drm_fbdev_use_shadow_fb  635 drivers/gpu/drm/drm_fb_helper.c 	if (!drm_fbdev_use_shadow_fb(helper))
drm_fbdev_use_shadow_fb 2233 drivers/gpu/drm/drm_fb_helper.c 	if (drm_fbdev_use_shadow_fb(fb_helper)) {