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Subject[PATCH man-pages 3/5] ioctl_userfaultfd.2: add BUGS section
Date
The features handshake is not quite convenient.
Elaborate about it in the BUGS section.

Signed-off-by: Mike Rapoport <rppt@linux.vnet.ibm.com>
---
man2/ioctl_userfaultfd.2 | 9 +++++++++
1 file changed, 9 insertions(+)

diff --git a/man2/ioctl_userfaultfd.2 b/man2/ioctl_userfaultfd.2
index e12b9de..50316de 100644
--- a/man2/ioctl_userfaultfd.2
+++ b/man2/ioctl_userfaultfd.2
@@ -650,6 +650,15 @@ operations are Linux-specific.
.SH EXAMPLE
See
.BR userfaultfd (2).
+.SH BUGS
+In order to detect available userfault features and
+enable certain subset of those features
+the usefault file descriptor must be closed after the first
+.BR UFFDIO_API
+operation that queries features availability and re-opened before
+the second
+.BR UFFDIO_API
+call that actually enables the desired features.
.SH SEE ALSO
.BR ioctl (2),
.BR mmap (2),
--
1.9.1
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