On Fri, 2008-05-30 at 08:07 +0200, Haavard Skinnemoen wrote:

On Fri, 30 May 2008 11:13:23 +1000
Benjamin Herrenschmidt [off-list ref] wrote:

quoted

quoted

Currently, this is the only interface I know that can do native-endian
accesses, so if you take it away, I'm gonna need an alternative
interface that doesn't do byteswapping.  

Are you aware that these also don't provide any ordering guarantee ?

Yes, but I am not aware of any alternative.

I think the drivers I've written have the necessary barriers (or dma
ops with implicit barriers) that they don't actually depend on any
DMA vs. MMIO ordering guarantees. I hope MMIO vs. MMIO ordering is
guaranteed though?

Only to the same address I'd say.

Ben.