drm: Merge CONFIG_DRM_VM into CONFIG_DRM_LEGACY

CONFIG_DRM_VM gets selected by CONFIG_DRM_LEGACY, but nothing else. So
remove it and build drm_vm.o as part of CONFIG_DRM_LEGACY.
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20210112081035.6882-5-tzimmermann@suse.de

drivers/gpu/drm/Kconfig

@@ -214,10 +214,6 @@ config DRM_GEM_SHMEM_HELPER
 	help
 	  Choose this if you need the GEM shmem helper functions
 
-config DRM_VM
-	bool
-	depends on DRM && MMU
-
 config DRM_SCHED
 	tristate
 	depends on DRM
@@ -391,7 +387,6 @@ source "drivers/gpu/drm/xlnx/Kconfig"
 menuconfig DRM_LEGACY
 	bool "Enable legacy drivers (DANGEROUS)"
 	depends on DRM && MMU
-	select DRM_VM
 	help
 	  Enable legacy DRI1 drivers. Those drivers expose unsafe and dangerous
 	  APIs to user-space, which can be used to circumvent access

drivers/gpu/drm/Makefile

@@ -21,9 +21,8 @@ drm-y       :=	drm_auth.o drm_cache.o \
 		drm_managed.o drm_vblank_work.o
 
 drm-$(CONFIG_DRM_LEGACY) += drm_bufs.o drm_context.o drm_dma.o drm_legacy_misc.o drm_lock.o \
-		drm_memory.o drm_scatter.o
+		drm_memory.o drm_scatter.o drm_vm.o
 drm-$(CONFIG_DRM_LIB_RANDOM) += lib/drm_random.o
-drm-$(CONFIG_DRM_VM) += drm_vm.o
 drm-$(CONFIG_COMPAT) += drm_ioc32.o
 drm-$(CONFIG_DRM_GEM_CMA_HELPER) += drm_gem_cma_helper.o
 drm-$(CONFIG_DRM_GEM_SHMEM_HELPER) += drm_gem_shmem_helper.o

drivers/gpu/drm/drm_legacy.h

@@ -127,7 +127,7 @@ static inline void drm_legacy_master_rmmaps(struct drm_device *dev,
 static inline void drm_legacy_rmmaps(struct drm_device *dev) {}
 #endif
 
-#if IS_ENABLED(CONFIG_DRM_VM) && IS_ENABLED(CONFIG_DRM_LEGACY)
+#if IS_ENABLED(CONFIG_DRM_LEGACY)
 void drm_legacy_vma_flush(struct drm_device *d);
 #else
 static inline void drm_legacy_vma_flush(struct drm_device *d)