[PATCH v3 2/5] ARM: pm: add generic CPU suspend/resume support

[Russell King - ARM Linux]

On Mon, Feb 07, 2011 at 04:27:34PM +0200, saeed bishara wrote:
> > As I've said, there's not much other choice here.  We _have_ to have an
> > identity mapping in place to bring the MMU back online, or we'll crash.
> > That's non-optional.  So if this is a problem for cpuidle, cpuidle needs
> > to ensure that a page table switch has happened prior to the CPU going
> > down which _can_ be safely modified.
> I fully agree with you, but what I was suggesting is to create
> temporary identity page table at boot time, the resume code will load
> that page table (Context ID will be loaded with unique ASID), enable
> mmu, then the original page table and Context ID will be restored.

That's much easier to do in C code than in the assembly code.  Let's
keep the assembly code as simple as possible...