CPUDEAD_MWAIT_KEXEC_HLT
if (READ_ONCE(md->control) == CPUDEAD_MWAIT_KEXEC_HLT) {
WRITE_ONCE(md->status, CPUDEAD_MWAIT_KEXEC_HLT);
u32 newstate = CPUDEAD_MWAIT_KEXEC_HLT;