Need to reuse cpufreq's recalibration code

Need to reuse cpufreq's recalibration code

[Martin Cracauer]

Hi,

I am messing with the CPU clocks outside the cpufreq framework (direct
ICS manipulation).  While I plan to integrate the code into cpufreq,
at this time I cannot since all the math is pocket calculator.

What I need to do is recalibrate the CPU clocks after I change the
frequency.  I observe that the real time clock is correct, but that
CPU time is wrongly accounted for and obviously /proc/cpuinfo isn't
updated.  That happens if I use the TCS, mptmr and hpet.

I figured that the best way to proceed is that I reuse some code from
cpufreq, namely cpufreq_notify_transition().

I am looking for advise how to achieve this best without messing up
too much other code.

Maybe I can write an "empty" cpufreq implementation that does nothing
but call cpufreq_notify_transition when I touch one of it's /proc
files? 

Platform is x86_64, hardware is Core2 Conroe on D975XBX (975x chipset).

Martin
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Martin Cracauer <cracauer@cons.org>   http://www.cons.org/cracauer/