a591d35c40
If CONFIG_PTE_MARKER_UFFD_WP is disabled, then we turn off three features in userfaultfd_api (UFFD_FEATURE_WP_HUGETLBFS_SHMEM, UFFD_FEATURE_WP_UNPOPULATED, and UFFD_FEATURE_WP_ASYNC). Currently this test always will call uffdio_regsiter with the flag UFFDIO_REGISTER_MODE_WP. However, the kernel ensures in vma_can_userfault that if the feature UFFD_FEATURE_WP_HUGETLBFS_SHMEM is disabled, only allow the VM_UFFD_WP on anonymous vmas, meaning our call to uffdio_regsiter will fail. We still want to be able to run the test even if we have CONFIG_PTE_MARKER_UFFD_WP disabled, so check to see if the feature UFFD_FEATURE_WP_HUGETLBFS_SHMEM has been turned off in the test and if so, disable us from calling uffdio_regsiter with the flag UFFDIO_REGISTER_MODE_WP. Link: https://lkml.kernel.org/r/20240626130513.120193-3-audra@redhat.com Signed-off-by: Audra Mitchell <audra@redhat.com> Reviewed-by: Peter Xu <peterx@redhat.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: Christian Brauner <brauner@kernel.org> Cc: Jan Kara <jack@suse.cz> Cc: Mike Rapoport <rppt@linux.vnet.ibm.com> Cc: Rafael Aquini <raquini@redhat.com> Cc: Shaohua Li <shli@fb.com> Cc: Shuah Khan <shuah@kernel.org> 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.