On Tue, Jun 09, 2015 at 08:58:54AM +0200, Christoph Hellwig wrote: > On Fri, Jun 05, 2015 at 05:19:55PM -0400, Dan Williams wrote: > > As long as a dma_map_sg() implementation avoids sg_page() conversions it > > can support scatterlists that carry "page-less" __pfn_t entries. > > However, a couple implementations require that __pfn_t_has_page() is > > always true. The Xen swiotlb implementation's entanglements with ARM and > > the Calgary MMUs requirement to have a pre-existing virtual mapping make > > them unable to support this conversion (i.e. these now have 'depends on > > !HAVE_DMA_PFN'). > > That's why we really need a whole kernel conversion and not just a piecemail > one. Given how trivial this patch is that doesn't look like a too big > task ayway.
Aye, and the SWIOTLB (baremetal), Xen SWIOTLB (x86), Xen SWIOTLB (ARM) can surely be easily tested by the Xen folks if you have patches. Please just CC the [email protected] on the patches and shout out for testing help. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
