KiFlushAffinity

volatile _KAFFINITY_EX *__fastcall KiFlushAffinity(INT64 a1){
  void *retaddr; 
  if( (_DWORD)a1 )
    return 0i64;
  _InterlockedOr((volatile signed __int32 *)&retaddr, 0);
  return(volatile _KAFFINITY_EX *)(*((_QWORD *)KeGetCurrentThread() + 23) + 368i64);
}

Referenced by:

KeFlushMultipleRangeTb
KeFlushTb