Hi Christian,

On Tue, Oct 27, 2015 at 11:48:48PM +0100, Christian Borntraeger wrote:
> +static dma_addr_t dma_noop_map_page(struct device *dev, struct page *page,
> +                                   unsigned long offset, size_t size,
> +                                   enum dma_data_direction dir,
> +                                   struct dma_attrs *attrs)
> +{
> +     return page_to_phys(page) + offset;
> +}

X86 also has its own version of these noop dma_ops, see
arch/x86/kernel/pci-nommu.c. This one also checks the dma_mask and
prints a warning if the physical address doesn't fit into the mask.

I think this would make sense here too, and that we can also make x86
use the same generic noop-dma-ops your are introducing.


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