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Kernel PMDs can either be shared across processes or private to a process. On 64-bit, they are always shared. 32-bit non-PAE hardware does not have PMDs, but the kernel logically squishes them into the PGD and treats them as private. Here are the four cases: 64-bit: Shared 32-bit: non-PAE: Private 32-bit: PAE+ PTI: Private 32-bit: PAE+noPTI: Shared Note that 32-bit is all "Private" except for PAE+noPTI being an oddball. The 32-bit+PAE+noPTI case will be made like the rest of 32-bit shortly. But until that can be done, temporarily treat the 32-bit+PAE+noPTI case as Private. This will do unnecessary walks across pgd_list and unnecessary PTE setting but should be otherwise harmless. Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com> Link: https://lore.kernel.org/all/20250414173235.F63F50D1%40davehans-spike.ostc.intel.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 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.