Re: [PATCH v4 06/27] x86/doublefault: Remove memmove() call

[Andy Lutomirski]

On Fri, Feb 21, 2020 at 5:50 AM Peter Zijlstra <peterz@xxxxxxxxxxxxx> wrote:
>
> Use of memmove() in #DF is problematic when you consider tracing and
> other instrumentation.
>
> Remove the memmove() call and simply write out what need doing; Boris
> argues the ranges should not overlap.
>
> Survives selftests/x86, specifically sigreturn_64.
>
> (Andy ?!)

Acked-by: Andy Lutomirski <luto@xxxxxxxxxx>

Even ignoring the tracing issue, I think this is nicer than the original code.