mm, dax: VMA with vm_ops->pfn_mkwrite wants to be write-notified

[pandora-kernel.git] / mm / mmap.c

diff --git a/mm/mmap.c b/mm/mmap.c
index c739d6d..79bcc9f 100644 (file)
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -1490,13 +1490,14 @@ SYSCALL_DEFINE1(old_mmap, struct mmap_arg_struct __user *, arg)
 int vma_wants_writenotify(struct vm_area_struct *vma)
 {
        vm_flags_t vm_flags = vma->vm_flags;
+       const struct vm_operations_struct *vm_ops = vma->vm_ops;
 
        /* If it was private or non-writable, the write bit is already clear */
        if ((vm_flags & (VM_WRITE|VM_SHARED)) != ((VM_WRITE|VM_SHARED)))
                return 0;
 
        /* The backer wishes to know when pages are first written to? */
-       if (vma->vm_ops && vma->vm_ops->page_mkwrite)
+       if (vm_ops && (vm_ops->page_mkwrite || vm_ops->pfn_mkwrite))
                return 1;
 
        /* The open routine did something to the protections that pgprot_modify