The patch titled
Subject: userfaultfd-update-documentation-to-describe-dev-userfaultfd-v7
has been added to the -mm mm-unstable branch. Its filename is
userfaultfd-update-documentation-to-describe-dev-userfaultfd-v7.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/userfaultfd-update-documentation-to-describe-dev-userfaultfd-v7.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Axel Rasmussen <axelrasmussen@xxxxxxxxxx>
Subject: userfaultfd-update-documentation-to-describe-dev-userfaultfd-v7
Date: Fri, 19 Aug 2022 13:52:00 -0700
improve wording in two spots in the documentation, per Mike
Link: https://lkml.kernel.org/r/20220819205201.658693-5-axelrasmussen@xxxxxxxxxx
Acked-by: Peter Xu <peterx@xxxxxxxxxx>
Signed-off-by: Axel Rasmussen <axelrasmussen@xxxxxxxxxx>
Reviewed-by: Shuah Khan <skhan@xxxxxxxxxxxxxxxxxxx>
Cc: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Cc: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
Cc: Dmitry V. Levin <ldv@xxxxxxxxxxxx>
Cc: Gleb Fotengauer-Malinovskiy <glebfm@xxxxxxxxxxxx>
Cc: Hugh Dickins <hughd@xxxxxxxxxx>
Cc: Jan Kara <jack@xxxxxxx>
Cc: Jonathan Corbet <corbet@xxxxxxx>
Cc: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>
Cc: Mike Kravetz <mike.kravetz@xxxxxxxxxx>
Cc: Mike Rapoport <rppt@xxxxxxxxxx>
Cc: Mike Rapoport <rppt@xxxxxxxxxxxxx>
Cc: Nadav Amit <namit@xxxxxxxxxx>
Cc: Suren Baghdasaryan <surenb@xxxxxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Cc: Zhang Yi <yi.zhang@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
Documentation/admin-guide/mm/userfaultfd.rst | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)
--- a/Documentation/admin-guide/mm/userfaultfd.rst~userfaultfd-update-documentation-to-describe-dev-userfaultfd-v7
+++ a/Documentation/admin-guide/mm/userfaultfd.rst
@@ -66,14 +66,14 @@ userfaultfd(2) syscall. Access to this i
only. Such a userfaultfd can be created using the userfaultfd(2) syscall
with the flag UFFD_USER_MODE_ONLY.
-- In order to also trap kernel page faults for the address space, then either
- the process needs the CAP_SYS_PTRACE capability, or the system must have
+- In order to also trap kernel page faults for the address space, either the
+ process needs the CAP_SYS_PTRACE capability, or the system must have
vm.unprivileged_userfaultfd set to 1. By default, vm.unprivileged_userfaultfd
is set to 0.
-The second way, added to the kernel more recently, is by opening and issuing a
-USERFAULTFD_IOC_NEW ioctl to /dev/userfaultfd. This method yields equivalent
-userfaultfds to the userfaultfd(2) syscall.
+The second way, added to the kernel more recently, is by opening
+/dev/userfaultfd and issuing a USERFAULTFD_IOC_NEW ioctl to it. This method
+yields equivalent userfaultfds to the userfaultfd(2) syscall.
Unlike userfaultfd(2), access to /dev/userfaultfd is controlled via normal
filesystem permissions (user/group/mode), which gives fine grained access to
_
Patches currently in -mm which might be from axelrasmussen@xxxxxxxxxx are
selftests-vm-add-hugetlb_shared-userfaultfd-test-to-run_vmtestssh.patch
userfaultfd-add-dev-userfaultfd-for-fine-grained-access-control.patch
userfaultfd-add-dev-userfaultfd-for-fine-grained-access-control-v7.patch
userfaultfd-selftests-modify-selftest-to-use-dev-userfaultfd.patch
userfaultfd-selftests-modify-selftest-to-use-dev-userfaultfd-v7.patch
userfaultfd-update-documentation-to-describe-dev-userfaultfd.patch
userfaultfd-update-documentation-to-describe-dev-userfaultfd-v7.patch
selftests-vm-add-dev-userfaultfd-test-cases-to-run_vmtestssh.patch
