- Add {enable,disable}_nonboot_cpus() to prepare() and finish() in 
  kernel/power/disk.c
- Move swsusp __setup options there. Remove resume_status variable in favor
  of simpler 'noresume' variable, and check it in pm_resume().
- Remove software_resume() from swsusp; rename pm_resume() to software_resume().
  The latter is considerably cleaner, and leverages the core code.
- Move software_suspend() to kernel/power/main.c and shrink it down a 
  wrapper that  takes pm_sem and calls pm_suspend_disk(), which does the 
  same as the old software_suspend() did. 
  This keeps the same entry points (via ACPI sleep and the reboot() syscall),
  but actually allows those to use the low-level power states of the system
  rather than always shutting off the system.
- Remove now-unused functions from swsusp.