Re: [PATCHES] add _CST support

[Len Brown <len.brown-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>]

I removed the D600 from the port replicator, and now
it is able to run in C4 w/o any hacks:

# cat /proc/acpi/processor/CPU0/power
active state:            2
max_cstate:              C3
bus master activity:     02000001
states:
    1:                  type[C1] promotion[2] demotion[-] latency[001]
usage[00111360]
   *2:                  type[C2] promotion[3] demotion[1] latency[001]
usage[00085464]
    3:                  type[C3] promotion[4] demotion[2] latency[085]
usage[00039905]
    4:                  type[C3] promotion[-] demotion[2] latency[185]
usage[00453561]

So a list of things we need comes to mind:
Enable > C1 on SMP
max_cstate able to disable C4 w/o disabling C3
"nocst" flag to compare FADT method w/ _CST
bm_check code fix -- currently has no clue of HZ
	a 100HZ kernel gets into C4 less than
	a 1000HZ kernel, likely because of this.
tick-less idle loop

cheers,
-Len

ps.
I haven't been able to reproduce the rmmod processor failure,
though I did have a console log to show that I wasn't halucinating
at 2AM this morning:

[root@d600 root]# rmmod processor
ERROR: Module processor is in use by thermal
[root@d600 root]# rmmod thermal
[root@d600 root]# rmmod processor
ERROR: Module processor is in use
[root@d600 root]# lsmod
Module                  Size  Used by
video                  20548  0
processor              30504  2
fan                     4228  0
container               4128  0
button                  6608  0
battery                10852  0
ac                      4740  0
[root@d600 root]# rmmod container
[root@d600 root]# rmmod processor
ERROR: Module processor is in use
[root@d600 root]# lsmod
Module                  Size  Used by
video                  20548  0
processor              30504  2
fan                     4228  0
button                  6608  0
battery                10852  0
ac                      4740  0




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