llist: Add back llist_add_batch() and llist_del_first() prototypes

Commit 1230db8e ("llist: Make some llist functions inline")
has deleted the definitions, causing problems for (not upstream yet)
code that tries to make use of them.
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Cc: Huang Ying <ying.huang@intel.com>
Cc: David Miller <davem@davemloft.net>
Link: http://lkml.kernel.org/r/20111005172528.0d0a8afc65acef7ace22a24e@canb.auug.org.auSigned-off-by: Ingo Molnar <mingo@elte.hu>

include/linux/llist.h

@@ -178,4 +178,10 @@ 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 */