Reboot implemention

[Cathey, Jim]

>Is there a reason why BusyBox's [reboot] implementation is different, or is it a bug?
None of the above?  A sync(2) call, wherever found, is not the be-all and end-all of filesystem cleanup.  It just gets the fs cache-cleaning party started.  More than one is just fine, even zero is fine.  It's mostly just trying to help provide data-loss insurance against an unlikely kernel crash during the shutdown phase.  The final fs cleanup, and the only one that really counts, is what the kernel does after init(8) exits.

-- Jim

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