dce_v8_0_latency_watermark
latency_watermark_a = min_t(u32, dce_v8_0_latency_watermark(&wm_high), 65535);
latency_watermark_b = min_t(u32, dce_v8_0_latency_watermark(&wm_low), 65535);
if (dce_v8_0_latency_watermark(wm) <= latency_hiding)