.sap))
@@ -515,10 +513,9 @@ static struct nlm_host *next_host_state(struct hlist_head *cache,
 {
         struct nlm_host *host;
         struct hlist_head *chain;
-        struct hlist_node *pos;
 
         mutex_lock(&nlm_host_mutex);
-        for_each_host(host, pos, chain, cache) {
+        for_each_host(host, chain, cache) {
                 if (host->h_nsmhandle == nsm
                     && host->h_nsmstate != info->state) {
                         host->h_nsmstate = info->state;
@@ -570,7 +567,6 @@ void nlm_host_rebooted(const struct nlm_reboot *info)
 static void nlm_complain_hosts(struct net *net)
 {
         struct hlist_head *chain;
-        struct hlist_node *pos;
         struct nlm_host *host;
 
         if (net) {
@@ -587,7 +583,7 @@ static void nlm_complain_hosts(struct net *net)
                 dprintk("lockd: %lu hosts left:\n", nrhosts);
         }
 
-        for_each_host(host, pos, chain, nlm_server_hosts) {
+        for_each_host(host, chain, nlm_server_hosts) {
                 if (net && host->net != net)
                         continue;
                 dprintk("       %s (cnt %d use %d exp %ld net %p)\n",
@@ -600,14 +596,13 @@ void
 nlm_shutdown_hosts_net(struct net *net)
 {
         struct hlist_head *chain;
-        struct hlist_node *pos;
         struct nlm_host *host;
 
         mutex_lock(&nlm_host_mutex);
 
         /* First, make all hosts eligible for gc */
         dprintk("lockd: nuking all hosts in net %p...\n", net);
-        for_each_host(host, pos, chain, nlm_server_hosts) {
+        for_each_host(host, chain, nlm_server_hosts) {
                 if (net && host->net != net)
                         continue;
                 host->h_expires = jiffies - 1;
@@ -644,11 +639,11 @@ static void
 nlm_gc_hosts(struct net *net)
 {
         struct hlist_head *chain;
-        struct hlist_node *pos, *next;
+        struct hlist_node *next;
         struct nlm_host *host;
 
         dprintk("lockd: host garbage collection for net %p\n", net);
-        for_each_host(host, pos, chain, nlm_server_hosts) {
+        for_each_host(host, chain, nlm_server_hosts) {
                 if (net && host->net != net)
                         continue;
                 host->h_inuse = 0;
@@ -657,7 +652,7 @@ nlm_gc_hosts(struct net *net)
         /* Mark all hosts that hold locks, blocks or shares */
         nlmsvc_mark_resources(net);
 
-        for_each_host_safe(host, pos, next, chain, nlm_server_hosts) {
+        for_each_host_safe(host, next, chain, nlm_server_hosts) {
                 if (net && host->net != net)
                         continue;
                 if (atomic_read(&host->h_count) || host->h_inuse
diff --git a/fs/lockd/svcsubs.c b/fs/lockd/svcsubs.c
index b3a24b07d981..d17bb62b06d6 100644
--- a/fs/lockd/svcsubs.c
+++ b/fs/lockd/svcsubs.c
@@ -84,7 +84,6 @@ __be32
 nlm_lookup_file(struct svc_rqst *rqstp, struct nlm_file **result,
                                         struct nfs_fh *f)
 {
-        struct hlist_node *pos;
         struct nlm_file *file;
         unsigned int    hash;
         __be32          nfserr;
@@ -96,7 +95,7 @@ nlm_lookup_file(struct svc_rqst *rqstp, struct nlm_file **result,
         /* Lock file table */
         mutex_lock(&nlm_file_mutex);
 
-        hlist_for_each_entry(file, pos, &nlm_files[hash], f_list)
+        hlist_for_each_entry(file, &nlm_files[hash], f_list)
                 if (!nfs_compare_fh(&file->f_handle, f))
                         goto found;
 
@@ -248,13 +247,13 @@ static int
 nlm_traverse_files(void *data, nlm_host_match_fn_t match,
                 int (*is_failover_file)(void *data, struct nlm_file *file))
 {
-        struct hlist_node *pos, *next;
+        struct hlist_node *next;
         struct nlm_file *file;
         int i, ret = 0;
 
         mutex_lock(&nlm_file_mutex);
         for (i = 0; i < FILE_NRHASH; i++) {
-                hlist_for_each_entry_safe(file, pos, next, &nlm_files[i], f_list) {
+                hlist_for_each_entry_safe(file, next, &nlm_files[i], f_list) {
                         if (is_failover_file && !is_failover_file(data, file))
                                 continue;
                         file->f_count++;
diff --git a/fs/nfs/pnfs_dev.c b/fs/nfs/pnfs_dev.c
index d35b62e83ea6..6da209bd9408 100644
--- a/fs/nfs/pnfs_dev.c
+++ b/fs/nfs/pnfs_dev.c
@@ -77,9 +77,8 @@ _lookup_deviceid(const struct pnfs_layoutdriver_type *ld,
                  long hash)
 {
         struct nfs4_deviceid_node *d;
-        struct hlist_node *n;
 
-        hlist_for_each_entry_rcu(d, n, &nfs4_deviceid_cache[hash], node)
+        hlist_for_each_entry_rcu(d, &nfs4_deviceid_cache[hash], node)
                 if (d->ld == ld && d->nfs_client == clp &&
                     !memcmp(&d->deviceid, id, sizeof(*id))) {
                         if (atomic_read(&d->ref))
@@ -248,12 +247,11 @@ static void
 _deviceid_purge_client(const struct nfs_client *clp, long hash)
 {
         struct nfs4_deviceid_node *d;
-        struct hlist_node *n;
         HLIST_HEAD(tmp);
 
         spin_lock(&nfs4_deviceid_lock);
         rcu_read_lock();
-        hlist_for_each_entry_rcu(d, n, &nfs4_deviceid_cache[hash], node)
+        hlist_for_each_entry_rcu(d, &nfs4_deviceid_cache[hash], node)
                 if (d->nfs_client == clp && atomic_read(&d->ref)) {
                         hlist_del_init_rcu(&d->node);
                         hlist_add_head(&d->tmpnode, &tmp);
@@ -291,12 +289,11 @@ void
 nfs4_deviceid_mark_client_invalid(struct nfs_client *clp)
 {
         struct nfs4_deviceid_node *d;
-        struct hlist_node *n;
         int i;
 
         rcu_read_lock();
         for (i = 0; i < NFS4_DEVICE_ID_HASH_SIZE; i ++){
-                hlist_for_each_entry_rcu(d, n, &nfs4_deviceid_cache[i], node)
+                hlist_for_each_entry_rcu(d, &nfs4_deviceid_cache[i], node)
                         if (d->nfs_client == clp)
                                 set_bit(NFS_DEVICEID_INVALID, &d->flags);
         }
diff --git a/fs/nfsd/nfscache.c b/fs/nfsd/nfscache.c
index 2cbac34a55da..da3dbd0f8979 100644
--- a/fs/nfsd/nfscache.c
+++ b/fs/nfsd/nfscache.c
@@ -120,7 +120,6 @@ hash_refile(struct svc_cacherep *rp)
 int
 nfsd_cache_lookup(struct svc_rqst *rqstp)
 {
-        struct hlist_node       *hn;
         struct hlist_head       *rh;
         struct svc_cacherep     *rp;
         __be32                  xid = rqstp->rq_xid;
@@ -141,7 +140,7 @@ nfsd_cache_lookup(struct svc_rqst *rqstp)
         rtn = RC_DOIT;
 
         rh = &cache_hash[request_hash(xid)];
-        hlist_for_each_entry(rp, hn, rh, c_hash) {
+        hlist_for_each_entry(rp, rh, c_hash) {
                 if (rp->c_state != RC_UNUSED &&
                     xid == rp->c_xid && proc == rp->c_proc &&
                     proto == rp->c_prot && vers == rp->c_vers &&
diff --git a/fs/notify/fsnotify.c b/fs/notify/fsnotify.c
index 6baadb5a8430..4bb21d67d9b1 100644
--- a/fs/notify/fsnotify.c
+++ b/fs/notify/fsnotify.c
@@ -52,7 +52,6 @@ void __fsnotify_vfsmount_delete(struct vfsmount *mnt)
 void __fsnotify_update_child_dentry_flags(struct inode *inode)
 {
         struct dentry *alias;
-        struct hlist_node *p;
         int watched;
 
         if (!S_ISDIR(inode->i_mode))
@@ -64,7 +63,7 @@ void __fsnotify_update_child_dentry_flags(struct inode *inode)
         spin_lock(&inode->i_lock);
         /* run all of the dentries associated with this inode.  Since this is a
          * directory, there damn well better only be one item on this list */
-        hlist_for_each_entry(alias, p, &inode->i_dentry, d_alias) {
+        hlist_for_each_entry(alias, &inode->i_dentry, d_alias) {
                 struct dentry *child;
 
                 /* run all of the children of the original inode and fix their
diff --git a/fs/notify/inode_mark.c b/fs/notify/inode_mark.c
index f31e90fc050d..74825be65b7b 100644
--- a/fs/notify/inode_mark.c
+++ b/fs/notify/inode_mark.c
@@ -36,12 +36,11 @@
 static void fsnotify_recalc_inode_mask_locked(struct inode *inode)
 {
         struct fsnotify_mark *mark;
-        struct hlist_node *pos;
         __u32 new_mask = 0;
 
         assert_spin_locked(&inode->i_lock);
 
-        hlist_for_each_entry(mark, pos, &inode->i_fsnotify_marks, i.i_list)
+        hlist_for_each_entry(mark, &inode->i_fsnotify_marks, i.i_list)
                 new_mask |= mark->mask;
         inode->i_fsnotify_mask = new_mask;
 }
@@ -87,11 +86,11 @@ void fsnotify_destroy_inode_mark(struct fsnotify_mark *mark)
 void fsnotify_clear_marks_by_inode(struct inode *inode)
 {
         struct fsnotify_mark *mark, *lmark;
-        struct hlist_node *pos, *n;
+        struct hlist_node *n;
         LIST_HEAD(free_list);
 
         spin_lock(&inode->i_lock);
-        hlist_for_each_entry_safe(mark, pos, n, &inode->i_fsnotify_marks, i.i_list) {
+        hlist_for_each_entry_safe(mark, n, &inode->i_fsnotify_marks, i.i_list) {
                 list_add(&mark->i.free_i_list, &free_list);
                 hlist_del_init_rcu(&mark->i.i_list);
                 fsnotify_get_mark(mark);
@@ -129,11 +128,10 @@ static struct fsnotify_mark *fsnotify_find_inode_mark_locked(
                 struct inode *inode)
 {
         struct fsnotify_mark *mark;
-        struct hlist_node *pos;
 
         assert_spin_locked(&inode->i_lock);
 
-        hlist_for_each_entry(mark, pos, &inode->i_fsnotify_marks, i.i_list) {
+        hlist_for_each_entry(mark, &inode->i_fsnotify_marks, i.i_list) {
                 if (mark->group == group) {
                         fsnotify_get_mark(mark);
                         return mark;
@@ -194,8 +192,7 @@ int fsnotify_add_inode_mark(struct fsnotify_mark *mark,
                             struct fsnotify_group *group, struct inode *inode,
                             int allow_dups)
 {
-        struct fsnotify_mark *lmark;
-        struct hlist_node *node, *last = NULL;
+        struct fsnotify_mark *lmark, *last = NULL;
         int ret = 0;
 
         mark->flags |= FSNOTIFY_MARK_FLAG_INODE;
@@ -214,8 +211,8 @@ int fsnotify_add_inode_mark(struct fsnotify_mark *mark,
         }
 
         /* should mark be in the middle of the current list? */
-        hlist_for_each_entry(lmark, node, &inode->i_fsnotify_marks, i.i_list) {
-                last = node;
+        hlist_for_each_entry(lmark, &inode->i_fsnotify_marks, i.i_list) {
+                last = lmark;
 
                 if ((lmark->group == group) && !allow_dups) {
                         ret = -EEXIST;
@@ -235,7 +232,7 @@ int fsnotify_add_inode_mark(struct fsnotify_mark *mark,
 
         BUG_ON(last == NULL);
         /* mark should be the last entry.  last is the current last entry */
-        hlist_add_after_rcu(last, &mark->i.i_list);
+        hlist_add_after_rcu(&last->i.i_list, &mark->i.i_list);
 out:
         fsnotify_recalc_inode_mask_locked(inode);
         spin_unlock(&inode->i_lock);
diff --git a/fs/notify/vfsmount_mark.c b/fs/notify/vfsmount_mark.c
index 4df58b8ea64a..68ca5a8704b5 100644
--- a/fs/notify/vfsmount_mark.c
+++ b/fs/notify/vfsmount_mark.c
@@ -33,12 +33,12 @@
 void fsnotify_clear_marks_by_mount(struct vfsmount *mnt)
 {
         struct fsnotify_mark *mark, *lmark;
-        struct hlist_node *pos, *n;
+        struct hlist_node *n;
         struct mount *m = real_mount(mnt);
         LIST_HEAD(free_list);
 
         spin_lock(&mnt->mnt_root->d_lock);
-        hlist_for_each_entry_safe(mark, pos, n, &m->mnt_fsnotify_marks, m.m_list) {
+        hlist_for_each_entry_safe(mark, n, &m->mnt_fsnotify_marks, m.m_list) {
                 list_add(&mark->m.free_m_list, &free_list);
                 hlist_del_init_rcu(&mark->m.m_list);
                 fsnotify_get_mark(mark);
@@ -71,12 +71,11 @@ static void fsnotify_recalc_vfsmount_mask_locked(struct vfsmount *mnt)
 {
         struct mount *m = real_mount(mnt);
         struct fsnotify_mark *mark;
-        struct hlist_node *pos;
         __u32 new_mask = 0;
 
         assert_spin_locked(&mnt->mnt_root->d_lock);
 
-        hlist_for_each_entry(mark, pos, &m->mnt_fsnotify_marks, m.m_list)
+        hlist_for_each_entry(mark, &m->mnt_fsnotify_marks, m.m_list)
                 new_mask |= mark->mask;
         m->mnt_fsnotify_mask = new_mask;
 }
@@ -114,11 +113,10 @@ static struct fsnotify_mark *fsnotify_find_vfsmount_mark_locked(struct fsnotify_
 {
         struct mount *m = real_mount(mnt);
         struct fsnotify_mark *mark;
-        struct hlist_node *pos;
 
         assert_spin_locked(&mnt->mnt_root->d_lock);
 
-        hlist_for_each_entry(mark, pos, &m->mnt_fsnotify_marks, m.m_list) {
+        hlist_for_each_entry(mark, &m->mnt_fsnotify_marks, m.m_list) {
                 if (mark->group == group) {
                         fsnotify_get_mark(mark);
                         return mark;
@@ -153,8 +151,7 @@ int fsnotify_add_vfsmount_mark(struct fsnotify_mark *mark,
                                int allow_dups)
 {
         struct mount *m = real_mount(mnt);
-        struct fsnotify_mark *lmark;
-        struct hlist_node *node, *last = NULL;
+        struct fsnotify_mark *lmark, *last = NULL;
         int ret = 0;
 
         mark->flags |= FSNOTIFY_MARK_FLAG_VFSMOUNT;
@@ -173,8 +170,8 @@ int fsnotify_add_vfsmount_mark(struct fsnotify_mark *mark,
         }
 
         /* should mark be in the middle of the current list? */
-        hlist_for_each_entry(lmark, node, &m->mnt_fsnotify_marks, m.m_list) {
-                last = node;
+        hlist_for_each_entry(lmark, &m->mnt_fsnotify_marks, m.m_list) {
+                last = lmark;
 
                 if ((lmark->group == group) && !allow_dups) {
                         ret = -EEXIST;
@@ -194,7 +191,7 @@ int fsnotify_add_vfsmount_mark(struct fsnotify_mark *mark,
 
         BUG_ON(last == NULL);
         /* mark should be the last entry.  last is the current last entry */
-        hlist_add_after_rcu(last, &mark->m.m_list);
+        hlist_add_after_rcu(&last->m.m_list, &mark->m.m_list);
 out:
         fsnotify_recalc_vfsmount_mask_locked(mnt);
         spin_unlock(&mnt->mnt_root->d_lock);
diff --git a/fs/ocfs2/dcache.c b/fs/ocfs2/dcache.c
index 8db4b58b2e4b..ef999729e274 100644
--- a/fs/ocfs2/dcache.c
+++ b/fs/ocfs2/dcache.c
@@ -169,11 +169,10 @@ struct dentry *ocfs2_find_local_alias(struct inode *inode,
                                       u64 parent_blkno,
                                       int skip_unhashed)
 {
-        struct hlist_node *p;
         struct dentry *dentry;
 
         spin_lock(&inode->i_lock);
-        hlist_for_each_entry(dentry, p, &inode->i_dentry, d_alias) {
+        hlist_for_each_entry(dentry, &inode->i_dentry, d_alias) {
                 spin_lock(&dentry->d_lock);
                 if (ocfs2_match_dentry(dentry, parent_blkno, skip_unhashed)) {
                         trace_ocfs2_find_local_alias(dentry->d_name.len,
diff --git a/fs/ocfs2/dlm/dlmrecovery.c b/fs/ocfs2/dlm/dlmrecovery.c
index 01ebfd0bdad7..eeac97bb3bfa 100644
--- a/fs/ocfs2/dlm/dlmrecovery.c
+++ b/fs/ocfs2/dlm/dlmrecovery.c
@@ -2083,7 +2083,6 @@ static void dlm_finish_local_lockres_recovery(struct dlm_ctxt *dlm,
                                               u8 dead_node, u8 new_master)
 {
         int i;
-        struct hlist_node *hash_iter;
         struct hlist_head *bucket;
         struct dlm_lock_resource *res, *next;
 
@@ -2114,7 +2113,7 @@ static void dlm_finish_local_lockres_recovery(struct dlm_ctxt *dlm,
          * if necessary */
         for (i = 0; i < DLM_HASH_BUCKETS; i++) {
                 bucket = dlm_lockres_hash(dlm, i);
-                hlist_for_each_entry(res, hash_iter, bucket, hash_node) {
+                hlist_for_each_entry(res, bucket, hash_node) {
                         if (!(res->state & DLM_LOCK_RES_RECOVERING))
                                 continue;
 
@@ -2273,7 +2272,6 @@ static void dlm_free_dead_locks(struct dlm_ctxt *dlm,
 
 static void dlm_do_local_recovery_cleanup(struct dlm_ctxt *dlm, u8 dead_node)
 {
-        struct hlist_node *iter;
         struct dlm_lock_resource *res;
         int i;
         struct hlist_head *bucket;
@@ -2299,7 +2297,7 @@ static void dlm_do_local_recovery_cleanup(struct dlm_ctxt *dlm, u8 dead_node)
          */
         for (i = 0; i < DLM_HASH_BUCKETS; i++) {
                 bucket = dlm_lockres_hash(dlm, i);
-                hlist_for_each_entry(res, iter, bucket, hash_node) {
+                hlist_for_each_entry(res, bucket, hash_node) {
                         /* always prune any $RECOVERY entries for dead nodes,
                          * otherwise hangs can occur during later recovery */
                         if (dlm_is_recovery_lock(res->lockname.name,
diff --git a/fs/super.c b/fs/super.c
index df6c2f4c6b59..7465d4364208 100644
--- a/fs/super.c
+++ b/fs/super.c
@@ -447,14 +447,13 @@ struct super_block *sget(struct file_system_type *type,
                         void *data)
 {
         struct super_block *s = NULL;
-        struct hlist_node *node;
         struct super_block *old;
         int err;
 
 retry:
         spin_lock(&sb_lock);
         if (test) {
-                hlist_for_each_entry(old, node, &type->fs_supers, s_instances) {
+                hlist_for_each_entry(old, &type->fs_supers, s_instances) {
                         if (!test(old, data))
                                 continue;
                         if (!grab_super(old))
@@ -554,10 +553,9 @@ void iterate_supers_type(struct file_system_type *type,
         void (*f)(struct super_block *, void *), void *arg)
 {
         struct super_block *sb, *p = NULL;
-        struct hlist_node *node;
 
         spin_lock(&sb_lock);
-        hlist_for_each_entry(sb, node, &type->fs_supers, s_instances) {
+        hlist_for_each_entry(sb, &type->fs_supers, s_instances) {
                 sb->s_count++;
                 spin_unlock(&sb_lock);
 
diff --git a/fs/sysfs/bin.c b/fs/sysfs/bin.c
index 2ce9a5db6ab5..15c68f9489ae 100644
--- a/fs/sysfs/bin.c
+++ b/fs/sysfs/bin.c
@@ -461,14 +461,13 @@ const struct file_operations bin_fops = {
 void unmap_bin_file(struct sysfs_dirent *attr_sd)
 {
         struct bin_buffer *bb;
-        struct hlist_node *tmp;
 
         if (sysfs_type(attr_sd) != SYSFS_KOBJ_BIN_ATTR)
                 return;
 
         mutex_lock(&sysfs_bin_lock);
 
-        hlist_for_each_entry(bb, tmp, &attr_sd->s_bin_attr.buffers, list) {
+        hlist_for_each_entry(bb, &attr_sd->s_bin_attr.buffers, list) {
                 struct inode *inode = file_inode(bb->file);
 
                 unmap_mapping_range(inode->i_mapping, 0, 0, 1);
diff --git a/fs/xfs/xfs_log_recover.c b/fs/xfs/xfs_log_recover.c
index 96fcbb85ff83..d1dba7ce75ae 100644
--- a/fs/xfs/xfs_log_recover.c
+++ b/fs/xfs/xfs_log_recover.c
@@ -1442,9 +1442,8 @@ xlog_recover_find_tid(
         xlog_tid_t              tid)
 {
         xlog_recover_t          *trans;
-        struct hlist_node       *n;
 
-        hlist_for_each_entry(trans, n, head, r_list) {
+        hlist_for_each_entry(trans, head, r_list) {
                 if (trans->r_log_tid == tid)
                         return trans;
         }