s390/mm: Fix cmma unused transfer from pgste into pte

The last pgtable rework silently disabled the CMMA unused state by
setting a local pte variable (a parameter) instead of propagating it
back into the caller. Fix it.

Fixes: ebde765c0e85 ("s390/mm: uninline ptep_xxx functions from pgtable.h")
Cc: stable@vger.kernel.org # v4.6+
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Claudio Imbrenda <imbrenda@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 4 insertions, 3 deletions

diff --git a/arch/s390/mm/pgtable.c b/arch/s390/mm/pgtable.c
index 7a1897c51c54..d56ef26d4681 100644
--- a/arch/s390/mm/pgtable.c
+++ b/arch/s390/mm/pgtable.c
@@ -202,7 +202,7 @@ static inline pgste_t ptep_xchg_start(struct mm_struct *mm,
         return pgste;
 }
 
-static inline void ptep_xchg_commit(struct mm_struct *mm,
+static inline pte_t ptep_xchg_commit(struct mm_struct *mm,
                                     unsigned long addr, pte_t *ptep,
                                     pgste_t pgste, pte_t old, pte_t new)
 {
@@ -220,6 +220,7 @@ static inline void ptep_xchg_commit(struct mm_struct *mm,
         } else {
                 *ptep = new;
         }
+        return old;
 }
 
 pte_t ptep_xchg_direct(struct mm_struct *mm, unsigned long addr,
@@ -231,7 +232,7 @@ pte_t ptep_xchg_direct(struct mm_struct *mm, unsigned long addr,
         preempt_disable();
         pgste = ptep_xchg_start(mm, addr, ptep);
         old = ptep_flush_direct(mm, addr, ptep);
-        ptep_xchg_commit(mm, addr, ptep, pgste, old, new);
+        old = ptep_xchg_commit(mm, addr, ptep, pgste, old, new);
         preempt_enable();
         return old;
 }
@@ -246,7 +247,7 @@ pte_t ptep_xchg_lazy(struct mm_struct *mm, unsigned long addr,
         preempt_disable();
         pgste = ptep_xchg_start(mm, addr, ptep);
         old = ptep_flush_lazy(mm, addr, ptep);
-        ptep_xchg_commit(mm, addr, ptep, pgste, old, new);
+        old = ptep_xchg_commit(mm, addr, ptep, pgste, old, new);
         preempt_enable();
         return old;
 }