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

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Date:   Fri, 12 Jan 2018 07:40:17 +0100
From:   Juergen Gross <jgross@...e.com>
To:     Mike Galbraith <mgalbraith@...e.de>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>
Subject: Re: [x86-tip] RSDP changes converted i4790 box SMP -> UP

On 12/01/18 05:25, Mike Galbraith wrote:
> Hi Juergen,
> 
> Yesterday I wanted to test the RETPOLINE stuff in tip and tip-rt, but
> discovered instead that my box had turned into a complete slug, not due
> to incredible RETPOLINE overhead, rather because box had forgotten that
> it had more than one CPU.  I was going to leave it for the weekend, but
> firing up gitk over morning java, I noticed the commits below, and sure
> enough, that's what broke my box.  Given other people's boxen work,
> seems likely that the authors of the AMI BIOS in this box were a bit
> more creative than usual.

So I'm curious how this should be possible.

Some questions:

- which bootloader are you using?
- what does /sys/kernel/boot_params/version contain?
- can you print the returned value of acpi_arch_get_root_pointer()
  in acpi_os_get_root_pointer() with the patches applied and report
  it, please?

Juergen