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e978eaca4b
The ARM64_FEATURE_MASK(), used extensively by KVM, assumes that all ID register fields are 4 bits wide but this is not the case any more, for example there are several 1 bit fields in ID_AA64SMFR0_EL1. Fortunately we now have generated constants for all the ID mask registers which can be used instead. Rather than create churn from updating existing users update the macro to reference the generated constants and replace the comment with a note advising against adding new users. There are also users of ARM64_FEATURE_FIELD_BITS in the pKVM code which will need to be fixed separately, since no relevant feature is planned to be exposed to protected guests in the immediate future there is no immediate issue with them assuming fields are 4 bits wide. Signed-off-by: Mark Brown <broonie@kernel.org> Link: https://lore.kernel.org/r/20221222-arm64-arm64-feature-mask-v1-1-c34c1e177f90@kernel.org Signed-off-by: Catalin Marinas <catalin.marinas@arm.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.