Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751936AbWCAX3f (ORCPT ); Wed, 1 Mar 2006 18:29:35 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751937AbWCAX3f (ORCPT ); Wed, 1 Mar 2006 18:29:35 -0500 Received: from e33.co.us.ibm.com ([32.97.110.151]:20452 "EHLO e33.co.us.ibm.com") by vger.kernel.org with ESMTP id S1751936AbWCAX3e (ORCPT ); Wed, 1 Mar 2006 18:29:34 -0500 Subject: Re: [PATCH] leave APIC code inactive by default on i386 From: "Darrick J. Wong" Reply-To: "Darrick J. Wong" To: Dave Jones Cc: Michael Ellerman , linux-kernel@vger.kernel.org, Chris McDermott In-Reply-To: <20060301225103.GE1440@redhat.com> References: <43D03AF0.3040703@us.ibm.com> <20060301043353.GJ28434@redhat.com> <1141248546.30185.44.camel@localhost.localdomain> <20060301221404.GA1440@redhat.com> <1141253258.30185.60.camel@localhost.localdomain> <20060301225103.GE1440@redhat.com> Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="=-f4/Czz95gw4tY4JRNSFB" Date: Wed, 01 Mar 2006 15:29:31 -0800 Message-Id: <1141255771.30185.64.camel@localhost.localdomain> Mime-Version: 1.0 X-Mailer: Evolution 2.5.91 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1809 Lines: 52 --=-f4/Czz95gw4tY4JRNSFB Content-Type: text/plain Content-Transfer-Encoding: quoted-printable On Wed, 2006-03-01 at 17:51 -0500, Dave Jones wrote: > On Wed, Mar 01, 2006 at 02:47:38PM -0800, Darrick J. Wong wrote: > > On Wed, 2006-03-01 at 17:14 -0500, Dave Jones wrote: > >=20 > > > In light of Matthew's comments in this thread though, I'm also wonde= ring > > > if we can now get by without this diff, and just enable it by defaul= t now > > > that the kernel respects that the BIOS and leaves it alone if it's b= een > > > disabled. > >=20 > > Actually, it seems that there are Lenovo ThinkCenter P4 machines with > > buggy BIOSes that tell us that we can enable the APIC ... but doing so > > eventually causes the system to hang. Granted, the Google-recommended > > fixes are "noapic" or "Update the BIOS", but perhaps it would be best = to > > leave it off _except_ for the few cases where we know that we need it. > >=20 > > (Then again, the correct solution in this case is to fix the BIOS...) >=20 > Indeed. And also blacklist the bad ones with DMI entries. Yeah. Since the kernel honors the BIOS's APIC settings, we might as well enable the APIC code by default. --D --=-f4/Czz95gw4tY4JRNSFB Content-Type: application/pgp-signature; name=signature.asc Content-Description: This is a digitally signed message part -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.2.1 (GNU/Linux) iD8DBQBEBi5ba6vRYYgWQuURAs67AJ99ZvNEAk/zXkjg+ETUxKT8v1riQQCdGPML diLZEuOdDFflo571bE97u3Q= =6HT8 -----END PGP SIGNATURE----- --=-f4/Czz95gw4tY4JRNSFB-- - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/