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eb0bf4f097
The era of hand-rolled HIWORD_UPDATE macros is over, at least for those drivers that use constant masks. The Rockchip PCI driver, like many other Rockchip drivers, has its very own definition of HIWORD_UPDATE. Remove it, and replace its usage with either FIELD_PREP_WM16, or two new header local macros for setting/clearing a bit with the high mask, which use FIELD_PREP_WM16_CONST internally. In the process, ENCODE_LANES needed to be adjusted, as FIELD_PREP_WM16* shifts the value for us. That this is equivalent was verified by first making all FIELD_PREP_WM16 instances FIELD_PREP_WM16_CONST, then doing a static_assert() comparing it to the old macro (and for those with parameters, static_asserting for the full range of possible values with the old encode macro). What we get out of this is compile time error checking to make sure the value actually fits in the mask, and that the mask fits in the register, and also generally less icky code that writes shifted values when it actually just meant to set and clear a handful of bits. Acked-by: Bjorn Helgaas <bhelgaas@google.com> Signed-off-by: Nicolas Frattaroli <nicolas.frattaroli@collabora.com> Reviewed-by: Heiko Stuebner <heiko@sntech.de> Signed-off-by: Yury Norov (NVIDIA) <yury.norov@gmail.com> |
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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 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.