Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755402AbYGOUKv (ORCPT ); Tue, 15 Jul 2008 16:10:51 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1759203AbYGOUKZ (ORCPT ); Tue, 15 Jul 2008 16:10:25 -0400 Received: from mga01.intel.com ([192.55.52.88]:7306 "EHLO mga01.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1759166AbYGOUKX (ORCPT ); Tue, 15 Jul 2008 16:10:23 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.30,368,1212390000"; d="scan'208";a="598050001" From: "Luck, Tony" To: Alex Chiang , "linux-kernel@vger.kernel.org" , "linux-arch@vger.kernel.org" CC: "linux-acpi@vger.kernel.org" Date: Tue, 15 Jul 2008 13:10:14 -0700 Subject: RE: [PATCH 00/14] Introduce cpu_enabled_map and friends Thread-Topic: [PATCH 00/14] Introduce cpu_enabled_map and friends Thread-Index: AcjmI0usawaLE1B1TSGx02qGyB76/AAkvwew Message-ID: <57C9024A16AD2D4C97DC78E552063EA306594DA5@orsmsx505.amr.corp.intel.com> References: <20080715023344.2528.1836.stgit@blender.achiang> In-Reply-To: <20080715023344.2528.1836.stgit@blender.achiang> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: acceptlanguage: en-US Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from base64 to 8bit by alpha.home.local id m6FKAvfq003405 Content-Length: 705 Lines: 14 > Patch 14 is the money patch. It demonstrates why we might > want to go through all these gyrations. Now that ia64 presents > *all* physically present CPUs in sysfs, even if they have been > disabled by firmware, we give userspace a way to poke at those > CPUs. There's only the one bit for "disabled by firmware" ... no extra space for any extra information. How would userspace know that it was safe to poke at a disabled cpu? Perhaps firmware disabled it for some very good reason, and poking at it could cause system instability. -Tony ????{.n?+???????+%?????ݶ??w??{.n?+????{??G?????{ay?ʇڙ?,j??f???h?????????z_??(?階?ݢj"???m??????G????????????&???~???iO???z??v?^?m???? ????????I?