Re: [PATCH -next for tip:x86/pti] x86/tlb: drop unneeded local vars in enable_l1d_flush_for_task()

[Peter Zijlstra]

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On Thu, Oct 01, 2020 at 09:49:30AM +1000, Singh, Balbir wrote:

> So this is the change I am playing with, I don't like the idea of
> killing the task, but it's better than silently not flushing, I guess
> system administrators will learn with time not to correctly the
> affinity of tasks flushing L1D. For the affinity bits, not being able
> to change the affinity is better, but not being able to provide
> feedback on as to why is a bit weird as well, but I wonder if there
> are other cases where we might want to lock the affinity of a task for
> it's lifetime.

You can't really do that, hot-unplug can (and will) destroy any affinity
setting, and if the task/admin wants to recover it needs to be able to
re-set affinity after that.