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bpf: sockmap, hash table is RCU so readers do not need locks
author
John Fastabend
<john.fastabend@gmail.com>
Thu, 5 Jul 2018 15:06:01 +0000
(08:06 -0700)
committer
Alexei Starovoitov
<ast@kernel.org>
Sat, 7 Jul 2018 22:16:58 +0000
(15:16 -0700)
This removes locking from readers of RCU hash table. Its not
necessary.
Fixes:
81110384441a
("bpf: sockmap, add hash map support")
Signed-off-by: John Fastabend <john.fastabend@gmail.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
kernel/bpf/sockmap.c
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diff --git
a/kernel/bpf/sockmap.c
b/kernel/bpf/sockmap.c
index
3847a7c
..
00fb2e3
100644
(file)
--- a/
kernel/bpf/sockmap.c
+++ b/
kernel/bpf/sockmap.c
@@
-2467,10
+2467,8
@@
struct sock *__sock_hash_lookup_elem(struct bpf_map *map, void *key)
b = __select_bucket(htab, hash);
head = &b->head;
- raw_spin_lock_bh(&b->lock);
l = lookup_elem_raw(head, hash, key, key_size);
sk = l ? l->sk : NULL;
- raw_spin_unlock_bh(&b->lock);
return sk;
}