It's really not nice to page down and down and down to find out the one
or two lines that actually contain something useful - or in my case
scroll through the first three pages, then go to the bottom and start
scrolling up. ?It wastes time.

sorry

quoted

this code doesn't look smp save, it modifies page table that could be
used by another cpu. I suggest to create (at ?boot time) identity page
table and use it in order to do mmu on.

When you suspend/resume, the other CPUs will be hot-unplugged before
suspend, and hot-plugged after resume. ?SMP issues really don't come
in here, and there's not really many other ways to solve the inherent
races involved with turning on the MMU.

that's right, but in the future this code can be used also for
cpuidle, so please take that into account.
also,  I think cpu_resume_after_mmu  needs to invalidates the TLB
after restoring the old mapping.
one more comment, don't you need to restore the context ID cp15 register?
saeed