pipe: use event aware wakeups
Send the events the wakeup refers to, so that epoll, and even the new poll code in fs/select.c can avoid wakeups if the events do not match the requested set. Signed-off-by: NDavide Libenzi <davidel@xmailserver.org> Acked-by: NDavid S. Miller <davem@davemloft.net> Acked-by: NEric Dumazet <eric.dumazet@gmail.com> Cc: Jens Axboe <axboe@kernel.dk> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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