Re: [Linaro-mm-sig] [PATCHv6 7/7] ARM: dma-mapping: add support for IOMMU mapper

Hello,

On Friday, February 24, 2012 3:31 PM Arnd Bergmann wrote:

On Friday 24 February 2012, Marek Szyprowski wrote:

...

I want to use some kind of chained arrays, each of at most of PAGE_SIZE. This code doesn't really need to keep these page pointers in contiguous virtual memory area, so it will not be a problem here.

Sounds like sg_alloc_table(), could you reuse that instead of rolling your own?

I only need to store 'struct page *' there. sg_alloc_table() operates on 'struct statterlist' entries, which are 4 to 6 times larger than a simple 'struct page *' entry. I don't want to waste so much memory just for reusing a two function. Implementing the same idea with pure 'struct page *' pointers will be just a matter of a few lines.

Best regards