Re: S3 sleep no longer works on x86_64 in 2.6.27

["Rafael J. Wysocki" <rjw@sisk.pl>]

On Friday, 24 of October 2008, H. Peter Anvin wrote:
> Ingo Molnar wrote:
> > * Gleb Natapov <gleb@redhat.com> wrote:
> > 
> >> Hi,
> >>
> >> S3 sleep no longer works on x86_64 (at least in KVM, but it looks like 
> >> this is the kernel bug). Kernel 2.6.26 works. I think that the commit 
> >> that caused the problem is a939098af, but I can't be 100% sure since 
> >> compilation is broken at this point.
> >>
> >> Triple fault happens during S3 resume. It happens in 
> >> arch/x86/kernel/head_64.S during access to GDT after it was loaded on 
> >> line 213 (lgdt early_gdt_descr(%rip)) early_gdt_descr points to 
> >> per_cpu__gdt_page and this address contains valid GDT entries during a 
> >> regular boot, but on S3 resume in contains garbage. It seems that 
> >> per_cpu area is reallocated somewhere, but I don't understand this 
> >> magic enough to fix it. Can somebody look at this and explain what 
> >> happens?
> > 
> > could you check whether the (post-v2.6.27) upstream fix below does the 
> > trick for you?
> > 
> > 	Ingo
> > 
> > From 3038edabf48f01421c621cb77a712b446d3a5d67 Mon Sep 17 00:00:00 2001
> > From: Rafael J. Wysocki <rjw@sisk.pl>
> > Date: Fri, 17 Oct 2008 01:26:27 +0200
> > Subject: [PATCH] x86 ACPI: fix breakage of resume on 64-bit UP systems with SMP kernel
> > 
> > x86 ACPI: Fix breakage of resume on 64-bit UP systems with SMP kernel
> > 
> 
> Is this patch scheduled for 2.6.27-stable?  If not, it sounds like it 
> should be.

It is. :-)

Thanks,
Rafael