Commit b43790ee authored Jun 04, 2014 by Cyrill Gorcunov Committed by Linus Torvalds Jun 04, 2014

mm: softdirty: don't forget to save file map softdiry bit on unmap

pte_file_mksoft_dirty operates with argument passed by a value and
returns modified result thus we need to assign @ptfile here, otherwise
itis a no-op which may lead to loss of the softdirty bit.

Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Cc: Pavel Emelyanov <xemul@parallels.com>
Cc: Hugh Dickins <hughd@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

parent 0bf07331

mm/rmap.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -1361,7 +1361,7 @@ static int try_to_unmap_cluster(unsigned long cursor, unsigned int *mapcount,
		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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