Extern or forward variable declaration at include/drm/drm_drv.h, line 40 References: drivers/gpu/drm/drm_gem_cma_helper.c, line 439 drivers/gpu/drm/drm_gem_cma_helper.c, line 555 drivers/gpu/drm/drm_gem_shmem_helper.c, line 741 drivers/gpu/drm/drm_mipi_dbi.c, line 205 drivers/gpu/drm/drm_prime.c, line 575 drivers/gpu/drm/drm_prime.c, line 593 drivers/gpu/drm/drm_prime.c, line 613 drivers/gpu/drm/drm_prime.c, line 650 drivers/gpu/drm/drm_prime.c, line 909 drivers/gpu/drm/drm_prime.c, line 1046 drivers/gpu/drm/gud/gud_pipe.c, line 140 drivers/gpu/drm/nouveau/nouveau_gem.h, line 39 drivers/gpu/drm/nouveau/nouveau_prime.c, line 39 drivers/gpu/drm/pl111/pl111_drv.c, line 198 drivers/gpu/drm/tegra/gem.c, line 405 drivers/gpu/drm/tegra/gem.c, line 561 drivers/gpu/drm/tegra/gem.c, line 593 drivers/gpu/drm/tiny/repaper.c, line 535 drivers/gpu/drm/tiny/st7586.c, line 95 drivers/gpu/drm/vgem/vgem_drv.c, line 340 drivers/gpu/drm/virtio/virtgpu_drv.h, line 449 drivers/gpu/drm/virtio/virtgpu_prime.c, line 140 include/drm/drm_drv.h, line 40 include/drm/drm_drv.h, line 380