Messages in this thread | | | Date | Fri, 30 May 2008 08:07:00 +0200 | From | Haavard Skinnemoen <> | Subject | Re: MMIO and gcc re-ordering issue |
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On Fri, 30 May 2008 11:13:23 +1000 Benjamin Herrenschmidt <benh@kernel.crashing.org> wrote:
> > 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?
Haavard
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