On Sat, Jan 06, 2018 at 07:12:42PM +0000, Al Viro wrote: > On Thu, Jan 04, 2018 at 09:00:15AM +0100, Christoph Hellwig wrote: > > ->get_poll_head returns the waitqueue that the poll operation is going > > to sleep on. Note that this means we can only use a single waitqueue > > for the poll, unlike some current drivers that use two waitqueues for > > different events. But now that we have keyed wakeups and heavily use > > those for poll there aren't that many good reason left to keep the > > multiple waitqueues, and if there are any ->poll is still around, the > > driver just won't support aio poll. > > *UGH* > > Gotta love the optimism, but have you actually done the conversion? > I'm particularly suspicious about the locking rules here... I've done just about everything but random drivers. Which is the ones where people care about performance and thus aio poll. I suspect that we will have various odd cruft drivers that will be left alone.
