1 files changed, 6 insertions, 0 deletions

diff --git a/mm/nommu.c b/mm/nommu.c
index ba6df4d29979..cbbc13774819 100644
--- a/mm/nommu.c
+++ b/mm/nommu.c
@@ -826,6 +826,11 @@ unsigned long do_mmap_pgoff(struct file *file,
                 unsigned long pglen = (len + PAGE_SIZE - 1) >> PAGE_SHIFT;
                 unsigned long vmpglen;
 
+                /* suppress VMA sharing for shared regions */
+                if (vm_flags & VM_SHARED &&
+                    capabilities & BDI_CAP_MAP_DIRECT)
+                        goto dont_share_VMAs;
+
                 for (rb = rb_first(&nommu_vma_tree); rb; rb = rb_next(rb)) {
                         vma = rb_entry(rb, struct vm_area_struct, vm_rb);
 
@@ -859,6 +864,7 @@ unsigned long do_mmap_pgoff(struct file *file,
                         goto shared;
                 }
 
+        dont_share_VMAs:
                 vma = NULL;
 
                 /* obtain the address at which to make a shared mapping