drm: Make drm_vm_open/close_locked private to drm_vm.c

It's only used for legacy mmaping support now.
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1461691808-12414-8-git-send-email-daniel.vetter@ffwll.ch

drivers/gpu/drm/drm_internal.h

@@ -37,8 +37,6 @@ int drm_irq_by_busid(struct drm_device *dev, void *data,
 
 /* drm_vm.c */
 int drm_vma_info(struct seq_file *m, void *data);
-void drm_vm_open_locked(struct drm_device *dev, struct vm_area_struct *vma);
-void drm_vm_close_locked(struct drm_device *dev, struct vm_area_struct *vma);
 
 /* drm_prime.c */
 int drm_prime_handle_to_fd_ioctl(struct drm_device *dev, void *data,

drivers/gpu/drm/drm_vm.c

@@ -395,15 +395,7 @@ static const struct vm_operations_struct drm_vm_sg_ops = {
 	.close = drm_vm_close,
 };
 
-/**
- * \c open method for shared virtual memory.
- *
- * \param vma virtual memory area.
- *
- * Create a new drm_vma_entry structure as the \p vma private data entry and
- * add it to drm_device::vmalist.
- */
-void drm_vm_open_locked(struct drm_device *dev,
+static void drm_vm_open_locked(struct drm_device *dev,
 			       struct vm_area_struct *vma)
 {
 	struct drm_vma_entry *vma_entry;
@@ -429,7 +421,7 @@ static void drm_vm_open(struct vm_area_struct *vma)
 	mutex_unlock(&dev->struct_mutex);
 }
 
-void drm_vm_close_locked(struct drm_device *dev,
+static void drm_vm_close_locked(struct drm_device *dev,
 				struct vm_area_struct *vma)
 {
 	struct drm_vma_entry *pt, *temp;