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SubjectRe: [PATCH 09/31] x86/entry/32: Leave the kernel via trampoline stack
On Fri, Feb 9, 2018 at 1:25 AM, Joerg Roedel <joro@8bytes.org> 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

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