Public bug reported:
SRU Justification: This patch has been accepted into the upstream 2.6.27.4
stable kernel.
It should be pulled into the Ubuntu kernel as well.
TEST CASE: TBD
commit bc79810633524ea09b77e3de3ba3f4a97f2152b7
Author: Rafael J. Wysocki <[EMAIL PROTECTED]>
Date: Mon Oct 20 21:30:19 2008 +0000
x86 ACPI: fix breakage of resume on 64-bit UP systems with SMP kernel
commit 3038edabf48f01421c621cb77a712b446d3a5d67 upstream
x86 ACPI: Fix breakage of resume on 64-bit UP systems with SMP kernel
We are now using per CPU GDT tables in head_64.S and the original
early_gdt_descr.address is invalidated after boot by
setup_per_cpu_areas(). This breaks resume from suspend to RAM on
x86_64 UP systems using SMP kernels, because this part of head_64.S
is also executed during the resume and the invalid GDT address
causes the system to crash. It doesn't break on 'true' SMP systems,
because early_gdt_descr.address is modified every time
native_cpu_up() runs. However, during resume it should point to the
GDT of the boot CPU rather than to another CPU's GDT.
For this reason, during suspend to RAM always make
early_gdt_descr.address point to the boot CPU's GDT.
This fixes http://bugzilla.kernel.org/show_bug.cgi?id=11568, which
is a regression from 2.6.26.
Signed-off-by: Rafael J. Wysocki <[EMAIL PROTECTED]>
Acked-by: Pavel Machek <[EMAIL PROTECTED]>
Signed-off-by: Ingo Molnar <[EMAIL PROTECTED]>
Reported-and-tested-by: Andy Wettstein <[EMAIL PROTECTED]>
Signed-off-by: Greg Kroah-Hartman <[EMAIL PROTECTED]>
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
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x86 ACPI: fix breakage of resume on 64-bit UP systems with SMP kernel
https://bugs.launchpad.net/bugs/294016
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