linux-kernel - Re: [patch 1/2] epoll fix own poll()

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Message-ID: <alpine.DEB.1.10.0901291039360.15448@alien.or.mcafeemobile.com>
Date:	Thu, 29 Jan 2009 10:43:38 -0800 (PST)
From:	Davide Libenzi <davidel@...ilserver.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Pavel Pisa <pisa@....felk.cvut.cz>
Subject: Re: [patch 1/2] epoll fix own poll()

On Thu, 29 Jan 2009, Andrew Morton wrote:

> On Thu, 29 Jan 2009 10:32:38 -0800 (PST) Davide Libenzi <davidel@...ilserver.org> wrote:
> 
> > On Thu, 29 Jan 2009, Andrew Morton wrote:
> > 
> > > But which kernel version are you looking to get this merged into?
> > 
> > The limit reworking one, ASAP. The epoll poll fix, dunno.
> > I'd like to see it staged in your tree for a bit. How much timeframe 
> > difference are we looking at, from .29 to .30?
> 
> The usual - 2.5 months(ish)
> 
> What is the impact of the bug which this patch fixes?

I think we can move the poll-fix (and definitely the debug-nuke-fix) to .30.
The bug happens when you add an epoll fd inside another wait container 
(epoll, poll, select). You may get a wakeup, to only find out later that 
epoll_wait() has no event for you. The bug has been there since day-1, and 
it has only recently been noticed.
Since it is quite some coe change, I'd like it to stage in your toxic tree 
for a while :)


- Davide


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