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    SubjectRe: remove the ->mapping_error method from dma_map_ops V2
    On Thu, Nov 22, 2018 at 09:09:47AM -0800, Linus Torvalds wrote:
    > On Thu, Nov 22, 2018 at 9:07 AM Russell King - ARM Linux
    > <linux@armlinux.org.uk> wrote:
    > >
    > > I'm afraid that won't work very well - 32 bit platforms with 64-bit
    > > addresses (LPAE) would have dma_addr_t as a 64-bit value, which
    > > wouldn't fit into an unsigned long.
    >
    > Good point. So we'd have to have a special IS_DMA_ERR() function that
    > takes a dma_addr_t and checks the same "is it the top 4095 values".

    No problem with that.

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