linux-kernel - [PATCH 2/3] mm: postpone migrated page mapping reset

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Message-ID: <20120106173850.11700.42919.stgit@zurg>
Date:	Fri, 06 Jan 2012 21:38:51 +0400
From:	Konstantin Khlebnikov <khlebnikov@...nvz.org>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Hugh Dickins <hughd@...gle.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: [PATCH 2/3] mm: postpone migrated page mapping reset

Postpone resetting page->mapping till final remove_migration_ptes(),
otherwise expression PageAnon(migration_entry_to_page(entry)) does not work.

Signed-off-by: Konstantin Khlebnikov <khlebnikov@...nvz.org>
---
 mm/migrate.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/mm/migrate.c b/mm/migrate.c
index 177aca4..f59cd76 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -386,7 +386,6 @@ void migrate_page_copy(struct page *newpage, struct page *page)
 	ClearPageSwapCache(page);
 	ClearPagePrivate(page);
 	set_page_private(page, 0);
-	page->mapping = NULL;
 
 	/*
 	 * If any waiters have accumulated on the new page then
@@ -614,6 +613,7 @@ static int move_to_new_page(struct page *newpage, struct page *page,
 	} else {
 		if (remap_swapcache)
 			remove_migration_ptes(page, newpage);
+		page->mapping = NULL;
 	}
 
 	unlock_page(newpage);

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