seq_buf_printf
seq_buf_printf(s, "model year: %d", year);
seq_buf_printf(s, "year of manufacture: %d", year);
seq_buf_printf(s, "week/year of manufacture: %d/%d", week, year);
seq_buf_printf(s, "DDI %c/PHY %c",
seq_buf_printf(s, "DDI %s%c/PHY %s%c",
seq_buf_printf(s, "DDI %c%s/PHY %s%c",
seq_buf_printf(s, "DDI %c/PHY %c", port_name(port), phy_name(phy));
seq_buf_printf(s, "%s%d", i ? ", " : "", array[i]);
void seq_buf_printf(struct seq_buf *, const char *, ...);