linux-kernel - Re: [RFC][PATCH v3 4/6] aio: Don't inherit aio ring memory at fork

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Message-ID: <20090414134109.GD28265@random.random>
Date:	Tue, 14 Apr 2009 15:41:09 +0200
From:	Andrea Arcangeli <aarcange@...hat.com>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Zach Brown <zach.brown@...cle.com>,
	Jens Axboe <jens.axboe@...cle.com>, linux-api@...r.kernel.org,
	Linus Torvalds <torvalds@...l.org>,
	Andrew Morton <akpm@...l.org>,
	Nick Piggin <nickpiggin@...oo.com.au>,
	Jeff Moyer <jmoyer@...hat.com>, linux-mm@...ck.org,
	linux-fsdevel@...r.kernel.org
Subject: Re: [RFC][PATCH v3 4/6] aio: Don't inherit aio ring memory at fork

On Tue, Apr 14, 2009 at 03:20:20PM +0900, KOSAKI Motohiro wrote:
> In addition, This patch has good side effect. it also fix "get_user_pages() vs fork" problem.

Yes, patches like 3/6, 4/6, and 6/6 are the side effect of not fixing
the core race in gup and spreading the new rwsem around the gup users,
instead of sticking to a page-granular PG_flag touched at the same
time atomic_inc runs on page->_count.
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