> | i think that now you have the same problem for ui_slock.
> 
> Well, if we don't lock then there is a problem with getting inconsistent
> values. How should we fix this? Defer it until later?

yes, it's a possible solution.

alternatives are:
	1. block unsafe interrupts when grabbing the lock.
	2. use atomic operations.  (needs to introduce MD/MI interface)

i think #1 is the easiest.

YAMAMOTO Takashi