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The driver has been using the offset/bitwise-shift-based approach for the CSR fields R/W operations since it was merged into the kernel. It can be simplified by using the macros defined in the linux/bitfield.h and linux/bit.h header files like BIT(), GENMASK(), FIELD_PREP(), FIELD_GET(), etc where it is required, for instance in the cached cr0 preparation method. Thus in order to have the FIELD_*()-macros utilized we just need to convert the macros with the CSR-fields offsets to the masks with the corresponding registers fields definition. That's where the GENMASK() and BIT() macros come in handy. After that the masks can be used in the FIELD_*()-macros where it's appropriate. We also need to convert the macros with the CRS-bit flags using the manual bitwise shift operations (x << y) to using the BIT() macro. Thus we'll have a more coherent set of the CSR-related macros. Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru> Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com> Link: https://lore.kernel.org/r/20211115181917.7521-5-Sergey.Semin@baikalelectronics.ru Signed-off-by: Mark Brown <broonie@kernel.org> |
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| init | ||
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| README | ||
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.