[patch 3/4] mm: Dont forget to save file map softdiry bit on unmap

[Cyrill Gorcunov <gorcunov@openvz.org>]

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pte_file_mksoft_dirty operates with argument passed by
a value and returns modified result thus need to assign
@ptfile here, otherwise it's nop operation which may lead
to lose of softdirty bit.

CC: Pavel Emelyanov <xemul@parallels.com>
CC: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
---
 mm/rmap.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Index: linux-2.6.git/mm/rmap.c
===================================================================
--- linux-2.6.git.orig/mm/rmap.c
+++ linux-2.6.git/mm/rmap.c
@@ -1339,7 +1339,7 @@ static int try_to_unmap_cluster(unsigned
 		if (page->index != linear_page_index(vma, address)) {
 			pte_t ptfile = pgoff_to_pte(page->index);
 			if (pte_soft_dirty(pteval))
-				pte_file_mksoft_dirty(ptfile);
+				ptfile = pte_file_mksoft_dirty(ptfile);
 			set_pte_at(mm, address, pte, ptfile);
 		}
 

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