Re: [PATCH 09/31] x86/entry/32: Leave the kernel via trampoline stack

[Linus Torvalds]

On Fri, Feb 9, 2018 at 1:25 AM, Joerg Roedel <joro@xxxxxxxxxx> wrote:
> +
> +       /* Copy over the stack-frame */
> +       cld
> +       rep movsb

Ugh. This is going to be horrendous. Maybe not noticeable on modern
CPU's, but the whole 32-bit code is kind of pointless on a modern CPU.

At least use "rep movsl". If the kernel stack isn't 4-byte aligned,
you have issues.

             Linus