linux-kernel - Re: [BUG REPORT] [mm-hotplug, aio] aio ring

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Message-Id: <20121130000043.cf356676.akpm@linux-foundation.org>
Date:	Fri, 30 Nov 2012 00:00:43 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Kamezawa Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	Lin Feng <linfeng@...fujitsu.com>, viro@...iv.linux.org.uk,
	bcrl@...ck.org, mhocko@...e.cz, hughd@...gle.com, cl@...ux.com,
	mgorman@...e.de, minchan@...nel.org,
	isimatu.yasuaki@...fujitsu.com, laijs@...fujitsu.com,
	wency@...fujitsu.com, tangchen@...fujitsu.com,
	linux-fsdevel@...r.kernel.org, linux-aio@...ck.org,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [BUG REPORT] [mm-hotplug, aio] aio ring_pages can't be offlined

On Fri, 30 Nov 2012 16:13:16 +0900 Kamezawa Hiroyuki <kamezawa.hiroyu@...fujitsu.com> wrote:

> > What about futexes?
> >
> 
> IIUC, futex's key is now a pair of (mm,address) or (inode, pgoff).
> Then, get_user_page() in futex.c will release the page by put_page().
> 'struct page' is just touched by get_futex_key() to obtain page->mapping info.

Ah yes, that page is unpinned before syscall return.

	grep -rl get_user_pages .

Gad.

These should be audited.  The great majority will be simple and OK,
but drivers/media, drivers/infiniband and net/rds could be problematic.
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