On Fri, Jun 5, 2015 at 2:19 PM, Dan Williams <dan.j.williams@xxxxxxxxx> wrote: > Introduce __pfn_t which: > > 1/ Allows kernel internal DAX mappings to adhere to the lifetime of the > the underlying block device. In general, it enables a mechanism to > allow any device driver to advertise "device memory" (CONFIG_DEV_PFN) > to other parts of the kernel. > > 2/ Replaces usage of struct page in struct scatterlist. A scatterlist > need only carry enough information to generate a dma address, and > removing struct page from scatterlists is a precursor to allowing DMA to > device memory. Some dma mapping implementations are not ready for a > scatterlist-pfn to reference unampped device memory, those > implementations are disabled by CONFIG_DEV_PFN=y. > > Changes since v4 [1]: v3: https://lists.01.org/pipermail/linux-nvdimm/2015-May/000749.html -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
