From owner-freebsd-current@FreeBSD.ORG  Mon Mar 22 19:08:55 2010
Return-Path: <owner-freebsd-current@FreeBSD.ORG>
Delivered-To: freebsd-current@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id 08250106566B;
	Mon, 22 Mar 2010 19:08:55 +0000 (UTC) (envelope-from imp@bsdimp.com)
Received: from harmony.bsdimp.com (bsdimp.com [199.45.160.85])
	by mx1.freebsd.org (Postfix) with ESMTP id B8F5B8FC18;
	Mon, 22 Mar 2010 19:08:54 +0000 (UTC)
Received: from localhost (localhost [127.0.0.1])
	by harmony.bsdimp.com (8.14.3/8.14.1) with ESMTP id o2MJ1I2X028302;
	Mon, 22 Mar 2010 13:01:18 -0600 (MDT) (envelope-from imp@bsdimp.com)
Date: Mon, 22 Mar 2010 13:01:18 -0600 (MDT)
Message-Id: <20100322.130118.80747594461967718.imp@bsdimp.com>
To: obrien@freebsd.org
From: "M. Warner Losh" <imp@bsdimp.com>
In-Reply-To: <20100322185331.GA88847@dragon.NUXI.org>
References: <20100312171758.GB31089@dragon.NUXI.org>
	<20100312.125032.270969355930630649.imp@bsdimp.com>
	<20100322185331.GA88847@dragon.NUXI.org>
X-Mailer: Mew version 6.3 on Emacs 22.3 / Mule 5.0 (SAKAKI)
Mime-Version: 1.0
Content-Type: Text/Plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
Cc: yanefbsd@gmail.com, freebsd-current@freebsd.org, nwhitehorn@freebsd.org,
	swhetzel@gmail.com
Subject: Re: HEADS UP: COMPAT_IA32 renamed COMPAT_FREEBSD32
X-BeenThere: freebsd-current@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: Discussions about the use of FreeBSD-current
	<freebsd-current.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-current>, 
	<mailto:freebsd-current-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-current>
List-Post: <mailto:freebsd-current@freebsd.org>
List-Help: <mailto:freebsd-current-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-current>,
	<mailto:freebsd-current-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Mon, 22 Mar 2010 19:08:55 -0000

In message: <20100322185331.GA88847@dragon.NUXI.org>
            "David O'Brien" <obrien@freebsd.org> writes:
: On Fri, Mar 12, 2010 at 12:50:32PM -0700, M. Warner Losh wrote:
: > : On Thu, Mar 11, 2010 at 07:24:23PM -0700, M. Warner Losh wrote:
: > So the issue isn't as cut and dried as you might think.  There's
: > multiple different conventions used here in addition to your simple
: > example.
: 
: I guess we'd have to take a poll to find out.  Seems pretty cut and dried
: to me.  COMPAT_FREEBSDn has an established context that does not match
: this new usage.  That is - same bit'ness, compatibility with an older
: FreeBSD API for the same architecture.  All the other COMPAT_* are for
: foreign ABI compatibility.  COMPAT_LINUX32 possibly should have been
: "COMPAT_LINUX_X86_64".  (or is it MI and is usable as-is for PowerPC
: and MIPS?  I haven't looked that deeply at the code.)

no, COMPAT_LINUX32 is the right name.  While we don't have PowerPC or
MIPS linux emulation bits in the kernel, the code if for dealing with
running 32-bit binaries on 64-bit machines.  There may be a little
leakage of x86 specific goo here, but not a lot.

Warner