From: Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
To: Stephen Hemminger <shemminger@osdl.org>
Cc: David Miller <davem@davemloft.net>, netdev@vger.kernel.org
Subject: Re: [PATCH 4/6] net neighbour: convert to RCU
Date: Tue, 29 Aug 2006 19:28:16 +0400 [thread overview]
Message-ID: <20060829152816.GA24283@ms2.inr.ac.ru> (raw)
In-Reply-To: <20060828230915.587544687@localhost.localdomain>
Hello!
> @@ -346,8 +354,8 @@ struct neighbour *neigh_lookup(struct ne
>
> NEIGH_CACHE_STAT_INC(tbl, lookups);
>
> - read_lock_bh(&tbl->lock);
> - hlist_for_each_entry(n, tmp, &tbl->hash_buckets[hash_val], hlist) {
> + rcu_read_lock();
> + hlist_for_each_entry_rcu(n, tmp, &tbl->hash_buckets[hash_val], hlist) {
> if (dev == n->dev && !memcmp(n->primary_key, pkey, key_len)) {
> neigh_hold(n);
> NEIGH_CACHE_STAT_INC(tbl, hits);
Sure? Seems, you cannot grab refcnt here, the entry can be already
released.
Probably, you should do atomic_inc_and_test() here and restart lookup,
if it fails.
Alexey
next prev parent reply other threads:[~2006-08-29 15:29 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-08-28 23:07 [PATCH 0/6] Lockless neighbour table Stephen Hemminger
2006-08-28 23:07 ` [PATCH 1/6] net neighbor: convert top level list to RCU Stephen Hemminger
2006-08-28 23:07 ` [PATCH 2/6] neighbour: convert neighbour hash table to hlist Stephen Hemminger
2006-08-28 23:07 ` [PATCH 3/6] neighbour: convert pneigh " Stephen Hemminger
2006-08-28 23:07 ` [PATCH 4/6] net neighbour: convert to RCU Stephen Hemminger
2006-08-29 15:28 ` Alexey Kuznetsov [this message]
2006-08-29 18:22 ` Stephen Hemminger
2006-08-29 18:34 ` Martin Josefsson
2006-08-29 20:17 ` Stephen Hemminger
2006-08-29 21:17 ` Alexey Kuznetsov
2006-08-29 21:46 ` Stephen Hemminger
2006-08-29 22:16 ` Alexey Kuznetsov
2006-08-29 23:00 ` Stephen Hemminger
2006-08-29 23:21 ` Alexey Kuznetsov
2006-08-29 23:49 ` Stephen Hemminger
2006-08-30 0:06 ` Alexey Kuznetsov
2006-08-29 23:36 ` Alexey Kuznetsov
2006-08-28 23:07 ` [PATCH 5/6] neighbour: convert lookup to sequence lock Stephen Hemminger
2006-08-28 23:07 ` [PATCH 6/6] neighbour: convert hard header cache to sequence number Stephen Hemminger
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