[PATCH 3/4] ioctl_userfaultfd.2: Add UFFD_FEATURE_THREAD_ID docs

[Peter Xu]

UFFD_FEATURE_THREAD_ID is supported in Linux 4.14.

Signed-off-by: Peter Xu <peterx@xxxxxxxxxx>
---
 man2/ioctl_userfaultfd.2 | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/man2/ioctl_userfaultfd.2 b/man2/ioctl_userfaultfd.2
index 47ae5f473..1965d1932 100644
--- a/man2/ioctl_userfaultfd.2
+++ b/man2/ioctl_userfaultfd.2
@@ -208,6 +208,10 @@ signal will be sent to the faulting process.
 Applications using this
 feature will not require the use of a userfaultfd monitor for processing
 memory accesses to the regions registered with userfaultfd.
+.BR UFFD_FEATURE_THREAD_ID " (since Linux 4.14)"
+If this feature bit is set,
+.I uffd_msg.pagefault.feat.ptid
+Will be set
 .PP
 The returned
 .I ioctls
-- 
2.26.2