From 816284a3d0e27828b5cc35f3cf539b0711939ce3 Mon Sep 17 00:00:00 2001 From: Axel Rasmussen Date: Mon, 8 Aug 2022 10:56:13 -0700 Subject: userfaultfd: update documentation to describe /dev/userfaultfd Explain the different ways to create a new userfaultfd, and how access control works for each way. [axelrasmussen@google.com: improve wording in documentation, per Mike] Link: https://lkml.kernel.org/r/20220819205201.658693-5-axelrasmussen@google.com Link: https://lkml.kernel.org/r/20220808175614.3885028-5-axelrasmussen@google.com Signed-off-by: Axel Rasmussen Acked-by: Peter Xu Reviewed-by: Shuah Khan Cc: Al Viro Cc: Dave Hansen Cc: Dmitry V. Levin Cc: Gleb Fotengauer-Malinovskiy Cc: Hugh Dickins Cc: Jan Kara Cc: Jonathan Corbet Cc: Mel Gorman Cc: Mike Kravetz Cc: Mike Rapoport Cc: Nadav Amit Cc: Suren Baghdasaryan Cc: Vlastimil Babka Cc: Zhang Yi Cc: Mike Rapoport Signed-off-by: Andrew Morton --- Documentation/admin-guide/sysctl/vm.rst | 3 +++ 1 file changed, 3 insertions(+) (limited to 'Documentation/admin-guide/sysctl/vm.rst') diff --git a/Documentation/admin-guide/sysctl/vm.rst b/Documentation/admin-guide/sysctl/vm.rst index 9b833e439f09..988f6a4c8084 100644 --- a/Documentation/admin-guide/sysctl/vm.rst +++ b/Documentation/admin-guide/sysctl/vm.rst @@ -926,6 +926,9 @@ calls without any restrictions. The default value is 0. +Another way to control permissions for userfaultfd is to use +/dev/userfaultfd instead of userfaultfd(2). See +Documentation/admin-guide/mm/userfaultfd.rst. user_reserve_kbytes =================== -- cgit