drm_mtrr_del
drm_mtrr_del(0, adev->gmc.aper_base, adev->gmc.aper_size, DRM_MTRR_WC);
drm_mtrr_del(0, adev->gmc.aper_base, adev->gmc.aper_size, DRM_MTRR_WC);
retcode = drm_mtrr_del(0, dev->agp->info.ai_aperture_base,
int drm_mtrr_del(int, unsigned long, size_t, int);
drm_mtrr_del(0, rdev->mc.aper_base, rdev->mc.aper_size, DRM_MTRR_WC);