Re: [PROBLEM] possible divide by 0 in kernel/sched/cputime.cscale_stime()

[Ingo Molnar]

* Peter Zijlstra <peterz@xxxxxxxxxxxxx> wrote:

> I would be tempted to say you should simply mark the tsc unstable on 
> boot and live with that -- we fully assume the sched_clock stuff is 
> not going backwards in an 'observable' way.

BIOS crap and actual hardware bugs do happen - so kernel code needs to 
consider TSC input with a pinch of salt, assuming that it's untrusted 
external data.

> That said, it might be nice to not crash either..

Indeed, not crashing on weird TSC input is absolutely required!

Thanks,

	Ingo
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