From b25651a46a97fb6e50ee48d19701b4f778fc1004 Mon Sep 17 00:00:00 2001
From: Matt Macy <mmacy@FreeBSD.org>
Date: Sat, 19 May 2018 04:47:34 +0000
Subject: [PATCH] epoch: avoid warning when INVARIANTS is not enabled

---
 sys/sys/epoch.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sys/sys/epoch.h b/sys/sys/epoch.h
index e272a80bed8f..e1bf269c2865 100644
--- a/sys/sys/epoch.h
+++ b/sys/sys/epoch.h
@@ -63,7 +63,7 @@ static __inline void
 epoch_enter_preempt(epoch_t epoch)
 {
 	struct thread *td;
-	int nesting;
+	int nesting __unused;
 
 	td = curthread;
 	nesting = td->td_epochnest++;