Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

Pull more vfs stuff from Al Viro:
 "O_TMPFILE ABI changes, Oleg's fput() series, misc cleanups, including
  making simple_lookup() usable for filesystems with non-NULL s_d_op,
  which allows us to get rid of quite a bit of ugliness"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
  sunrpc: now we can just set ->s_d_op
  cgroup: we can use simple_lookup() now
  efivarfs: we can use simple_lookup() now
  make simple_lookup() usable for filesystems that set ->s_d_op
  configfs: don't open-code d_alloc_name()
  __rpc_lookup_create_exclusive: pass string instead of qstr
  rpc_create_*_dir: don't bother with qstr
  llist: llist_add() can use llist_add_batch()
  llist: fix/simplify llist_add() and llist_add_batch()
  fput: turn "list_head delayed_fput_list" into llist_head
  fs/file_table.c:fput(): add comment
  Safer ABI for O_TMPFILE

1 files changed, 5 insertions, 10 deletions

diff --git a/lib/llist.c b/lib/llist.c
index 4a15115e90f8..4a70d120138c 100644
--- a/lib/llist.c
+++ b/lib/llist.c
@@ -39,18 +39,13 @@
 bool llist_add_batch(struct llist_node *new_first, struct llist_node *new_last,
                      struct llist_head *head)
 {
-        struct llist_node *entry, *old_entry;
+        struct llist_node *first;
 
-        entry = head->first;
-        for (;;) {
-                old_entry = entry;
-                new_last->next = entry;
-                entry = cmpxchg(&head->first, old_entry, new_first);
-                if (entry == old_entry)
-                        break;
-        }
+        do {
+                new_last->next = first = ACCESS_ONCE(head->first);
+        } while (cmpxchg(&head->first, first, new_first) != first);
 
-        return old_entry == NULL;
+        return !first;
 }
 EXPORT_SYMBOL_GPL(llist_add_batch);