diff options
Diffstat (limited to 'mm/nommu.c')
| -rw-r--r-- | mm/nommu.c | 6 |
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 |