Re: Possible discrepancy regarding streaming DMA mappings in DMA-mapping.txt?

[William Jhun]

On Fri, May 24, 2002 at 01:53:52PM -0700, David S. Miller wrote:
> Now that we've established that, you want a new operation.
> That operation is "Re-prepare DMA memory so that PCI realm
> will see it".  And the semantics of this would be to, on
> CPUs which are no cache coherent with PCI, to flush the cache
> to prevent inconsistencies between PCI and the CPU.
> 
> The CPU cache flush is needed in both cases to/from cases.
> 
> So do you finally understand why you must create a new interface
> to accomplish what you want?

Yes, that clears things up. I'll work on this.

Thanks,
William