[PATCH] swsusp: add comments at critical places

apm.c needs save_processor_state and friends.  Add a comment to keep people
from removing it.  Describe a way to make swsusp work on non-PSE machines. 
Document purpose of acpi_restore_state.
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

arch/i386/kernel/acpi/sleep.c

@@ -56,7 +56,7 @@ int acpi_save_state_disk (void)
 }
 
 /*
- * acpi_restore_state
+ * acpi_restore_state - undo effects of acpi_save_state_mem
  */
 void acpi_restore_state_mem (void)
 {

arch/i386/power/cpu.c

@@ -148,6 +148,6 @@ void restore_processor_state(void)
 	__restore_processor_state(&saved_context);
 }
 
-
+/* Needed by apm.c */
 EXPORT_SYMBOL(save_processor_state);
 EXPORT_SYMBOL(restore_processor_state);

include/asm-i386/suspend.h

@@ -9,6 +9,9 @@
 static inline int
 arch_prepare_suspend(void)
 {
+	/* If you want to make non-PSE machine work, turn off paging
+           in do_magic. swsusp_pg_dir should have identity mapping, so
+           it could work...  */
 	if (!cpu_has_pse)
 		return -EPERM;
 	return 0;