Re: [x86-tip] RSDP changes converted i4790 box SMP -> UP

[Ingo Molnar]

* Juergen Gross <jgross@xxxxxxxx> wrote:

> On 15/01/18 15:56, Borislav Petkov wrote:
> > On Mon, Jan 15, 2018 at 03:52:25PM +0100, Juergen Gross wrote:
> >> Ingo, with my finding that above boot failure is related to a bug in
> >> openSUSE's grub2 (I've verified it soesn't exist in upstream grub2),
> > 
> > The box I'm seeing this on has SLES12-SP2 grub:
> > 
> > Version        : 2.02~beta2-115.9.1
> > 
> > Does it have the same bug?
> 
> The patch introducing this problem is from 2012. So I guess: yes.

I suspect this makes it a widespread, unintended ABI. Can we detect and somehow avoid it?

The boot protocol ABI sucks if it's fragile against such mistakes.

Thanks,

	Ingo