I think you misunderstand me. With "machine bootup" I meant the hardware, I didn't mean that the kernel does a regular bootup.
The topic was returning from the kexec kernel, and I said it's not needed. Maybe you're right that doing a kexec is needed to cleanly restore the old kernel state, as doing it from the first kernel loaded is too ugly, but I still don't see any reason why there's a need to return from the kexeced kernel back to the original one. Why not just kexec to the restored, original kernel? (No matter to which point exactly.)
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