1 files changed, 1 insertions, 1 deletions

diff --git a/kernel/fork.c b/kernel/fork.c
index fa9124322cd4..1380d8ace334 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -429,7 +429,7 @@ static int dup_mmap(struct mm_struct *mm, struct mm_struct *oldmm)
                                 atomic_dec(&inode->i_writecount);
                         mutex_lock(&mapping->i_mmap_mutex);
                         if (tmp->vm_flags & VM_SHARED)
-                                mapping->i_mmap_writable++;
+                                atomic_inc(&mapping->i_mmap_writable);
                         flush_dcache_mmap_lock(mapping);
                         /* insert tmp into the share list, just after mpnt */
                         if (unlikely(tmp->vm_flags & VM_NONLINEAR))