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Re: comment and new question--when do upgrades take effect

On 01/29/2018 08:15 AM, Andy Smith wrote:

The dangerous effects of Meltdown are avoided in Linux by use of the
KPTI feature which is now in Debian's supported kernels.

I've seen comments such as that before.
But I've not seen anything about "What is KPTI or how to use it".