linux-kernel - Re: [PATCH v2 1/2] epoll: introduce POLLFREE to flush ->signalfd

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Date:	Wed, 29 Feb 2012 12:16:32 -0800
From:	Andrew Lutomirski <luto@....edu>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Davide Libenzi <davidel@...ilserver.org>,
	Eric Dumazet <eric.dumazet@...il.com>,
	Greg KH <greg@...ah.com>, Jason Baron <jbaron@...hat.com>,
	Roland McGrath <roland@...k.frob.com>,
	Eugene Teo <eugeneteo@...nel.sg>,
	Maxime Bizon <mbizon@...ebox.fr>,
	Denys Vlasenko <dvlasenk@...hat.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/2] epoll: introduce POLLFREE to flush ->signalfd_wqh
 before kfree()

On Wed, Feb 29, 2012 at 12:06 PM, Oleg Nesterov <oleg@...hat.com> wrote:
> On 02/29, Andy Lutomirski wrote:
>>
>> On 02/24/2012 11:07 AM, Oleg Nesterov wrote:
>> > This patch adds the special event, POLLFREE, currently only for
>> > epoll. It expects that init_poll_funcptr()'ed hook should do the
>> > necessary cleanup. Perhaps it should be defined as EPOLLFREE in
>> > eventpoll.
>>
>> I have a bunch of userspace code that uses signalfd via epoll.  Does
>> this affect the ABI?
>
> I hope not ;)
>

Excellent!

To avoid further confusion, would it make sense to update the comment
in poll.h to indicate that POLLFREE is only for epoll and is internal
to the kernel?

--Andy
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