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Patch series "Skip mm selftests instead when kernel features are not present", v2. Two guard_regions tests on userfaultfd fail when userfaultfd is not present. Skip them instead. hugevm test reads kernel config to get page table level information and fails when neither /proc/config.gz nor /boot/config-* is present. Skip it instead. This patch (of 2): When userfaultfd is not compiled into kernel, userfaultfd() returns -1, causing guard_regions.uffd tests to fail. Skip the tests instead. Link: https://lkml.kernel.org/r/20250516132938.356627-1-ziy@nvidia.com Link: https://lkml.kernel.org/r/20250516132938.356627-2-ziy@nvidia.com Signed-off-by: Zi Yan <ziy@nvidia.com> Reviewed-by: Lorenzo Stoakes <lorenzo.stoakes@oracle.com> Reviewed-by: Pedro Falcato <pfalcato@suse.de> Cc: Adam Sindelar <adam@wowsignal.io> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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.