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Currently, the ptdump code deals with folded PMD or PUD levels at build time, by omitting those levels when invoking note_page. IOW, note_page() is never invoked with level == 1 if P4Ds are folded in the build configuration. With the introduction of LPA2 support, we will defer some of these folding decisions to runtime, so let's take care of this by overriding the 'level' argument when this condition triggers. Substituting the PUD or PMD strings for "PGD" when the level in question is folded at build time is no longer necessary, and so the conditional expressions can be simplified. This also makes the indirection of the 'name' field unnecessary, so change that into a char[] array, and make the whole thing __ro_after_init. Note that the mm_p?d_folded() functions currently ignore their mm pointer arguments, but let's wire them up correctly anyway. Signed-off-by: Ard Biesheuvel <ardb@kernel.org> Link: https://lore.kernel.org/r/20240214122845.2033971-83-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.