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| author | David S. Miller <davem@davemloft.net> | 2011-03-08 14:59:28 -0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2011-03-08 14:59:28 -0800 |
| commit | 7b46ac4e77f3224a1befe032c77f1df31d1b42c4 (patch) | |
| tree | e0bd89b476e0f07e23f949366c283f7d7d6f9d4e | |
| parent | 5217e8794619ac0a29151f29be20c7d6188303ba (diff) | |
| download | linux-7b46ac4e77f3224a1befe032c77f1df31d1b42c4.tar.bz2 | |
inetpeer: Don't disable BH for initial fast RCU lookup.
If modifications on other cpus are ok, then modifications to
the tree during lookup done by the local cpu are ok too.
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | net/ipv4/inetpeer.c | 18 |
1 files changed, 9 insertions, 9 deletions
diff --git a/net/ipv4/inetpeer.c b/net/ipv4/inetpeer.c index f604ffdbea27..6442c35edb0b 100644 --- a/net/ipv4/inetpeer.c +++ b/net/ipv4/inetpeer.c @@ -206,16 +206,16 @@ static int addr_compare(const struct inetpeer_addr *a, }) /* - * Called with rcu_read_lock_bh() + * Called with rcu_read_lock() * Because we hold no lock against a writer, its quite possible we fall * in an endless loop. * But every pointer we follow is guaranteed to be valid thanks to RCU. * We exit from this function if number of links exceeds PEER_MAXDEPTH */ -static struct inet_peer *lookup_rcu_bh(const struct inetpeer_addr *daddr, - struct inet_peer_base *base) +static struct inet_peer *lookup_rcu(const struct inetpeer_addr *daddr, + struct inet_peer_base *base) { - struct inet_peer *u = rcu_dereference_bh(base->root); + struct inet_peer *u = rcu_dereference(base->root); int count = 0; while (u != peer_avl_empty) { @@ -231,9 +231,9 @@ static struct inet_peer *lookup_rcu_bh(const struct inetpeer_addr *daddr, return u; } if (cmp == -1) - u = rcu_dereference_bh(u->avl_left); + u = rcu_dereference(u->avl_left); else - u = rcu_dereference_bh(u->avl_right); + u = rcu_dereference(u->avl_right); if (unlikely(++count == PEER_MAXDEPTH)) break; } @@ -470,11 +470,11 @@ struct inet_peer *inet_getpeer(struct inetpeer_addr *daddr, int create) /* Look up for the address quickly, lockless. * Because of a concurrent writer, we might not find an existing entry. */ - rcu_read_lock_bh(); + rcu_read_lock(); sequence = read_seqbegin(&base->lock); - p = lookup_rcu_bh(daddr, base); + p = lookup_rcu(daddr, base); invalidated = read_seqretry(&base->lock, sequence); - rcu_read_unlock_bh(); + rcu_read_unlock(); if (p) { /* The existing node has been found. |