[PATCH RFC v1 3/3] ARM hibernation / suspend-to-disk

Russell King - ARM Linux linux at arm.linux.org.uk
Sat Feb 22 05:22:21 EST 2014

On Fri, Feb 21, 2014 at 10:46:59PM -0800, Russ Dill wrote:
> If there is worry about this, you could setup a page mapping in a
> __nosave region, preventing it from being overwritten.

Why would we need _another_ set of pages tables?  Aren't two (swapper_pg_dir
and the idmap one) enough?

You do need to switch to the idmap one if you're going to call cpu_resume
at its physical address, because that requires the identity mapping in
order to work.

FTTC broadband for 0.8mile line: 5.8Mbps down 500kbps up.  Estimation
in database were 13.1 to 19Mbit for a good line, about 7.5+ for a bad.
Estimate before purchase was "up to 13.2Mbit".

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