From owner-svn-src-all@FreeBSD.ORG  Tue Mar  3 17:34:10 2009
Return-Path: <owner-svn-src-all@FreeBSD.ORG>
Delivered-To: svn-src-all@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id 44A4D1065677;
	Tue,  3 Mar 2009 17:34:10 +0000 (UTC)
	(envelope-from dchagin@FreeBSD.org)
Received: from svn.freebsd.org (svn.freebsd.org [IPv6:2001:4f8:fff6::2c])
	by mx1.freebsd.org (Postfix) with ESMTP id 321E68FC21;
	Tue,  3 Mar 2009 17:34:10 +0000 (UTC)
	(envelope-from dchagin@FreeBSD.org)
Received: from svn.freebsd.org (localhost [127.0.0.1])
	by svn.freebsd.org (8.14.3/8.14.3) with ESMTP id n23HYAWT017059;
	Tue, 3 Mar 2009 17:34:10 GMT (envelope-from dchagin@svn.freebsd.org)
Received: (from dchagin@localhost)
	by svn.freebsd.org (8.14.3/8.14.3/Submit) id n23HYATi017058;
	Tue, 3 Mar 2009 17:34:10 GMT (envelope-from dchagin@svn.freebsd.org)
Message-Id: <200903031734.n23HYATi017058@svn.freebsd.org>
From: Dmitry Chagin <dchagin@FreeBSD.org>
Date: Tue, 3 Mar 2009 17:34:10 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
	svn-src-head@freebsd.org
X-SVN-Group: head
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Cc: 
Subject: svn commit: r189313 - head/sys/kern
X-BeenThere: svn-src-all@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: "SVN commit messages for the entire src tree \(except for &quot;
	user&quot; and &quot; projects&quot; \)" <svn-src-all.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/svn-src-all>,
	<mailto:svn-src-all-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/svn-src-all>
List-Post: <mailto:svn-src-all@freebsd.org>
List-Help: <mailto:svn-src-all-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/svn-src-all>,
	<mailto:svn-src-all-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Tue, 03 Mar 2009 17:34:11 -0000

Author: dchagin
Date: Tue Mar  3 17:34:09 2009
New Revision: 189313
URL: http://svn.freebsd.org/changeset/base/189313

Log:
  as suggested by jhb@, panic in case the ncpus == 0.
  it helps to catch bugs in the callers.
  
  Approved by:	kib (mentor)
  MFC after:	5 days

Modified:
  head/sys/kern/subr_smp.c

Modified: head/sys/kern/subr_smp.c
==============================================================================
--- head/sys/kern/subr_smp.c	Tue Mar  3 17:16:26 2009	(r189312)
+++ head/sys/kern/subr_smp.c	Tue Mar  3 17:34:09 2009	(r189313)
@@ -366,7 +366,7 @@ smp_rendezvous_cpus(cpumask_t map,
 		if (((1 << i) & map) != 0 && !CPU_ABSENT(i))
 			ncpus++;
 	if (ncpus == 0)
-		return;
+		panic("ncpus is 0 with map=0x%x", map);
 
 	/* obtain rendezvous lock */
 	mtx_lock_spin(&smp_ipi_mtx);