s390/mm: correct transfer of dirty & young bits in __pmd_to_pte

The dirty & young bit from the pmd is not copied correctly to the
pseudo pte in __pmd_to_pte. In fact it is not copied at all, the
bits get lost. As the old style huge page currently does not need
the dirty & young information this has no effect, but may be needed
in the future.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

diff --git a/arch/s390/mm/hugetlbpage.c b/arch/s390/mm/hugetlbpage.c
index 210ffed..c67e8bf 100644 (file)
--- a/arch/s390/mm/hugetlbpage.c
+++ b/arch/s390/mm/hugetlbpage.c
@@ -70,8 +70,8 @@ static inline pte_t __pmd_to_pte(pmd_t pmd)
                pte_val(pte) |= (pmd_val(pmd) & _SEGMENT_ENTRY_WRITE) << 4;
                pte_val(pte) |= (pmd_val(pmd) & _SEGMENT_ENTRY_INVALID) << 5;
                pte_val(pte) |= (pmd_val(pmd) & _SEGMENT_ENTRY_PROTECT);
-               pmd_val(pmd) |= (pte_val(pte) & _PAGE_DIRTY) << 10;
-               pmd_val(pmd) |= (pte_val(pte) & _PAGE_YOUNG) << 10;
+               pte_val(pte) |= (pmd_val(pmd) & _SEGMENT_ENTRY_DIRTY) >> 10;
+               pte_val(pte) |= (pmd_val(pmd) & _SEGMENT_ENTRY_YOUNG) >> 10;
        } else
                pte_val(pte) = _PAGE_INVALID;
        return pte;