linux-kernel - Re: [PATCH] mmu notifiers #v2

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Message-ID: <20080116010601.GF7059@v2.random>
Date:	Wed, 16 Jan 2008 02:06:01 +0100
From:	Andrea Arcangeli <andrea@...ranet.com>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc:	Christoph Lameter <clameter@....com>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, kvm-devel@...ts.sourceforge.net,
	Avi Kivity <avi@...ranet.com>, Izik Eidus <izike@...ranet.com>,
	daniel.blueman@...drics.com, holt@....com, steiner@....com,
	Andrew Morton <akpm@...l.org>, Hugh Dickins <hugh@...itas.com>,
	Nick Piggin <npiggin@...e.de>
Subject: Re: [PATCH] mmu notifiers #v2

On Wed, Jan 16, 2008 at 07:18:53AM +1100, Benjamin Herrenschmidt wrote:
> Do you have cases where it's -not- called with the PTE lock held ?

For invalidate_page no because currently it's only called next to the
ptep_get_and_clear that modifies the pte and requires the pte
lock. invalidate_range/release are called w/o pte lock held.
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