On Friday, 1 of February 2008, Ingo Molnar wrote:
quoted text
> 
> * Rafael J. Wysocki <rjw@sisk.pl> wrote:
> 
> > >  arch/x86/kernel/built-in.o: In function `wakeup_start':
> > >  : undefined reference to `swsusp_pg_dir'
> > > 
> > > config attached.
> > 
> > I see.  CONFIG_HIBERNATION && CONFIG_ACPI -> CONFIG_ACPI_SLEEP and the 
> > Makefile in arch/x86/kernel/acpi/ wants to build wakeup.S, which is 
> > not necessary.  Hmm.
> > 
> > We can do a couple of things:
> > (1) make wakeup_$(BITS).o depend on CONFIG_SUSPEND (alone)
> >     This will build it if CONFIG_SUSPEND is set, but CONFIG_ACPI is not
> >     (still, that's consistent with the change in question).
> > (2) make wakeup_$(BITS).o depend on CONFIG_SUSPEND and CONFIG_ACPI
> > (3) define CONFIG_ACPI_SUSPEND depending on ACPI and SUSPEND and
> >     make wakeup_$(BITS).o as well as swsusp_pg_dir depend on that (most
> >     elegant)
> > 
> > Which one do you prefer?
> 
> no strong preference here - pick the one you like best and send a patch 
> please :-)

Here you go, but I think it falls into the ACPI category.

---
From: Rafael J. Wysocki <rjw@sisk.pl>

Since hibernation uses its own temporary page tables for restoring
the image kernel, swsusp_pg_dir is only needed for ACPI resume from
RAM.  Also, some files under arch/x86/kernel/acpi need only be compiled
if ACPI suspend to RAM is going to be used.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
---
 arch/x86/kernel/acpi/Makefile |    2 +-
 arch/x86/mm/init_32.c         |   10 +++++-----
 drivers/acpi/Kconfig          |    5 +++++
 3 files changed, 11 insertions(+), 6 deletions(-)

Index: linux-2.6/arch/x86/mm/init_32.c
===================================================================
--- linux-2.6.orig/arch/x86/mm/init_32.c
+++ linux-2.6/arch/x86/mm/init_32.c
@@ -423,23 +423,23 @@ static void __init pagetable_init(void)
 	paravirt_pagetable_setup_done(pgd_base);
 }
 
-#if defined(CONFIG_HIBERNATION) || defined(CONFIG_ACPI)
+#ifdef CONFIG_ACPI_SUSPEND
 /*
- * Swap suspend & friends need this for resume because things like the intel-agp
+ * ACPI suspend needs this for resume, because things like the intel-agp
  * driver might have split up a kernel 4MB mapping.
  */
-char __nosavedata swsusp_pg_dir[PAGE_SIZE]
+char swsusp_pg_dir[PAGE_SIZE]
 	__attribute__ ((aligned(PAGE_SIZE)));
 
 static inline void save_pg_dir(void)
 {
 	memcpy(swsusp_pg_dir, swapper_pg_dir, PAGE_SIZE);
 }
-#else
+#else /* !CONFIG_ACPI_SUSPEND */
 static inline void save_pg_dir(void)
 {
 }
-#endif
+#endif /* !CONFIG_ACPI_SUSPEND */
 
 void zap_low_mappings(void)
 {
Index: linux-2.6/drivers/acpi/Kconfig
===================================================================
--- linux-2.6.orig/drivers/acpi/Kconfig
+++ linux-2.6/drivers/acpi/Kconfig
@@ -42,6 +42,11 @@ menuconfig ACPI
 
 if ACPI
 
+config ACPI_SUSPEND
+	bool
+	depends on SUSPEND
+	default y
+
 config ACPI_SLEEP
 	bool
 	depends on PM_SLEEP
Index: linux-2.6/arch/x86/kernel/acpi/Makefile
===================================================================
--- linux-2.6.orig/arch/x86/kernel/acpi/Makefile
+++ linux-2.6/arch/x86/kernel/acpi/Makefile
@@ -1,5 +1,5 @@
 obj-$(CONFIG_ACPI)		+= boot.o
-obj-$(CONFIG_ACPI_SLEEP)	+= sleep.o wakeup_$(BITS).o
+obj-$(CONFIG_ACPI_SUSPEND)	+= sleep.o wakeup_$(BITS).o
 
 ifneq ($(CONFIG_ACPI_PROCESSOR),)
 obj-y				+= cstate.o processor.o
--
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