From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759035AbXJOGhl (ORCPT ); Mon, 15 Oct 2007 02:37:41 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753324AbXJOGhc (ORCPT ); Mon, 15 Oct 2007 02:37:32 -0400 Received: from chilli.pcug.org.au ([203.10.76.44]:42069 "EHLO smtps.tip.net.au" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751634AbXJOGhc (ORCPT ); Mon, 15 Oct 2007 02:37:32 -0400 Date: Mon, 15 Oct 2007 16:37:20 +1000 From: Stephen Rothwell To: Andrew Morton Cc: Olaf Hering , linux-kernel@vger.kernel.org Subject: Re: apm system does not power off anymore Message-Id: <20071015163720.09630ee4.sfr@canb.auug.org.au> In-Reply-To: <20071014232316.4beb160f.akpm@linux-foundation.org> References: <20071012125426.GA16626@aepfle.de> <20071014232316.4beb160f.akpm@linux-foundation.org> X-Mailer: Sylpheed 2.4.7 (GTK+ 2.12.0; i486-pc-linux-gnu) Mime-Version: 1.0 Content-Type: multipart/signed; protocol="application/pgp-signature"; micalg="PGP-SHA1"; boundary="Signature=_Mon__15_Oct_2007_16_37_20_+1000_IBQ6XW/P0VFUwO0S" Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org --Signature=_Mon__15_Oct_2007_16_37_20_+1000_IBQ6XW/P0VFUwO0S Content-Type: text/plain; charset=US-ASCII Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Sun, 14 Oct 2007 23:23:16 -0700 Andrew Morton wrote: > > Also, it's bad that the operator has to provide some special boot command= -line > option to make the machine work properly. Please consider this to be a > bug. Has it always needed apm=3Dpower-off? It has always been that way because the behaviour of APM on SMP is not defined. We discovered early that it will work (at least for powering off) for most SMP machines as long as the APM calls are done on CPU 0. However on an SMP machine that does not cope, very bad things happen - thus the operator has to explictly enable the power off behaviour on an SMP box. (On UP power off is enabled by default.) --=20 Cheers, Stephen Rothwell sfr@canb.auug.org.au http://www.canb.auug.org.au/~sfr/ --Signature=_Mon__15_Oct_2007_16_37_20_+1000_IBQ6XW/P0VFUwO0S Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.6 (GNU/Linux) iD8DBQFHEwqlTgG2atn1QN8RAhmfAJ9FuQ4LGfLUKmPLGkYk551eFDsoKQCeIs94 Sn9SKQdbWOopzCM27BJxwlU= =epC5 -----END PGP SIGNATURE----- --Signature=_Mon__15_Oct_2007_16_37_20_+1000_IBQ6XW/P0VFUwO0S--