Il 08/01/2013 01:12, Rusty Russell ha scritto: >>>> >>> Unfortunately, that cannot work because not all architectures support >>>> >>> chained scatterlists. >>> >> >>> >> WHAT? I can't figure out what an arch needs to do to support this? >> > >> > It needs to use the iterator functions in its DMA driver. > But we don't care for virtio. True. >>> >> All archs we care about support them, though, so I think we can ignore >>> >> this issue for now. >> > >> > Kind of... In principle all QEMU-supported arches can use virtio, and >> > the speedup can be quite useful. And there is no Kconfig symbol for SG >> > chains that I can use to disable virtio-scsi on unsupported arches. :/ > Well, we #error if it's not supported. Then the lazy architectures can > fix it. Yeah, that would be one approach. But frankly, your patch is really disgusting. :) Not your fault, of course, but I still prefer a limited amount of duplication. Perhaps we can get the best of both worlds, I'll take a look when I have some time. Paolo -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
