Re: [PATCH] x86: only use ERMS for user copies for larger sizes

[Linus Torvalds]

On Wed, Nov 21, 2018 at 10:26 AM Andy Lutomirski <luto@xxxxxxxxxxxxxx> wrote:
>
> Can we maybe use this as an excuse to ask for some reasonable instructions to access user memory?

I did that long ago. It's why we have CLAC/STAC today. I was told that
what I actually asked for (get an instruction to access user space - I
suggested using a segment override prefix) was not viable.

                 Linus