[Nouveau] [PATCH 2/6] instmem/gk20a: refer to IOMMU physical translation bit

[Terje Bergstrom]

On 04/20/2015 12:38 AM, Alexandre Courbot wrote:
> On Sat, Apr 18, 2015 at 12:14 AM, Terje Bergstrom <tbergstrom at nvidia.com> wrote:
>> Wouldn't that be just a more complicated way of expressing the same 
>> thing? 
> Right now we have r->offset |= BIT(priv->iommu_phys_addr_bit -
> priv->iommu_pgshift), which doesn't look much simpler. :)

One reason is that you're doing two things in the same bit operation. 
The original address has already been shifted, so you're compensating 
the shift, and you're setting bit 34.