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-rw-r--r--mm/mmap.c10
1 files changed, 4 insertions, 6 deletions
diff --git a/mm/mmap.c b/mm/mmap.c
index d799d896d74a..8507ee9cd573 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -1105,12 +1105,6 @@ munmap_back:
goto free_vma;
}
- /* Don't make the VMA automatically writable if it's shared, but the
- * backer wishes to know when pages are first written to */
- if (vma->vm_ops && vma->vm_ops->page_mkwrite)
- vma->vm_page_prot =
- protection_map[vm_flags & (VM_READ|VM_WRITE|VM_EXEC)];
-
/* We set VM_ACCOUNT in a shared mapping's vm_flags, to inform
* shmem_zero_setup (perhaps called through /dev/zero's ->mmap)
* that memory reservation must be checked; but that reservation
@@ -1128,6 +1122,10 @@ munmap_back:
pgoff = vma->vm_pgoff;
vm_flags = vma->vm_flags;
+ if (vma_wants_writenotify(vma))
+ vma->vm_page_prot =
+ protection_map[vm_flags & (VM_READ|VM_WRITE|VM_EXEC)];
+
if (!file || !vma_merge(mm, prev, addr, vma->vm_end,
vma->vm_flags, NULL, file, pgoff, vma_policy(vma))) {
file = vma->vm_file;