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From: Christoph Hellwig <hch@infradead.org>
Subject: Re: [PATCH 12/12] vmscan: Do not writeback pages in direct reclaim
Date: Wed, 16 Jun 2010 01:07:57 -0400
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Cc: Rik van Riel <riel@redhat.com>, Mel Gorman <mel@csn.ul.ie>,
	linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org,
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To: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
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On Wed, Jun 16, 2010 at 09:39:58AM +0900, KAMEZAWA Hiroyuki wrote:
> Hmm. But I don't expect copy_from/to_user is called in very deep stack.

Actually it is.  The poll code mentioned earlier in this thread is just
want nasty example.  I'm pretty sure there are tons of others in ioctl
code, as various ioctl implementations have been found to be massive
stack hogs in the past, even worse for out of tree drivers.

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