From owner-freebsd-hackers@FreeBSD.ORG  Tue Oct 26 07:28:15 2010
Return-Path: <owner-freebsd-hackers@FreeBSD.ORG>
Delivered-To: freebsd-hackers@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id DA859106564A
	for <freebsd-hackers@freebsd.org>; Tue, 26 Oct 2010 07:28:15 +0000 (UTC)
	(envelope-from avg@icyb.net.ua)
Received: from citadel.icyb.net.ua (citadel.icyb.net.ua [212.40.38.140])
	by mx1.freebsd.org (Postfix) with ESMTP id 26E518FC12
	for <freebsd-hackers@freebsd.org>; Tue, 26 Oct 2010 07:28:14 +0000 (UTC)
Received: from porto.topspin.kiev.ua (porto-e.starpoint.kiev.ua
	[212.40.38.100])
	by citadel.icyb.net.ua (8.8.8p3/ICyb-2.3exp) with ESMTP id KAA21010;
	Tue, 26 Oct 2010 10:28:11 +0300 (EEST)
	(envelope-from avg@icyb.net.ua)
Received: from localhost.topspin.kiev.ua ([127.0.0.1])
	by porto.topspin.kiev.ua with esmtp (Exim 4.34 (FreeBSD))
	id 1PAdx5-0002aS-2p; Tue, 26 Oct 2010 10:28:11 +0300
Message-ID: <4CC6830A.10701@icyb.net.ua>
Date: Tue, 26 Oct 2010 10:28:10 +0300
From: Andriy Gapon <avg@icyb.net.ua>
User-Agent: Mozilla/5.0 (X11; U; FreeBSD amd64; en-US;
	rv:1.9.2.11) Gecko/20101021 Lightning/1.0b2 Thunderbird/3.1.5
MIME-Version: 1.0
To: Selphie Keller <selphie.keller@gmail.com>
References: <AANLkTimVUzV3v9=y+Wuuf+1fC4OYxD2Gs4j+=SO-M+P9@mail.gmail.com>
In-Reply-To: <AANLkTimVUzV3v9=y+Wuuf+1fC4OYxD2Gs4j+=SO-M+P9@mail.gmail.com>
X-Enigmail-Version: 1.1.2
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: 7bit
Cc: freebsd-hackers@freebsd.org, Konstantin Belousov <kib@freebsd.org>
Subject: Re: SYSCALL_MODULE() macro and modfind() issues
X-BeenThere: freebsd-hackers@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: Technical Discussions relating to FreeBSD
	<freebsd-hackers.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-hackers>, 
	<mailto:freebsd-hackers-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-hackers>
List-Post: <mailto:freebsd-hackers@freebsd.org>
List-Help: <mailto:freebsd-hackers-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-hackers>,
	<mailto:freebsd-hackers-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Tue, 26 Oct 2010 07:28:15 -0000

on 26/10/2010 01:01 Selphie Keller said the following:
> hi fbsd-hackers,
> 
> Noticed a issue in 8.1-release, 8.1p1-release and 8.1-stable
> amd64/i386, to where modfind() will no longer find pmap_helper for the
> /usr/ports/sysutils/pmap port, or other syscall modules using
> SYSCALL_MODULE() macro.
> The issue is that modfind() function no longer finds any modules using
> SYSCALL_MODULE() macro to register the kernel module. Making it
> difficult for userland apps to call the syscall provided. modfind()
> always returns -1 which prevents modstat() from getting the required
> information to perform the syscall.
> 
> Also tested, the demo syscall module:

After commit r205320 and, apparently, its MFC you need to prefix the module with
"sys/".  For example:
modstat(modfind("sys/syscall"), &stat);

P.S.
Perhaps a KPI breakage in a stable branch?
-- 
Andriy Gapon