1 files changed, 5 insertions, 4 deletions

diff --git a/mm/mprotect.c b/mm/mprotect.c
index 360d9cc8b38c..fded06f923f4 100644
--- a/mm/mprotect.c
+++ b/mm/mprotect.c
@@ -21,6 +21,7 @@
 #include <linux/syscalls.h>
 #include <linux/swap.h>
 #include <linux/swapops.h>
+#include <linux/mmu_notifier.h>
 #include <asm/uaccess.h>
 #include <asm/pgtable.h>
 #include <asm/cacheflush.h>
@@ -153,12 +154,10 @@ mprotect_fixup(struct vm_area_struct *vma, struct vm_area_struct **pprev,
          * If we make a private mapping writable we increase our commit;
          * but (without finer accounting) cannot reduce our commit if we
          * make it unwritable again.
-         *
-         * FIXME? We haven't defined a VM_NORESERVE flag, so mprotecting
-         * a MAP_NORESERVE private mapping to writable will now reserve.
          */
         if (newflags & VM_WRITE) {
-                if (!(oldflags & (VM_ACCOUNT|VM_WRITE|VM_SHARED))) {
+                if (!(oldflags & (VM_ACCOUNT|VM_WRITE|
+                                                VM_SHARED|VM_NORESERVE))) {
                         charged = nrpages;
                         if (security_vm_enough_memory(charged))
                                 return -ENOMEM;
@@ -205,10 +204,12 @@ success:
                 dirty_accountable = 1;
         }
 
+        mmu_notifier_invalidate_range_start(mm, start, end);
         if (is_vm_hugetlb_page(vma))
                 hugetlb_change_protection(vma, start, end, vma->vm_page_prot);
         else
                 change_protection(vma, start, end, vma->vm_page_prot, dirty_accountable);
+        mmu_notifier_invalidate_range_end(mm, start, end);
         vm_stat_account(mm, oldflags, vma->vm_file, -nrpages);
         vm_stat_account(mm, newflags, vma->vm_file, nrpages);
         return 0;