Earlier quoted context omitted.
No one seems to have told the other BSDs, either.
FreeBSD was told in December, which is still a realistic timeline.
* https://news.ycombinator.com/item?id=16074531
That is hardly enough time, considering that it is likely a holiday period for most of the people concerned, to prepare what needed to be prepared. Google and Intel gave themselves six months, in contrast, and they gave Ubuntu since November 2017.
I still haven't nailed down how much advanced notice Matthew Dillion, author of DragonFly BSD, was given; although his apparent level of preparedness with patches on 2018-01-05 can be attributed to the fact that he actually talked publicly about the problem in April 2017, months before Google Project Zero secretly reported it to processor manufacturers in June 2017 in the first place.