[patch 03/27] x86 ACPI: fix breakage of resume on 64-bit UPsystems with SMP kernel

[Greg KH]

2.6.27-stable review patch.  If anyone has any objections, please let us 
know.

------------------
From: Rafael J. Wysocki <rjw@xxxxxxx>

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 <rjw@xxxxxxx>
Acked-by: Pavel Machek <pavel@xxxxxxx>
Signed-off-by: Ingo Molnar <mingo@xxxxxxx>
Reported-and-tested-by: Andy Wettstein <ajw1980@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>

---
 arch/x86/kernel/acpi/sleep.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/arch/x86/kernel/acpi/sleep.c
+++ b/arch/x86/kernel/acpi/sleep.c
@@ -10,6 +10,7 @@
 #include <linux/dmi.h>
 #include <linux/cpumask.h>
 #include <asm/segment.h>
+#include <asm/desc.h>
 
 #include "realmode/wakeup.h"
 #include "sleep.h"
@@ -98,6 +99,8 @@ int acpi_save_state_mem(void)
 	header->trampoline_segment = setup_trampoline() >> 4;
 #ifdef CONFIG_SMP
 	stack_start.sp = temp_stack + 4096;
+	early_gdt_descr.address =
+			(unsigned long)get_cpu_gdt_table(smp_processor_id());
 #endif
 	initial_code = (unsigned long)wakeup_long64;
 	saved_magic = 0x123456789abcdef0;

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