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Configurations built with support for 52-bit virtual addressing can also run on CPUs that only support 48 bits of VA space, in which case only that part of swapper_pg_dir that represents the 48-bit addressable region is relevant, and everything else is ignored by the hardware. Our software pagetable walker has little in the way of input address validation, and so it will happily start a walk from an address that is not representable by the number of paging levels that are actually active, resulting in lots of bogus output from the page table dumper unless we take care to start at a valid address. So define the start address at runtime based on vabits_actual. Signed-off-by: Ard Biesheuvel <ardb@kernel.org> Link: https://lore.kernel.org/r/20240214122845.2033971-82-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.