Re: [PATCH 0/6] use memcpy_mcsafe() for copy_to_iter()

[Linus Torvalds]

On Tue, May 1, 2018 at 7:26 PM Dan Williams <dan.j.williams@xxxxxxxxx>
wrote:

> Right, but the only way to make MCE non-fatal is to teach the machine
> check handler about recoverable conditions. This patch teaches the
> machine check handler how to recover copy_to_iter() errors.

Why not just unmap the page and remap a new page  in its place? Meaning
that it needs absolutely no special error handling in the callers.

IOW, treat it *exactly*  like the whole page poisoning.

We _have_ the technology. Why does this code think it's such a special
snow-flake?

              Linus