On Tue, Oct 24, 2017 at 03:27:13PM +0200, Jan Kara wrote:

On Fri 20-10-17 15:47:53, Ross Zwisler wrote:

quoted

On Thu, Oct 19, 2017 at 02:58:17PM +0200, Jan Kara wrote:

quoted

Signed-off-by: Jan Kara <redacted>
---
 man2/mmap.2 | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/man2/mmap.2 b/man2/mmap.2
index 47c3148653be..598ff0c64f7f 100644
--- a/man2/mmap.2
+++ b/man2/mmap.2

@@ -125,6 +125,21 @@ are carried through to the underlying file.
 to the underlying file requires the use of
 .BR msync (2).)
 .TP
+.B MAP_SHARED_VALIDATE
+The same as
+.B MAP_SHARED
+except that
+.B MAP_SHARED
+mappings ignore unknown flags in
+.IR flags .
+In contrast when creating mapping of
+.B MAP_SHARED_VALIDATE
+mapping type, the kernel verifies all passed flags are known and fails the
+mapping with
+.BR EOPNOTSUPP
+otherwise. This mapping type is also required to be able to use some mapping
+flags.
+.TP

Some small nits:

I think you should maybe include a "(since Linux 4.15)" type note after the
MAP_SHARED_VALIDATE header.  You also need to update the following line:

       Both of these flags are described in POSIX.1-2001 and POSIX.1-2008.

Which used to refer to MAP_SYNC and MAP_PRIVATE.

Thanks, I've fixed these.

Cool, you can add my:

Reviewed-by: Ross Zwisler <ross.zwisler-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>