field:
.RS
.TP
-.B UFFD_EVENT_PAGEFAULT
+.BR UFFD_EVENT_PAGEFAULT " (since Linux 4.3)"
A page-fault event.
The page-fault details are available in the
.I pagefault
field.
.TP
-.B UFFD_EVENT_FORK
+.BR UFFD_EVENT_FORK " (since Linux 4.11)"
Generated when the faulting process invokes
.BR fork (2)
system call.
field.
.\" FIXME descirbe duplication of userfault file descriptor during fork
.TP
-.B UFFD_EVENT_REMAP
+.BR UFFD_EVENT_REMAP " (since Linux 4.11)"
Generated when the faulting process invokes
.BR mremap (2)
system call.
.I remap
field.
.TP
-.B UFFD_EVENT_REMOVE
+.BR UFFD_EVENT_REMOVE " (since Linux 4.11)"
Generated when the faulting process invokes
.BR madvise (2)
system call with
.I remove
field.
.TP
-.B UFFD_EVENT_UNMAP
+.BR UFFD_EVENT_UNMAP " (since Linux 4.11)"
Generated when the faulting process unmaps a memory range,
either explicitly using
.BR munmap (2)