@fatboy
What do you mean by production? Who would do it? Here's a company that wants to, as soon as feasible:
https://puri.sm/posts/meltdown-spectre-and-the-future-of-secure-hardware/
(see last paragraph)
For them, not even ARM is good enough. Too proprietary.

@danielst I mean, every single factor that needs to be in place before the CPU is in a laptop running Linux.

@fatboy
Like... designing a mainboard and case, sourcing the parts and have them assembled?
That's what Purism did for their phone, and they even intend to release the schematics (as their ultimate goal is 100% open hardware).

@danielst I mean, is there a company that makes RISC-V CPUs?
Is there motherboards available for these CPUs?
What's the production capacity of these manufacturers?
Have these CPUs been benchmarked and QC'd for reliability and performance?
Where can these PC/laptops be bought?

@fatboy
I think you're a bit early =)
I don't expect such a machine before 2021. If it's Purism, they'd design their own mainboard and either contract the manufacturing (basically unlimited capacity), or move it to their new own US based facility.
As for the CPU, i think SiFive is the your best bet as of now:
https://www.sifive.com/boards/hifive-unleashed

@fatboy
If you're curious, here you can indulge in the schematics of the Librem 5 dev board:
https://source.puri.sm/Librem5/dvk-mx8m-bsb/blob/master/dvk-mx8m-bsb.pdf