tree 7be26ef02ab2f2979be9a3cdeb36ed1bafc51354
parent e292f05e0df73f9fcc93329663936e1ded97a988
author Eric Dumazet <edumazet@google.com> 1570763866 -0700
committer David S. Miller <davem@davemloft.net> 1570986788 -0700

tcp: annotate sk->sk_wmem_queued lockless reads

For the sake of tcp_poll(), there are few places where we fetch
sk->sk_wmem_queued while this field can change from IRQ or other cpu.

We need to add READ_ONCE() annotations, and also make sure write
sides use corresponding WRITE_ONCE() to avoid store-tearing.

sk_wmem_queued_add() helper is added so that we can in
the future convert to ADD_ONCE() or equivalent if/when
available.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>