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...nd the whole DMA API is build around devices. Working around that just feels wrong. For practical matters: DMA debugging will complain about misuse of a specific device or driver. > I understand you idea is to keep the CIO global pool for stuff that can > not be tied to a single device (i.e. ariq). So the per device stuff would > also mean more code. Would you be OK with postponing this alleged > enhancement (i.e. implement it as a patch on top of this series)? I don't like it but it's just in-kernel usage which we can change at any time. So if it helps you to do it that way,...