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34b98e55f6
The mapping from PGD/PUD/PMD to levels and shifts is very confusing, given that, due to folding, the shifts may be equal for different levels, if the macros are even #define'd to begin with. In a subsequent patch, we will modify the ID mapping code to decouple the number of levels from the kernel's view of how these types are folded, so prepare for this by reformulating the macros without the use of these types. Instead, use SWAPPER_BLOCK_SHIFT as the base quantity, and derive it from either PAGE_SHIFT or PMD_SHIFT, which -if defined at all- are defined unambiguously for a given page size, regardless of the number of configured levels. Signed-off-by: Ard Biesheuvel <ardb@kernel.org> Link: https://lore.kernel.org/r/20240214122845.2033971-65-ardb+git@google.com 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.