Fixing MTRR smp breakage and suspending sysdevs.

[Nigel Cunningham <ncunningham@linuxmail.org>]

Hi!

I've just had a go at fixing the issue with my implementation not
suspending the sysdevs (I believe swsusp does the same). In the process,
I reworked the MTRR support so it's not treated as a sysdev. Instead,
when we're saving cpu state, the mtrr_save function function is called.
When we go to restore CPU state, each CPU calls a function that resets
it's MTRRs and the 'main' cpu then frees the saved data. This is working
well here (did a dozen plus suspends on the trot), but I want to check
that it sounds like the right solution to you.

Perhaps this method should be made more generic? (Are there likely to be
other per-cpu state savers needed?)

One thing I have noticed is that by adding the sysdev suspend/resume
calls, I've gained a few seconds delay. I'll see if I can track down the
cause.

Regards,

Nigel
-- 
Nigel Cunningham
Pastoral Worker
Christian Reformed Church of Tuggeranong
PO Box 1004, Tuggeranong, ACT 2901

Everyone lives by faith. Some people just don't believe it.
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