Re: [PATCH] asm-generic: add dma-mapping-linear.h

Arnd Bergmann
2009-06-01T10:48:45Z

On Monday 01 June 2009, Russell King wrote:
>
> Err - there's only one highmem implementation on ARM.

Sorry for not being clear enough, I meant three implementations of
page_to_dma(), depending on highmem and platform:

return (dma_addr_t)__virt_to_bus((unsigned long)page_address(page));
return (dma_addr_t)__pfn_to_bus(page_to_pfn(page));
return __arch_page_to_dma(dev, page);

The generic code right now does the first, which won't work with highmem
and also won't handle platform specific requirements that are not present
on the other architectures.