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3c54b7be5d
Use upper_32_bits() to extract the high-order 32 bits of a DMA address. This avoids doing a 32-position shift on a DMA address if it happens not to be 64 bits wide. Use lower_32_bits() to extract the low-order 32 bits (because that's what it's for). Suggested-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: Alex Elder <elder@linaro.org> Reviewed-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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.