> It's also incomplete as a fix because I don't see what guarantees the
 > buffer size will always exceed cache line size

There's a macro trick that adds a pad member after the buffer too, so
that it gets rounded up to the cacheline size:

 > +#define __dma_aligned               
 > __attribute__((aligned(ARCH_MIN_DMA_ALIGNMENT)))
 > +#define __dma_buffer                __dma_buffer_line(__LINE__)
 > +#define __dma_buffer_line(line)     __dma_aligned;\
 > +                            char __dma_pad_##line[0] __dma_aligned

So that part is OK at least.

 - R.
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