On Mon, 2012-07-23 at 18:36 -0500, Timur Tabi wrote: > The DMA zone only kicks in if the DMA mask is set to a size smaller > that > available physical memory. Sane HW should set the DMA mask to > DMA_BIT_MASK(36). And we have plenty of sane HW on our SOCs, but not > every device is like that. > > The whole point behind this patch is that some drivers are setting a > DMA > mask of 32, but still getting memory above 4GB.
Sure but I don't want to create the zones in the first place (and thus introduce the added pressure on the memory management) on machines that don't need it. Cheers, Ben. _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
