[PATCH] mm/autonuma: Don't mark pte saved write in case of dirty_accountable.

[PATCH] mm/autonuma: Don't mark pte saved write in case of dirty_accountable.

[Aneesh Kumar K.V]

We never request for protection update with ditry_accountable set and prot_numa
set. Hence mark the pte with mkwrite instead mk_savedwrite.

Found this when running stress-ng test with debug check enabled. This trigger
the VM_BUG_ON in pte_mk_savedwrite()

Fixes: http://ozlabs.org/~akpm/mmots/broken-out/mm-autonuma-let-architecture-override-how-the-write-bit-should-be-stashed-in-a-protnone-pte.patch

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
---
 mm/mprotect.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/mprotect.c b/mm/mprotect.c
index 15f5c174a7c1..bccccc73080d 100644
--- a/mm/mprotect.c
+++ b/mm/mprotect.c
@@ -119,7 +119,7 @@ static unsigned long change_pte_range(struct vm_area_struct *vma, pmd_t *pmd,
 			if (dirty_accountable && pte_dirty(ptent) &&
 					(pte_soft_dirty(ptent) ||
 					 !(vma->vm_flags & VM_SOFTDIRTY))) {
-				ptent = pte_mk_savedwrite(ptent);
+				ptent = pte_mkwrite(ptent);
 			}
 			ptep_modify_prot_commit(mm, addr, pte, ptent);
 			pages++;
-- 
2.7.4

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