From owner-svn-src-head@freebsd.org  Thu Jun 23 08:27:39 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 B97C6AC66D1;
 Thu, 23 Jun 2016 08:27:39 +0000 (UTC) (envelope-from kib@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 89AA61EDF;
 Thu, 23 Jun 2016 08:27:39 +0000 (UTC) (envelope-from kib@FreeBSD.org)
Received: from repo.freebsd.org ([127.0.1.37])
 by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id u5N8Rcxe050311;
 Thu, 23 Jun 2016 08:27:38 GMT (envelope-from kib@FreeBSD.org)
Received: (from kib@localhost)
 by repo.freebsd.org (8.15.2/8.15.2/Submit) id u5N8Rc2B050310;
 Thu, 23 Jun 2016 08:27:38 GMT (envelope-from kib@FreeBSD.org)
Message-Id: <201606230827.u5N8Rc2B050310@repo.freebsd.org>
X-Authentication-Warning: repo.freebsd.org: kib set sender to kib@FreeBSD.org
 using -f
From: Konstantin Belousov <kib@FreeBSD.org>
Date: Thu, 23 Jun 2016 08:27:38 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
 svn-src-head@freebsd.org
Subject: svn commit: r302130 - head/sys/vm
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: 2.1.22
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: Thu, 23 Jun 2016 08:27:39 -0000

Author: kib
Date: Thu Jun 23 08:27:38 2016
New Revision: 302130
URL: https://svnweb.freebsd.org/changeset/base/302130

Log:
  Add a comment noting locking regime for vm_page_xunbusy().
  
  Reviewed by:	alc
  Sponsored by:	The FreeBSD Foundation
  MFC after:	2 weeks
  Approved by:	re (gjb)

Modified:
  head/sys/vm/vm_page.h

Modified: head/sys/vm/vm_page.h
==============================================================================
--- head/sys/vm/vm_page.h	Thu Jun 23 08:26:07 2016	(r302129)
+++ head/sys/vm/vm_page.h	Thu Jun 23 08:27:38 2016	(r302130)
@@ -552,6 +552,7 @@ void vm_page_lock_assert_KBI(vm_page_t m
 		    (m));						\
 } while (0)
 
+/* Note: page m's lock must not be owned by the caller. */
 #define	vm_page_xunbusy(m) do {						\
 	if (!atomic_cmpset_rel_int(&(m)->busy_lock,			\
 	    VPB_SINGLE_EXCLUSIVER, VPB_UNBUSIED))			\