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

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Date:   Mon, 15 Jan 2018 16:32:43 +0100
From:   Ingo Molnar <mingo@...nel.org>
To:     Juergen Gross <jgross@...e.com>
Cc:     Borislav Petkov <bp@...en8.de>,
        Mike Galbraith <mgalbraith@...e.de>,
        LKML <linux-kernel@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Peter Zijlstra <peterz@...radead.org>
Subject: Re: [x86-tip] RSDP changes converted i4790 box SMP -> UP


* Juergen Gross <jgross@...e.com> 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