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87def77bb5
Transparent hugepages (THP) are not supported when using the Hash Page Table (HPT) MMU with 4K pages. Currently a HPT-only 4K kernel still allows THP to be enabled, which is misleading. Add restrictions to the PPC_THP symbol so that if the kernel is configured with 4K pages and only the HPT MMU (no Radix), then THP is disabled. Note that it's still possible to build a combined Radix/HPT kernel with 4K pages, which does allow THP to be enabled at build time. As such the HPT code still needs to provide some THP related symbols, to allow the build to succeed, but those code paths are never run. See the stubs in arch/powerpc/include/asm/book3s/64/hash-4k.h. Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://msgid.link/20240823032911.1238471-2-mpe@ellerman.id.au |
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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.