linux-kernel - Re: [patch 5/6] mmu_notifier: Support for drivers with revers maps (f.e. for XPmem)

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Message-ID: <20080228004226.GE8091@v2.random>
Date:	Thu, 28 Feb 2008 01:42:26 +0100
From:	Andrea Arcangeli <andrea@...ranet.com>
To:	Christoph Lameter <clameter@....com>
Cc:	Nick Piggin <nickpiggin@...oo.com.au>, akpm@...ux-foundation.org,
	Robin Holt <holt@....com>, Avi Kivity <avi@...ranet.com>,
	Izik Eidus <izike@...ranet.com>,
	kvm-devel@...ts.sourceforge.net,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	general@...ts.openfabrics.org,
	Steve Wise <swise@...ngridcomputing.com>,
	Roland Dreier <rdreier@...co.com>,
	Kanoj Sarcar <kanojsarcar@...oo.com>, steiner@....com,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	daniel.blueman@...drics.com
Subject: Re: [patch 5/6] mmu_notifier: Support for drivers with revers maps
	(f.e. for XPmem)

On Wed, Feb 27, 2008 at 02:43:41PM -0800, Christoph Lameter wrote:
> Nope. unmap_mapping_range is already handled by the range callbacks.

But they're called with atomic=1 on anything but anonymous memory. I
understood Andrew asked to remove the atomic param and to allow
sleeping for all kind of vmas. I also understood certain XPMEM
customers asked to use XPMEM on something more than anonymous memory.

> The situation that you are imagining has already been dealt with [..]

I guess there's some misunderstanding, I think Nick was referring to
the above problem.
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