From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751102AbZC0JO6 (ORCPT ); Fri, 27 Mar 2009 05:14:58 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753488AbZC0JOt (ORCPT ); Fri, 27 Mar 2009 05:14:49 -0400 Received: from mga11.intel.com ([192.55.52.93]:62109 "EHLO mga11.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753448AbZC0JOs (ORCPT ); Fri, 27 Mar 2009 05:14:48 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.38,431,1233561600"; d="scan'208";a="676463324" Date: Fri, 27 Mar 2009 10:14:42 +0100 From: Markus Metzger To: linux-kernel@vger.kernel.org, mingo@elte.hu, tglx@linutronix.de, hpa@zytor.com Cc: markus.t.metzger@intel.com, markus.t.metzger@gmail.com, roland@redhat.com, eranian@googlemail.com, oleg@redhat.com, juan.villacis@intel.com, ak@linux.jf.intel.com Subject: [patch 8/14] x86, ds: fix bounds check in ds selftest Message-ID: <20090327101442.A11521@sedona.ch.intel.com> Mime-Version: 1.0 Content-Disposition: inline User-Agent: Mutt/1.2.5i Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Allow a bts index equal to max. We don't know how the hardware implements the index wrap-around. Signed-off-by: Markus Metzger --- Index: git-tip/arch/x86/kernel/ds_selftest.c =================================================================== --- git-tip.orig/arch/x86/kernel/ds_selftest.c 2009-03-20 14:05:51.000000000 +0100 +++ git-tip/arch/x86/kernel/ds_selftest.c 2009-03-20 14:05:56.000000000 +0100 @@ -47,8 +47,13 @@ printk(KERN_CONT "bad bts buffer setup..."); error = -1; } + /* + * We allow top in [begin; end], since its not clear when the + * overflow adjustment happens: after the increment or before the + * write. + */ if ((trace->ds.top < trace->ds.begin) || - (trace->ds.end <= trace->ds.top)) { + (trace->ds.end < trace->ds.top)) { printk(KERN_CONT "bts top out of bounds..."); error = -1; } --------------------------------------------------------------------- Intel GmbH Dornacher Strasse 1 85622 Feldkirchen/Muenchen Germany Sitz der Gesellschaft: Feldkirchen bei Muenchen Geschaeftsfuehrer: Douglas Lusk, Peter Gleissner, Hannes Schwaderer Registergericht: Muenchen HRB 47456 Ust.-IdNr. VAT Registration No.: DE129385895 Citibank Frankfurt (BLZ 502 109 00) 600119052 This e-mail and any attachments may contain confidential material for the sole use of the intended recipient(s). Any review or distribution by others is strictly prohibited. If you are not the intended recipient, please contact the sender and delete all copies.