[PATCH v4 10/10] userfaultfd: update documentation to mention shmem minor faults

Axel Rasmussen
2021-04-20T22:08:57Z

Generally, the documentation we wrote for hugetlbfs-based minor faults
still all applies. The only missing piece is to mention the new feature
flag which indicates that the kernel supports this for shmem as well.

Signed-off-by: Axel Rasmussen <axelrasmussen@google.com>
---
Documentation/admin-guide/mm/userfaultfd.rst | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/Documentation/admin-guide/mm/userfaultfd.rst b/Documentation/admin-guide/mm/userfaultfd.rst
index 3aa38e8b8361..6528036093e1 100644
--- a/Documentation/admin-guide/mm/userfaultfd.rst
+++ b/Documentation/admin-guide/mm/userfaultfd.rst
@@ -77,7 +77,8 @@ events, except page fault notifications, may be generated:

- ``UFFD_FEATURE_MINOR_HUGETLBFS`` indicates that the kernel supports
``UFFDIO_REGISTER_MODE_MINOR`` registration for hugetlbfs virtual memory
- areas.
+ areas. ``UFFD_FEATURE_MINOR_SHMEM`` is the analogous feature indicating
+ support for shmem virtual memory areas.

The userland application should set the feature flags it intends to use
when invoking the ``UFFDIO_API`` ioctl, to request that those features be
--
2.31.1.368.gbe11c130af-goog