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a6933571f34a9aee843fff2aa4b96949c57d6274
Return the allocated dma_coherent_mem structure, set the use_dma_pfn_offset and print the failure warning inside of dma_init_coherent_memory instead of leaving that to the callers. Signed-off-by: Christoph Hellwig <hch@lst.de> Tested-by: Dillon Min <dillon.minfei@gmail.com>
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.
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