1 files changed, 18 insertions, 3 deletions

diff --git a/kernel/fork.c b/kernel/fork.c
index 9440d61b925c..0e23deb5acfc 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -303,11 +303,26 @@ struct kmem_cache *files_cachep;
 struct kmem_cache *fs_cachep;
 
 /* SLAB cache for vm_area_struct structures */
-struct kmem_cache *vm_area_cachep;
+static struct kmem_cache *vm_area_cachep;
 
 /* SLAB cache for mm_struct structures (tsk->mm) */
 static struct kmem_cache *mm_cachep;
 
+struct vm_area_struct *vm_area_alloc(void)
+{
+        return kmem_cache_zalloc(vm_area_cachep, GFP_KERNEL);
+}
+
+struct vm_area_struct *vm_area_dup(struct vm_area_struct *orig)
+{
+        return kmem_cache_alloc(vm_area_cachep, GFP_KERNEL);
+}
+
+void vm_area_free(struct vm_area_struct *vma)
+{
+        kmem_cache_free(vm_area_cachep, vma);
+}
+
 static void account_kernel_stack(struct task_struct *tsk, int account)
 {
         void *stack = task_stack_page(tsk);
@@ -455,7 +470,7 @@ static __latent_entropy int dup_mmap(struct mm_struct *mm,
                                 goto fail_nomem;
                         charge = len;
                 }
-                tmp = kmem_cache_alloc(vm_area_cachep, GFP_KERNEL);
+                tmp = vm_area_dup(mpnt);
                 if (!tmp)
                         goto fail_nomem;
                 *tmp = *mpnt;
@@ -539,7 +554,7 @@ fail_uprobe_end:
 fail_nomem_anon_vma_fork:
         mpol_put(vma_policy(tmp));
 fail_nomem_policy:
-        kmem_cache_free(vm_area_cachep, tmp);
+        vm_area_free(tmp);
 fail_nomem:
         retval = -ENOMEM;
         vm_unacct_memory(charge);