Introduce cpu_idle_wait() on architectures requiring modification of
pm_idle from modules, this will ensure that all processors have updated
their cached values of pm_idle upon exit.  This patch is to address the bug
report at http://bugme.osdl.org/show_bug.cgi?id=1716 and replaces the
current code fix which is in violation of normal RCU usage as pointed out
by Stephen, Dipankar and Paul.
Signed-off-by: Zwane Mwaikambo <zwane@arm.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>