Received: from PACIFIC-CARRIER-ANNEX.MIT.EDU by po7.MIT.EDU (5.61/4.7) id AA13760; Sat, 30 Dec 95 17:17:06 EST
Received: from pain.lcs.mit.edu by MIT.EDU with SMTP
	id AA22104; Sat, 30 Dec 95 17:17:01 EST
Received: (from daemon@localhost) by pain.lcs.mit.edu (8.6.12/8.6.9) id QAA29740; Sat, 30 Dec 1995 16:54:25 -0500
Received: from mail.fwi.uva.nl by pain.lcs.mit.edu (8.6.12/8.6.9) with ESMTP id QAA29737 for <netbsd-developers@netbsd.org>; Sat, 30 Dec 1995 16:54:21 -0500
Received: from atlas.fwi.uva.nl
          by mail.fwi.uva.nl with ESMTP (sendmail 8.6.12/config 5.15).
          id WAA00229; Sat, 30 Dec 1995 22:54:18 +0100
Received: from localhost
          by atlas.fwi.uva.nl (sendmail 8.6.12/config 5.12).
          id WAA27306; Sat, 30 Dec 1995 22:54:12 +0100
Message-Id: <199512302154.WAA27306@atlas.fwi.uva.nl>
From: frank@fwi.uva.nl (Frank van der Linden)
X-Organisation: Faculty of Mathematics, Computer Science, Physics & Astronomy
                University of Amsterdam
                Kruislaan 403
                NL-1098 SJ Amsterdam
                The Netherlands
X-Phone:        +31 20 525 7463
X-Fax:          +31 20 525 7490
Subject: Re: sun-lamp CVS commits
To: tls@NetBSD.ORG (Thor Lancelot Simon)
Date: Sat, 30 Dec 1995 22:54:12 +0100 (MET)
Cc: netbsd-developers@NetBSD.ORG
In-Reply-To: <199512302121.QAA29524@pain.lcs.mit.edu> from "Thor Lancelot Simon" at Dec 30, 95 04:21:24 pm
X-Mailer: ELM [version 2.4 PL25]
Mime-Version: 1.0
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: 7bit
Content-Length: 550       
Sender: owner-netbsd-developers@NetBSD.ORG
Precedence: first-class
X-Loop: netbsd-developers@NetBSD.ORG

Quoting Thor Lancelot Simon,

> Could we please consider this the suggested three-day "why shouldn't we..."
> on simple_lock()?  Am I wrong that it's probably needed for SMP support?

If you want SMP support, you should do something to protect global structures
by locking. It certainly looks like the lock changes in Lite2 were done
to provide SMP support. I have no idea how complete it is, but it seems
worthwhile picking up to me, since there are several ports that will have to
deal with MP machines now or at some point in the future.

- Frank