D50850.diff
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	diff --git a/sys/kern/sys_eventfd.c b/sys/kern/sys_eventfd.c
	--- a/sys/kern/sys_eventfd.c
	+++ b/sys/kern/sys_eventfd.c
	@@ -157,6 +157,27 @@
	free(efd, M_EVENTFD);
	}

	+static void
	+eventfd_wakeup(struct eventfd *efd)
	+{
	+ KNOTE_LOCKED(&efd->efd_sel.si_note, 0);
	+ selwakeup(&efd->efd_sel);
	+ wakeup(&efd->efd_count);
	+}
	+
	+void
	+eventfd_signal(struct eventfd *efd)
	+{
	+ mtx_lock(&efd->efd_lock);
	+
	+ if (efd->efd_count < UINT64_MAX)
	+ efd->efd_count++;
	+
	+ eventfd_wakeup(efd);
	+
	+ mtx_unlock(&efd->efd_lock);
	+}
	+
	static int
	eventfd_close(struct file fp, struct thread td)
	{
	@@ -244,9 +265,7 @@
	if (error == 0) {
	MPASS(UINT64_MAX - efd->efd_count > count);
	efd->efd_count += count;
	- KNOTE_LOCKED(&efd->efd_sel.si_note, 0);
	- selwakeup(&efd->efd_sel);
	- wakeup(&efd->efd_count);
	+ eventfd_wakeup(efd);
	}
	mtx_unlock(&efd->efd_lock);

	diff --git a/sys/sys/eventfd.h b/sys/sys/eventfd.h
	--- a/sys/sys/eventfd.h
	+++ b/sys/sys/eventfd.h
	@@ -44,6 +44,7 @@
	int flags);
	struct eventfd eventfd_get(struct file fp);
	void eventfd_put(struct eventfd *efd);
	+void eventfd_signal(struct eventfd *efd);

	#else