linux-kernel - Re: [patch 1/4] mmu

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Message-ID: <Pine.LNX.4.64.0801281044380.14003@schroedinger.engr.sgi.com>
Date:	Mon, 28 Jan 2008 10:44:56 -0800 (PST)
From:	Christoph Lameter <clameter@....com>
To:	Robin Holt <holt@....com>
cc:	Andrea Arcangeli <andrea@...ranet.com>,
	Avi Kivity <avi@...ranet.com>, Izik Eidus <izike@...ranet.com>,
	Nick Piggin <npiggin@...e.de>, kvm-devel@...ts.sourceforge.net,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>, steiner@....com,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	daniel.blueman@...drics.com, Hugh Dickins <hugh@...itas.com>
Subject: Re: [patch 1/4] mmu_notifier: Core code

On Sat, 26 Jan 2008, Robin Holt wrote:

> But what if the caller is already holding the mmap_sem?  Why force the
> acquire into this function?  Since we are dealing with a semaphore/mutex,

Then you need to call __register_mmu_notifier.
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