linux-kernel - Re: [PATCH 03/31] fs: introduce new ->get_poll_head and ->poll

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Message-ID: <20180106191242.GI21978@ZenIV.linux.org.uk>
Date:   Sat, 6 Jan 2018 19:12:42 +0000
From:   Al Viro <viro@...IV.linux.org.uk>
To:     Christoph Hellwig <hch@....de>
Cc:     Avi Kivity <avi@...lladb.com>, linux-aio@...ck.org,
        linux-fsdevel@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 03/31] fs: introduce new ->get_poll_head and ->poll_mask
 methods

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...