drm/vram: Unexport internal functions of VRAM MM

The init, cleanup and mmap functions of VRAM MM are only used internally.
Remove them from the public interface.

v2:
	* update for debugfs support
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Acked-by: Gerd Hoffmann <kraxel@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190911110910.30698-4-tzimmermann@suse.de

drivers/gpu/drm/drm_gem_vram_helper.c

@@ -889,18 +889,7 @@ int drm_vram_mm_debugfs_init(struct drm_minor *minor)
 }
 EXPORT_SYMBOL(drm_vram_mm_debugfs_init);
 
-/**
- * drm_vram_mm_init() - Initialize an instance of VRAM MM.
- * @vmm:	the VRAM MM instance to initialize
- * @dev:	the DRM device
- * @vram_base:	the base address of the video memory
- * @vram_size:	the size of the video memory in bytes
- *
- * Returns:
- * 0 on success, or
- * a negative error code otherwise.
- */
-int drm_vram_mm_init(struct drm_vram_mm *vmm, struct drm_device *dev,
+static int drm_vram_mm_init(struct drm_vram_mm *vmm, struct drm_device *dev,
 			    uint64_t vram_base, size_t vram_size)
 {
 	int ret;
@@ -921,34 +910,17 @@ int drm_vram_mm_init(struct drm_vram_mm *vmm, struct drm_device *dev,
 
 	return 0;
 }
-EXPORT_SYMBOL(drm_vram_mm_init);
 
-/**
- * drm_vram_mm_cleanup() - Cleans up an initialized instance of VRAM MM.
- * @vmm:	the VRAM MM instance to clean up
- */
-void drm_vram_mm_cleanup(struct drm_vram_mm *vmm)
+static void drm_vram_mm_cleanup(struct drm_vram_mm *vmm)
 {
 	ttm_bo_device_release(&vmm->bdev);
 }
-EXPORT_SYMBOL(drm_vram_mm_cleanup);
 
-/**
- * drm_vram_mm_mmap() - Helper for implementing &struct file_operations.mmap()
- * @filp:	the mapping's file structure
- * @vma:	the mapping's memory area
- * @vmm:	the VRAM MM instance
- *
- * Returns:
- * 0 on success, or
- * a negative error code otherwise.
- */
-int drm_vram_mm_mmap(struct file *filp, struct vm_area_struct *vma,
+static int drm_vram_mm_mmap(struct file *filp, struct vm_area_struct *vma,
 			    struct drm_vram_mm *vmm)
 {
 	return ttm_bo_mmap(filp, vma, &vmm->bdev);
 }
-EXPORT_SYMBOL(drm_vram_mm_mmap);
 
 /*
  * Helpers for integration with struct drm_device

include/drm/drm_gem_vram_helper.h

@@ -171,12 +171,6 @@ static inline struct drm_vram_mm *drm_vram_mm_of_bdev(
 }
 
 int drm_vram_mm_debugfs_init(struct drm_minor *minor);
-int drm_vram_mm_init(struct drm_vram_mm *vmm, struct drm_device *dev,
-		     uint64_t vram_base, size_t vram_size);
-void drm_vram_mm_cleanup(struct drm_vram_mm *vmm);
-
-int drm_vram_mm_mmap(struct file *filp, struct vm_area_struct *vma,
-		     struct drm_vram_mm *vmm);
 
 /*
  * Helpers for integration with struct drm_device