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    SubjectRe: [RFC][PATCH v3 2/6] mm, directio: fix fork vs direct-io race (read(2) side IOW gup(write) side)
    On Tue, Apr 14, 2009 at 02:10:08PM -0400, Jeff Moyer wrote:
    > Really? I don't actually see that in the code, have I missed it?

    Checking the spinlock version, when any writer is waiting, the
    sem->wait_list won't empty and down_read will wait too. The wakeup is
    FIFO with __rwsem_do_wake is doing a wake-one if first one in queue is
    a down_write. So it looks ok to me. asm version should have an
    equivalent logic.


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