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| author | Huang Ying <ying.huang@intel.com> | 2011-09-08 14:00:42 +0800 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2011-10-04 11:30:53 +0200 |
| commit | 1230db8e1543c0471dd165727d34647ab098cc1e (patch) | |
| tree | 6667af62e0a0bb24b315f5b9e61ea7635293135b /lib/llist.c | |
| parent | 22f92bacbeea24b20e447444c28e7cad9f1ac3f8 (diff) | |
| download | lwn-1230db8e1543c0471dd165727d34647ab098cc1e.tar.gz lwn-1230db8e1543c0471dd165727d34647ab098cc1e.zip | |
llist: Make some llist functions inline
Because llist code will be used in performance critical scheduler
code path, make llist_add() and llist_del_all() inline to avoid
function calling overhead and related 'glue' overhead.
Signed-off-by: Huang Ying <ying.huang@intel.com>
Acked-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1315461646-1379-2-git-send-email-ying.huang@intel.com
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'lib/llist.c')
| -rw-r--r-- | lib/llist.c | 40 |
1 files changed, 0 insertions, 40 deletions
diff --git a/lib/llist.c b/lib/llist.c index da445724fa1f..3e3fa9139c41 100644 --- a/lib/llist.c +++ b/lib/llist.c @@ -30,28 +30,6 @@ #include <asm/system.h> /** - * llist_add - add a new entry - * @new: new entry to be added - * @head: the head for your lock-less list - */ -void llist_add(struct llist_node *new, struct llist_head *head) -{ - struct llist_node *entry, *old_entry; - -#ifndef CONFIG_ARCH_HAVE_NMI_SAFE_CMPXCHG - BUG_ON(in_nmi()); -#endif - - entry = head->first; - do { - old_entry = entry; - new->next = entry; - cpu_relax(); - } while ((entry = cmpxchg(&head->first, old_entry, new)) != old_entry); -} -EXPORT_SYMBOL_GPL(llist_add); - -/** * llist_add_batch - add several linked entries in batch * @new_first: first entry in batch to be added * @new_last: last entry in batch to be added @@ -109,21 +87,3 @@ struct llist_node *llist_del_first(struct llist_head *head) return entry; } EXPORT_SYMBOL_GPL(llist_del_first); - -/** - * llist_del_all - delete all entries from lock-less list - * @head: the head of lock-less list to delete all entries - * - * If list is empty, return NULL, otherwise, delete all entries and - * return the pointer to the first entry. The order of entries - * deleted is from the newest to the oldest added one. - */ -struct llist_node *llist_del_all(struct llist_head *head) -{ -#ifndef CONFIG_ARCH_HAVE_NMI_SAFE_CMPXCHG - BUG_ON(in_nmi()); -#endif - - return xchg(&head->first, NULL); -} -EXPORT_SYMBOL_GPL(llist_del_all); |