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30580b33a2
Jesper Dangaard Brouer says: ==================== Fix page_pool API and dma address storage As pointed out by David Miller in [1] the current page_pool implementation stores dma_addr_t in page->private. This won't work on 32-bit platforms with 64-bit DMA addresses since the page->private is an unsigned long and the dma_addr_t a u64. Since no driver is yet using the DMA mapping capabilities of the API let's fix this by storing the information in 'struct page' and use that to store and retrieve DMA addresses from network drivers. As long as the addresses returned from dma_map_page() are aligned the first bit, used by the compound pages code should not be set. Ilias tested the first two patches on Espressobin driver mvneta, for which we have patches for using the DMA API of page_pool. [1]: https://lore.kernel.org/netdev/20181207.230655.1261252486319967024.davem@davemloft.net/ ==================== Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com> Signed-off-by: Ilias Apalodimas <ilias.apalodimas@linaro.org> Signed-off-by: David S. Miller <davem@davemloft.net> |
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Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.