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    SubjectRe: [PATCH v2 4/4] drivers: dma-coherent: use memset_io for DMA_MEMORY_IO mappings
    On Mon, 29 Feb 2016 16:09:24 +0000 Brian Starkey <brian.starkey@arm.com> wrote:

    > Use memset_io() for DMA_MEMORY_IO mappings which are mapped as I/O
    > memory, and regular memset() for DMA_MEMORY_MAP mappings.
    >
    > This fixes the below alignment fault on arm64 for DMA_MEMORY_IO
    > mappings, where memset() uses the DC ZVA instruction which is
    > invalid on device memory.

    What's the urgency of this fix? "Hair on fire needed in stable asap"
    or "Nice to have in there for 4.6" or what?


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