s390/mm: fix huge pte soft dirty copying

If the pmd is soft dirty we must mark the pte as soft dirty (and not dirty).
This fixes some cases for guest migration with huge page backings.

Cc: <stable@vger.kernel.org> # 4.8
Fixes: bc29b7ac1d9f ("s390/mm: clean up pte/pmd encoding")
Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com>
Reviewed-by: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>

diff --git a/arch/s390/mm/hugetlbpage.c b/arch/s390/mm/hugetlbpage.c
index 82df06d720e8c254e4134489b045a34b5485fe18..3b5a4d25ca9b5e069975516050f0517543157ac4 100644 (file)
--- a/arch/s390/mm/hugetlbpage.c
+++ b/arch/s390/mm/hugetlbpage.c
@@ -117,7 +117,7 @@ static inline pte_t __rste_to_pte(unsigned long rste)
                                             _PAGE_YOUNG);
 #ifdef CONFIG_MEM_SOFT_DIRTY
                pte_val(pte) |= move_set_bit(rste, _SEGMENT_ENTRY_SOFT_DIRTY,
-                                            _PAGE_DIRTY);
+                                            _PAGE_SOFT_DIRTY);
 #endif
                pte_val(pte) |= move_set_bit(rste, _SEGMENT_ENTRY_NOEXEC,
                                             _PAGE_NOEXEC);