linux-kernel - Re: [patch 1/6] mmu

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Message-ID: <Pine.LNX.4.64.0801301113350.27491@schroedinger.engr.sgi.com>
Date:	Wed, 30 Jan 2008 11:14:12 -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 1/6] mmu_notifier: Core code

Ok. So I added the following patch:

---
 include/linux/mmu_notifier.h |    1 +
 mm/mmu_notifier.c            |   12 ++++++++++++
 2 files changed, 13 insertions(+)

Index: linux-2.6/include/linux/mmu_notifier.h
===================================================================
--- linux-2.6.orig/include/linux/mmu_notifier.h	2008-01-30 11:09:06.000000000 -0800
+++ linux-2.6/include/linux/mmu_notifier.h	2008-01-30 11:10:38.000000000 -0800
@@ -146,6 +146,7 @@ static inline void mmu_notifier_head_ini
 
 extern void mmu_rmap_notifier_register(struct mmu_rmap_notifier *mrn);
 extern void mmu_rmap_notifier_unregister(struct mmu_rmap_notifier *mrn);
+extern void mmu_rmap_export_page(struct page *page);
 
 extern struct hlist_head mmu_rmap_notifier_list;
 
Index: linux-2.6/mm/mmu_notifier.c
===================================================================
--- linux-2.6.orig/mm/mmu_notifier.c	2008-01-30 11:09:01.000000000 -0800
+++ linux-2.6/mm/mmu_notifier.c	2008-01-30 11:12:10.000000000 -0800
@@ -99,3 +99,15 @@ void mmu_rmap_notifier_unregister(struct
 }
 EXPORT_SYMBOL(mmu_rmap_notifier_unregister);
 
+/*
+ * Export a page.
+ *
+ * Pagelock must be held.
+ * Must be called before a page is put on an external rmap.
+ */
+void mmu_rmap_export_page(struct page *page)
+{
+	BUG_ON(!PageLocked(page));
+	SetPageExternalRmap(page);
+}
+EXPORT_SYMBOL(mmu_rmap_export_page);

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