diff --git a/sys-kernel/ummunotify/Manifest b/sys-kernel/ummunotify/Manifest
new file mode 100644
index 0000000000..d7f5a2d25e
--- /dev/null
+++ b/sys-kernel/ummunotify/Manifest
@@ -0,0 +1 @@
+DIST ummunotify-2.tar.gz 326619 BLAKE2B 4ac329368b688eebb5ab9d064703de90e47112b169cd9448b3f6e0daa7717bdd4d1e957c75f5f87f1d30c08564c929ef50d7fe83f633b95f2abbd13014c1c48c SHA512 0650ec6dd01de97822121a720bff8cb65deaf2ec67de03a52507f47d0cfb169000dd40172f73aef7fbb83735eb8e35aed4da9c20ce5ee4ee6607a12baae7ca0f
diff --git a/sys-kernel/ummunotify/metadata.xml b/sys-kernel/ummunotify/metadata.xml
new file mode 100644
index 0000000000..f0e49c1ab7
--- /dev/null
+++ b/sys-kernel/ummunotify/metadata.xml
@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE pkgmetadata SYSTEM "http://www.gentoo.org/dtd/metadata.dtd">
+<pkgmetadata>
+	<longdescription lang="en">
+Ummunotify relays MMU notifier events to userspace.  This is useful
+for libraries that need to track the memory mapping of applications;
+for example, MPI implementations using RDMA want to cache memory
+registrations for performance, but tracking all possible crazy cases
+such as when, say, the FORTRAN runtime frees memory is impossible
+without kernel help.
+	</longdescription>
+	<maintainer type="person">
+		<email>lssndrbarbieri@gmail.com</email>
+		<name>Alessandro Barbieri</name>
+	</maintainer>
+	<upstream>
+		<remote-id type="github">Portals4/ummunotify</remote-id>
+	</upstream>
+</pkgmetadata>
diff --git a/sys-kernel/ummunotify/ummunotify-2.ebuild b/sys-kernel/ummunotify/ummunotify-2.ebuild
new file mode 100644
index 0000000000..3b5fc4b6e2
--- /dev/null
+++ b/sys-kernel/ummunotify/ummunotify-2.ebuild
@@ -0,0 +1,44 @@
+# Copyright 1999-2021 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=7
+
+MAX_KV_MAJ="4"
+MAX_KV_MIN="13"
+MYP="${PN}-v${PV}"
+
+inherit linux-info linux-mod
+
+DESCRIPTION="Userspace support for MMU notifications"
+HOMEPAGE="
+	https://lkml.org/lkml/2010/4/22/172
+	https://github.com/Portals4/ummunotify
+"
+SRC_URI="https://github.com/Portals4/ummunotify/raw/master/${MYP}.tar.gz -> ${P}.tar.gz"
+S="${WORKDIR}/${MYP}"
+
+LICENSE="GPL-2"
+SLOT="0"
+KEYWORDS="~amd64"
+
+DOCS=( Documentation/ummunotify.txt README )
+
+MODULE_NAMES="ummunot(misc:${S}/driver:${S}/driver)"
+BUILD_TARGETS="all"
+
+pkg_pretend() {
+	# https://github.com/Portals4/ummunotify/issues/1
+	if kernel_is -ge ${MAX_KV_MAJ} ${MAX_KV_MIN}; then
+		eerror "Unsupported kernel version"
+		die
+	fi
+}
+
+src_compile() {
+	linux-mod_src_compile || die
+}
+
+src_install() {
+	einstalldocs
+	linux-mod_src_install || die
+}