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    SubjectRe: [PATCH] ata: libata depends on HAS_DMA
    FUJITA Tomonori wrote:
    > On Wed, 13 May 2009 17:57:14 -0600
    > Robert Hancock <hancockrwd@gmail.com> wrote:
    >
    >> Alan Cox wrote:
    >>>>> If it doesn't interfere with plain PIO mode, fine.
    >>>> I agree. There definitely needs to still be support for IDE ports that
    >>>> don't have DMA capability.
    >>> There is - it's just if the platform doesn't implement the dma_* APIs you
    >>> get a problem.
    >> Wouldn't the easiest solution be to just dummy out the DMA API calls on
    >> this platform to always fail? That would fix these compile problems..
    >
    > Can libata call dma_supported() per device to decide DMA or PIO mode?
    > Then, we can solve this problem by add dummy DMA API (just calls BUG)
    > on such architectures, without Kconfig magic or adding ifdef (like the
    > old ide stack does), I think.

    Sure it can. Which specific drivers are we talking about?

    Thanks.

    --
    tejun


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