linux-kernel - Re: [PATCH 05/28] fs: introduce new ->get_poll_head and ->poll

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Message-ID: <20180321090823.GE14085@kroah.com>
Date:   Wed, 21 Mar 2018 10:08:23 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Christoph Hellwig <hch@....de>
Cc:     viro@...iv.linux.org.uk, Avi Kivity <avi@...lladb.com>,
        linux-aio@...ck.org, linux-fsdevel@...r.kernel.org,
        netdev@...r.kernel.org, linux-api@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 05/28] fs: introduce new ->get_poll_head and ->poll_mask
 methods

On Wed, Mar 21, 2018 at 08:40:09AM +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.
> 
> Signed-off-by: Christoph Hellwig <hch@....de>

Reviewed-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>