INTEL_PT_NO_CTX
err = test_ctx_unchanged(d, &packet, INTEL_PT_NO_CTX);
if (decoder->prev_pkt_ctx == INTEL_PT_NO_CTX) {
enum intel_pt_pkt_ctx ctx = INTEL_PT_NO_CTX;
case INTEL_PT_NO_CTX:
*ctx = INTEL_PT_NO_CTX;
enum intel_pt_pkt_ctx ctx = INTEL_PT_NO_CTX;