[PATCH] Don't access HID registers if running on a Hypervisor.

[Jimi Xenidis]

On Jun 22, 2006, at 12:23 PM, Olof Johansson wrote:
>
> Are you aware that this code runs only once per processor during
> boot (and/or during cpu hotplug)? A few extra cycles there won't kill
> anyone.

Hey, I never said it was a hot path, only that it had performance  
issues.
I agree about the a "few extra cycles"

> That being said, not touching the registers makes sense, but I  
> don't buy
> the performance motivation. :-)
>
>> I juts think its good practice and as Xell and newer processes come
>> along we may want to start using the PACA(?) rather then peeking at
>> the msr all the time.
>
> PACA means it's a mfspr + dependent load + test instead of mfmsr +  
> mask,
> right? It'd need benchmarking on several processors to show if it's
> better or not.
>
>
> -Olof