netdev - Re: POLLPRI/poll() behavior change since 2.6.31

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Message-ID: <alpine.DEB.2.00.1101061429080.4928@davide-lnx1>
Date:	Thu, 6 Jan 2011 14:40:46 -0800 (PST)
From:	Davide Libenzi <davidel@...ilserver.org>
To:	Eric Dumazet <eric.dumazet@...il.com>
cc:	Leonardo Chiquitto <leonardo.lists@...il.com>,
	netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>
Subject: Re: POLLPRI/poll() behavior change since 2.6.31

On Thu, 6 Jan 2011, Eric Dumazet wrote:

> Hmm, this is because 	sock_def_readable() uses :
> 
> wake_up_interruptible_sync_poll(&wq->wait, POLLIN | POLLRDNORM |
> POLLRDBAND);
> 
> So POLLPRI bit is not signaled. 
> 
> I would just add POLLPRI flag in sock_def_readable()
> 
> (Alternatively, define a tcp_def_readable() function to pass POLLPRI
> only if TCP_URG is set, but is it worth the pain for a seldom used
> feature ?)

It would be kinda cleaner though, /me thinks.


- Davide


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