drm_wait_vblank32_t
#define DRM_IOCTL_WAIT_VBLANK32 DRM_IOWR(0x3a, drm_wait_vblank32_t)
req32to64(union drm_wait_vblank *req64, const drm_wait_vblank32_t *req32)
req64to32(drm_wait_vblank32_t *req32, const union drm_wait_vblank *req64)
drm_wait_vblank32_t req32;