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llist: llist_add() can use llist_add_batch() 

llist_add(new, head) can simply use llist_add_batch(new, new, head),
no need to duplicate the code.

This obviously uninlines llist_add() and to me this is a win. But we
can make llist_add_batch() inline if this is desirable, in this case
gcc can notice that new_first == new_last if the caller is llist_add().

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Andrey Vagin <avagin@openvz.org>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: David Howells <dhowells@redhat.com>
Cc: Huang Ying <ying.huang@intel.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Oleg Nesterov 2013-07-08 14:24:19 -07:00 committed by Al Viro
parent fb4214db50
commit e9a17bd73a
1 changed files with 4 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
include/linux/llist.h
View File

@ -142,6 +142,9 @@ static inline struct llist_node *llist_next(struct llist_node *node)
return node->next;
}
extern bool llist_add_batch(struct llist_node *new_first,
struct llist_node *new_last,
struct llist_head *head);
/**
* llist_add - add a new entry
* @new: new entry to be added
@ -151,13 +154,7 @@ static inline struct llist_node *llist_next(struct llist_node *node)
*/
static inline bool llist_add(struct llist_node *new, struct llist_head *head)
{
struct llist_node *first;
do {
new->next = first = ACCESS_ONCE(head->first);
} while (cmpxchg(&head->first, first, new) != first);
return !first;
return llist_add_batch(new, new, head);
}
/**
@ -173,9 +170,6 @@ static inline struct llist_node *llist_del_all(struct llist_head *head)
return xchg(&head->first, NULL);
}
extern bool llist_add_batch(struct llist_node *new_first,
struct llist_node *new_last,
struct llist_head *head);
extern struct llist_node *llist_del_first(struct llist_head *head);
#endif /* LLIST_H */