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SubjectRe: [PATCH 3/9] dma: Add dma_virt_ops
> +lib-$(CONFIG_HAS_DMA) += dma-virt.o

There probably should be a config option for it for two reasons:

- do not bloat kernels that don't need it.
- the feature can only work for 32-bit architectures or for
64-bit architectures that set ARCH_DMA_ADDR_T_64BIT…
Altenatiely this option would have to force
ARCH_DMA_ADDR_T_64BIT when not yet set for 64-bit architectures.

And yes, this is currently broken already for, but we'd better fix it.

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