Re: [RFC v2 PATCH 7/7] x86/entry: use int for syscall number; handle all invalid syscall nrs

[H. Peter Anvin]

On 5/12/21 11:34 AM, Thomas Gleixner wrote:
> > That is intentional, as (again) system calls are int.
>
> They are 'int' kernel internally, but _NOT_ at the user space visible
> side. Again: man syscall
>
>      syscall(long number,...);
>
> So that results in a user ABI change.
>
> > As stated in my reply to Ingo, I'll clean the various descriptions and
> > try to capture the discussion better.
>
> If we agree to go there then this wants to be a seperate commit which
> does nothing else than changing this behaviour.

Good idea.

As far as this being a user ABI change, this is actually a revert to the 
original x86-64 ABI; see my message to Ingo.

	-hpa