From: Benjamin Herrenschmidt <b...@kernel.crashing.org> Date: Sat, 22 Sep 2012 07:46:40 +1000
> Right, but on ppc, GFP_DMA is a nop (no separate ZONE_DMA, or rather all > of memory is ZONE_DMA). It's always been like that afaik. > > We could support ISA device limited addressability using the iommu but > that would involve a map/unmap type API (which I remember we did support > in the old days by passing NULL to pci_map_*, but we dropped that along > the way). I think I'm going to just end up restricting this driver to X86 as was originally suggested. There seems to be no real consistent Kconfig protection for users of isa_virt_to_bus() and friends. We know that ISA_DMA_API doesn't do it, and ISA doesn't do it either as powerpc also allows that to bet set for CHRP and friends. Thanks. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
