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1042a53d0e
Before any tests are run, in set_test_type, we decide what feature(s) we are going to be testing, based upon our command line arguments. However, the supported features are not just a function of the memory type being used, so this is broken. For instance, consider writeprotect support. It is "normally" supported for anonymous memory, but furthermore it requires that the kernel has CONFIG_HAVE_ARCH_USERFAULTFD_WP. So, it is *not* supported at all on aarch64, for example. So, this fixes this by querying the kernel for the set of features it supports in set_test_type, by opening a userfaultfd and issuing a UFFDIO_API ioctl. Based upon the reported features, we toggle what tests are enabled. Link: https://lkml.kernel.org/r/20210930212309.4001967-3-axelrasmussen@google.com Signed-off-by: Axel Rasmussen <axelrasmussen@google.com> Reviewed-by: Peter Xu <peterx@redhat.com> Cc: Shuah Khan <shuah@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@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 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.