Re: [RFC PATCH v2 1/3] arm64: add CPU prefetch and cache modulation sysfs interface

[Koba Ko]

Hi Breno,

Thanks for explaining the rebase, rollout and debugging costs of carrying
this out of tree. That's useful context from someone using the patchset.

CONFIG_EXPERT plus tainting on use could make experimental use more
explicit. Those safeguards alone would not establish that firmware
access, virtualization and runtime register updates are handled safely;
the local restrictions still need validation against the hardware and
firmware requirements.

I'd like to hear Will's view on whether this opt-in approach could be
acceptable in principle, and what requirements it would need to meet.
I'm not planning to submit v3.

Thanks,
Koba