MIPS_CONF5_MI
config5 &= ~MIPS_CONF5_MI;
config5 |= MIPS_CONF5_MI;
config5 &= ~MIPS_CONF5_MI;
if (config5 & MIPS_CONF5_MI)
WARN_ON(!!cpu_has_mmid != !!(config5 & MIPS_CONF5_MI));