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

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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>
This commit is contained in:
Cyrill Gorcunov 2014-06-04 16:06:42 -07:00 • committed by Linus Torvalds
commit b43790eedd
1 changed files with 1 additions and 1 deletions
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2
mm/rmap.c
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@ -1361,7 +1361,7 @@ static int try_to_unmap_cluster(unsigned long cursor, unsigned int *mapcount,
if (page->index != linear_page_index(vma, address)) { if (page->index != linear_page_index(vma, address)) {
pte_t ptfile = pgoff_to_pte(page->index); pte_t ptfile = pgoff_to_pte(page->index);
if (pte_soft_dirty(pteval)) if (pte_soft_dirty(pteval))
pte_file_mksoft_dirty(ptfile); ptfile = pte_file_mksoft_dirty(ptfile);
set_pte_at(mm, address, pte, ptfile); set_pte_at(mm, address, pte, ptfile);
} }