linux-kernel - Re: [patch 3/6] mmu_notifier: invalidate_page callbacks for subsystems with rmap

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Date:	Wed, 30 Jan 2008 12:03:12 -0600
From:	Robin Holt <holt@....com>
To:	Christoph Lameter <clameter@....com>
Cc:	Andrea Arcangeli <andrea@...ranet.com>, Robin Holt <holt@....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 3/6] mmu_notifier: invalidate_page callbacks for
	subsystems with rmap

This is the second part of a patch posted to patch 1/6.


Index: git-linus/mm/rmap.c
===================================================================
--- git-linus.orig/mm/rmap.c	2008-01-30 11:55:56.000000000 -0600
+++ git-linus/mm/rmap.c	2008-01-30 12:01:28.000000000 -0600
@@ -476,8 +476,10 @@ int page_mkclean(struct page *page)
 		struct address_space *mapping = page_mapping(page);
 		if (mapping) {
 			ret = page_mkclean_file(mapping, page);
-			if (unlikely(PageExternalRmap(page)))
+			if (unlikely(PageExternalRmap(page))) {
 				mmu_rmap_notifier(invalidate_page, page);
+				ClearPageExported(page);
+			}
 			if (page_test_dirty(page)) {
 				page_clear_dirty(page);
 				ret = 1;
@@ -980,8 +982,10 @@ int try_to_unmap(struct page *page, int 
 	else
 		ret = try_to_unmap_file(page, migration);
 
-	if (unlikely(PageExternalRmap(page)))
+	if (unlikely(PageExternalRmap(page))) {
 		mmu_rmap_notifier(invalidate_page, page);
+		ClearPageExported(page);
+	}
 
 	if (!page_mapped(page))
 		ret = SWAP_SUCCESS;
--
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