From owner-svn-src-head@freebsd.org  Fri Nov 25 17:20:25 2016
Return-Path: <owner-svn-src-head@freebsd.org>
Delivered-To: svn-src-head@mailman.ysv.freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org
 [IPv6:2001:1900:2254:206a::19:1])
 by mailman.ysv.freebsd.org (Postfix) with ESMTP id 151D0C5431F;
 Fri, 25 Nov 2016 17:20:25 +0000 (UTC)
 (envelope-from fabient@FreeBSD.org)
Received: from repo.freebsd.org (repo.freebsd.org
 [IPv6:2610:1c1:1:6068::e6a:0])
 (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits))
 (Client did not present a certificate)
 by mx1.freebsd.org (Postfix) with ESMTPS id D8C56BCC;
 Fri, 25 Nov 2016 17:20:24 +0000 (UTC)
 (envelope-from fabient@FreeBSD.org)
Received: from repo.freebsd.org ([127.0.1.37])
 by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id uAPHKOl6026673;
 Fri, 25 Nov 2016 17:20:24 GMT (envelope-from fabient@FreeBSD.org)
Received: (from fabient@localhost)
 by repo.freebsd.org (8.15.2/8.15.2/Submit) id uAPHKOUe026672;
 Fri, 25 Nov 2016 17:20:24 GMT (envelope-from fabient@FreeBSD.org)
Message-Id: <201611251720.uAPHKOUe026672@repo.freebsd.org>
X-Authentication-Warning: repo.freebsd.org: fabient set sender to
 fabient@FreeBSD.org using -f
From: Fabien Thomas <fabient@FreeBSD.org>
Date: Fri, 25 Nov 2016 17:20:24 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
 svn-src-head@freebsd.org
Subject: svn commit: r309146 - head/sys/libkern
X-SVN-Group: head
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
X-BeenThere: svn-src-head@freebsd.org
X-Mailman-Version: 2.1.23
Precedence: list
List-Id: SVN commit messages for the src tree for head/-current
 <svn-src-head.freebsd.org>
List-Unsubscribe: <https://lists.freebsd.org/mailman/options/svn-src-head>,
 <mailto:svn-src-head-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/svn-src-head/>
List-Post: <mailto:svn-src-head@freebsd.org>
List-Help: <mailto:svn-src-head-request@freebsd.org?subject=help>
List-Subscribe: <https://lists.freebsd.org/mailman/listinfo/svn-src-head>,
 <mailto:svn-src-head-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Fri, 25 Nov 2016 17:20:25 -0000

Author: fabient
Date: Fri Nov 25 17:20:23 2016
New Revision: 309146
URL: https://svnweb.freebsd.org/changeset/base/309146

Log:
  Update r309143 to prevent false sharing.
  
  Reported by:	mjg
  Approved by:	so
  MFC after:	1 month

Modified:
  head/sys/libkern/arc4random.c

Modified: head/sys/libkern/arc4random.c
==============================================================================
--- head/sys/libkern/arc4random.c	Fri Nov 25 16:04:36 2016	(r309145)
+++ head/sys/libkern/arc4random.c	Fri Nov 25 17:20:23 2016	(r309146)
@@ -31,13 +31,13 @@ int arc4rand_iniseed_state = ARC4_ENTR_N
 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;