Messages in this thread | | | Date | Fri, 5 Jun 2015 14:23:41 -0700 | Subject | Re: [PATCH v4 0/9] introduce __pfn_t, evacuate struct page from sgls | From | Dan Williams <> |
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On Fri, Jun 5, 2015 at 2:19 PM, Dan Williams <dan.j.williams@intel.com> 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
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