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>