kref_read
if (kref_read(&ctx->refcount) != 1) {
WARN_ON(kref_read(&dm_new_crtc_state->stream->refcount) > 1);
WARN_ON(kref_read(&dm_new_plane_state->dc_state->refcount) > 1);
kref_read(&obj->refcount));
DRM_DEBUG("OBJ ID: %d (%d)\n", obj->id, kref_read(&obj->refcount));
DRM_DEBUG("OBJ ID: %d (%d)\n", obj->id, kref_read(&obj->refcount));
return kref_read(&fb->base.refcount);
WARN_ON(!kref_read(&bo->kref));
WARN_ON(!kref_read(&bo->kref));
BUG_ON(kref_read(&bo->list_kref));
BUG_ON(kref_read(&bo->kref));