From: Rafael J. Wysocki Date: Mon, 20 Oct 2008 21:30:19 +0000 (+0000) Subject: x86 ACPI: fix breakage of resume on 64-bit UP systems with SMP kernel X-Git-Tag: v2.6.27.4~23 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=bc79810633524ea09b77e3de3ba3f4a97f2152b7;p=pandora-kernel.git 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 Acked-by: Pavel Machek Signed-off-by: Ingo Molnar Reported-and-tested-by: Andy Wettstein Signed-off-by: Greg Kroah-Hartman --- Reading git-diff-tree failed