From cdaf963483a3f8b8e0745268b31af227ca90c429 Mon Sep 17 00:00:00 2001
From: Fabien Thomas <fabient@FreeBSD.org>
Date: Fri, 25 Nov 2016 17:20:23 +0000
Subject: [PATCH] Update r309143 to prevent false sharing.

Reported by:	mjg
Approved by:	so
MFC after:	1 month
---
 sys/libkern/arc4random.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/sys/libkern/arc4random.c b/sys/libkern/arc4random.c
index b5341179ac92..86431002ba89 100644
--- a/sys/libkern/arc4random.c
+++ b/sys/libkern/arc4random.c
@@ -31,13 +31,13 @@ int arc4rand_iniseed_state = ARC4_ENTR_NONE;
 MALLOC_DEFINE(M_ARC4RANDOM, "arc4random", "arc4random structures");
 
 struct arc4_s {
+	struct mtx mtx;
 	u_int8_t i, j;
 	int numruns;
 	u_int8_t sbox[256];
 	time_t t_reseed;
 
-	struct mtx mtx;
-};
+} __aligned(CACHE_LINE_SIZE);
 
 static struct arc4_s *arc4inst = NULL;