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

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Date:   Fri, 12 Jan 2018 12:17:43 +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 09:01, Mike Galbraith wrote:
> On Fri, 2018-01-12 at 07:40 +0100, Juergen Gross wrote:
>> 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.
> 
> Box is absolutely certain that it is.
> 
>> Some questions:
>>
>> - which bootloader are you using?
> 
> grub2, box is bog standard opensuse-42.3
> 
>> - what does /sys/kernel/boot_params/version contain?
> 
> 0x020e

Hmm, what does:

cat /sys/kernel/boot_params/data | od -t x1 -A x | grep -e ^0002

report? Please do that with 0c89cf36424f7c1177de8a5712514d7cc2eb369f
reverted and with 2f74cbf947f45fa082dda8eac1a1f1299a372f49 applied.


Juergen