Re: x86 timer clean ups

[john stultz <johnstul@us.ibm.com>]

>  I need a flag for the TSC stuff that allows me to turn it off completely 
> (the 
>  voyagers run CPUs from physically different clocks, and TSC drift causes 
> huge 
>  jitters in this case).
>  
>  How about two compile options:
>  
>  CONFIG_X86_TSC meaning check for TSC and use it if it's OK
>  CONFIG_X86_PIT meaning use the PIT timer if the TSC isn't OK (or isn't 
> wanted)

Hmmm. I was thinking of possibly doing something similar to the 2.4
CONFIG_X86_HAS_TSC and CONFGI_X86_TSC_DISABLE, but I believe Linus
wasn't super happy about negative config options. You're usage sounds
reasonable, but since this is a cleanup item, do you mind if we both
look at the issue a bit more next week?

>  P.S. what about this CONFIG_X86_CYCLONE thing?  It doesn't seem to be 
> hooked 
>  into the timer infrastructure, should it be?

Not right this second. I'm waiting for the summit subarch code to
stabilize, then I'll hook it in correctly.

thanks
-john