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Diffstat (limited to 'kernel/fork.c')
-rw-r--r--kernel/fork.c35
1 files changed, 30 insertions, 5 deletions
diff --git a/kernel/fork.c b/kernel/fork.c
index 9440d61b925c..a191c05e757d 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -303,11 +303,38 @@ 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(struct mm_struct *mm)
+{
+ struct vm_area_struct *vma = kmem_cache_zalloc(vm_area_cachep, GFP_KERNEL);
+
+ if (vma) {
+ vma->vm_mm = mm;
+ INIT_LIST_HEAD(&vma->anon_vma_chain);
+ }
+ return vma;
+}
+
+struct vm_area_struct *vm_area_dup(struct vm_area_struct *orig)
+{
+ struct vm_area_struct *new = kmem_cache_alloc(vm_area_cachep, GFP_KERNEL);
+
+ if (new) {
+ *new = *orig;
+ INIT_LIST_HEAD(&new->anon_vma_chain);
+ }
+ return new;
+}
+
+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);
@@ -455,11 +482,9 @@ 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;
- INIT_LIST_HEAD(&tmp->anon_vma_chain);
retval = vma_dup_policy(mpnt, tmp);
if (retval)
goto fail_nomem_policy;
@@ -539,7 +564,7 @@ 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);