From 8f25c57f5c43023e6ecba0d0e0d50c014b2d2713 Mon Sep 17 00:00:00 2001
From: bluhm <bluhm@openbsd.org>
Date: Mon, 3 Oct 2022 14:10:53 +0000
Subject: [PATCH] Add a second membar producer into counters_zero().  Now it is
 symmetric to counters_read(). OK jmatthew@

---
 sys/kern/subr_percpu.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/sys/kern/subr_percpu.c b/sys/kern/subr_percpu.c
index ef46eae29a0..4cc66d0b81e 100644
--- a/sys/kern/subr_percpu.c
+++ b/sys/kern/subr_percpu.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: subr_percpu.c,v 1.9 2021/03/10 10:21:47 jsg Exp $ */
+/*	$OpenBSD: subr_percpu.c,v 1.10 2022/10/03 14:10:53 bluhm Exp $ */
 
 /*
  * Copyright (c) 2016 David Gwynne <dlg@openbsd.org>
@@ -213,6 +213,7 @@ counters_zero(struct cpumem *cm, unsigned int n)
 	unsigned int i;
 
 	counters = cpumem_first(&cmi, cm);
+	membar_producer();
 	do {
 		for (i = 0; i < n; i++)
 			counters[i] = 0;
-- 
2.20.1