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833bd284a4
Some platforms, like Rockchip RK3568 based Odroid M1, do not provide DMA limits information in device-tree dma-ranges property. Still some device drivers set DMA limit that relies on DMA zone at low 4GB memory area. Until commitba0fb44aed("dma-mapping: replace zone_dma_bits by zone_dma_limit"), zone_sizes_init() restricted DMA zone to low 32-bit. Restore DMA zone 32-bit limit when the platform provides no DMA bus limit information. Fixes:ba0fb44aed("dma-mapping: replace zone_dma_bits by zone_dma_limit") Reported-by: Marek Szyprowski <m.szyprowski@samsung.com> Link: https://lore.kernel.org/r/53d988b1-bdce-422a-ae4e-158f305ad703@samsung.com Suggested-by: Robin Murphy <robin.murphy@arm.com> Signed-off-by: Baruch Siach <baruch@tkos.co.il> Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Tested-by: Marek Szyprowski <m.szyprowski@samsung.com> Signed-off-by: Christoph Hellwig <hch@lst.de>
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 reStructuredText 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.