Had been using this quite some time ago, it is sad that it has only 1-CPU support, preventing some SMP bugs from emerging. Wonder if it's hard to make it SMP,

Had been using this quite some time ago, it is sad that it has only 1-CPU support, preventing some SMP bugs from emerging. Wonder if it's hard to make it SMP, if too many places use something like #ifdef CONFIG_ARCH_IS_UM to tell whether it is single CPU, it might be hard.