From fb4214db50b00558cc6e274c88b3f7325068e942 Mon Sep 17 00:00:00 2001
From: Oleg Nesterov <oleg@redhat.com>
Date: Mon, 8 Jul 2013 14:24:18 -0700
Subject: [PATCH] llist: fix/simplify llist_add() and llist_add_batch()
1. This is mostly theoretical, but llist_add*() need ACCESS_ONCE().
Otherwise it is not guaranteed that the first cmpxchg() uses the
same value for old_entry and new_last->next.
2. These helpers cache the result of cmpxchg() and read the initial
value of head->first before the main loop. I do not think this
makes sense. In the likely case cmpxchg() succeeds, otherwise
it doesn't hurt to reload head->first.
I think it would be better to simplify the code and simply read
->first before cmpxchg().
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>
---
include/linux/llist.h | 19 +++++++------------
lib/llist.c | 15 +++++----------
2 files changed, 12 insertions(+), 22 deletions(-)
diff --git a/include/linux/llist.h b/include/linux/llist.h
index a5199f6d0e825..3e2b969d68f69 100644
--- a/include/linux/llist.h
+++ b/include/linux/llist.h
@@ -151,18 +151,13 @@ 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 *entry, *old_entry;
-
- entry = head->first;
- for (;;) {
- old_entry = entry;
- new->next = entry;
- entry = cmpxchg(&head->first, old_entry, new);
- if (entry == old_entry)
- break;
- }
-
- return old_entry == NULL;
+ struct llist_node *first;
+
+ do {
+ new->next = first = ACCESS_ONCE(head->first);
+ } while (cmpxchg(&head->first, first, new) != first);
+
+ return !first;
}
/**
diff --git a/lib/llist.c b/lib/llist.c
index 4a15115e90f84..4a70d120138cc 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);
--
GitLab