Re: [Fdutils] DMA cache consistency bug introduced in 2.6.28

[Andi Kleen]

> > Does pmqos work with apci=off etc.? 
> 
> yes
> 
> > I didn't think it shut down
> > the classic "HLT" idle, does it? 
> 
> it does if you specify a latency of 0; it will then go into the
> spin-only state until you give up your latency requirement

I looked at it this evening, but it seems like pm_qos is not
interrupt safe (e.g. calls blocking notifiers) and floppy currently does 
enable/disable_hlt from interrupts and bottom halves.  

Would need some more infrastructure work or restructuring 
of the floppy driver.

-Andi
-- 
ak@xxxxxxxxxxxxxxx -- Speaking for myself only.
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