diff options
| author | Eric Dumazet <edumazet@google.com> | 2012-06-20 04:02:10 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2012-06-20 14:38:55 -0700 |
| commit | da55737467c1c3bc02271039c088171d82e0796f (patch) | |
| tree | 13598d84d783a3ca1b7789f17eda28f3554ef080 /net/ipv4/inetpeer.c | |
| parent | 6dab015cf8c9d2fabb13d0332998bc440e9c6555 (diff) | |
| download | linux-da55737467c1c3bc02271039c088171d82e0796f.tar.bz2 | |
inetpeer: inetpeer_invalidate_tree() cleanup
No need to use cmpxchg() in inetpeer_invalidate_tree() since we hold
base lock.
Also use correct rcu annotations to remove sparse errors
(CONFIG_SPARSE_RCU_POINTER=y)
net/ipv4/inetpeer.c:144:19: error: incompatible types in comparison
expression (different address spaces)
net/ipv4/inetpeer.c:149:20: error: incompatible types in comparison
expression (different address spaces)
net/ipv4/inetpeer.c:595:10: error: incompatible types in comparison
expression (different address spaces)
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Steffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/inetpeer.c')
| -rw-r--r-- | net/ipv4/inetpeer.c | 34 |
1 files changed, 15 insertions, 19 deletions
diff --git a/net/ipv4/inetpeer.c b/net/ipv4/inetpeer.c index cac02ad1425d..da90a8cab614 100644 --- a/net/ipv4/inetpeer.c +++ b/net/ipv4/inetpeer.c @@ -126,7 +126,7 @@ int inet_peer_maxttl __read_mostly = 10 * 60 * HZ; /* usual time to live: 10 min static void inetpeer_gc_worker(struct work_struct *work) { - struct inet_peer *p, *n; + struct inet_peer *p, *n, *c; LIST_HEAD(list); spin_lock_bh(&gc_lock); @@ -138,17 +138,19 @@ static void inetpeer_gc_worker(struct work_struct *work) list_for_each_entry_safe(p, n, &list, gc_list) { - if(need_resched()) + if (need_resched()) cond_resched(); - if (p->avl_left != peer_avl_empty) { - list_add_tail(&p->avl_left->gc_list, &list); - p->avl_left = peer_avl_empty; + c = rcu_dereference_protected(p->avl_left, 1); + if (c != peer_avl_empty) { + list_add_tail(&c->gc_list, &list); + p->avl_left = peer_avl_empty_rcu; } - if (p->avl_right != peer_avl_empty) { - list_add_tail(&p->avl_right->gc_list, &list); - p->avl_right = peer_avl_empty; + c = rcu_dereference_protected(p->avl_right, 1); + if (c != peer_avl_empty) { + list_add_tail(&c->gc_list, &list); + p->avl_right = peer_avl_empty_rcu; } n = list_entry(p->gc_list.next, struct inet_peer, gc_list); @@ -587,23 +589,17 @@ static void inetpeer_inval_rcu(struct rcu_head *head) void inetpeer_invalidate_tree(struct inet_peer_base *base) { - struct inet_peer *old, *new, *prev; + struct inet_peer *root; write_seqlock_bh(&base->lock); - old = base->root; - if (old == peer_avl_empty_rcu) - goto out; - - new = peer_avl_empty_rcu; - - prev = cmpxchg(&base->root, old, new); - if (prev == old) { + root = rcu_deref_locked(base->root, base); + if (root != peer_avl_empty) { + base->root = peer_avl_empty_rcu; base->total = 0; - call_rcu(&prev->gc_rcu, inetpeer_inval_rcu); + call_rcu(&root->gc_rcu, inetpeer_inval_rcu); } -out: write_sequnlock_bh(&base->lock); } EXPORT_SYMBOL(inetpeer_invalidate_tree); |