Messages in this thread | | | Subject | Re: [x86-tip] RSDP changes converted i4790 box SMP -> UP | From | Mike Galbraith <> | Date | Mon, 15 Jan 2018 16:08:50 +0100 |
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On Mon, 2018-01-15 at 15:41 +0100, Juergen Gross wrote: > 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 > > And this is the problem. > > grub2 of opensuse 42.3 is _wrong_. > > It copies the setup_header in the size it knows of (last fiels is > handover_offset), fills in some stuff, and then copies back 1024 bytes. > So grub2 of openSUSE 42.3 is _not_ ready to accept extensions of > bootparams. > > This is a major breakage of the protocol, I think.
Oh joy, userspace b0rkage. Kernel b0rkage is a lot less annoying.
Hohum, I have zero problem with carrying a revert until grub2 gets fixed up, but lord knows how many others out there may bisect, and bless your mailbox with the fruit of their labors :)
-Mike
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