Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754378Ab0BJJXx (ORCPT ); Wed, 10 Feb 2010 04:23:53 -0500 Received: from sca-es-mail-2.Sun.COM ([192.18.43.133]:39223 "EHLO sca-es-mail-2.sun.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754171Ab0BJJWN (ORCPT ); Wed, 10 Feb 2010 04:22:13 -0500 MIME-version: 1.0 Content-transfer-encoding: 7BIT Content-type: TEXT/PLAIN Date: Wed, 10 Feb 2010 01:20:38 -0800 From: Yinghai Lu Subject: [PATCH 34/35] x86: use num_processors for possible cpus In-reply-to: <1265793639-15071-1-git-send-email-yinghai@kernel.org> To: Ingo Molnar , Thomas Gleixner , "H. Peter Anvin" , Andrew Morton , Linus Torvalds Cc: Jesse Barnes , Christoph Lameter , linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org, Yinghai Lu Message-id: <1265793639-15071-35-git-send-email-yinghai@kernel.org> X-Mailer: git-send-email 1.6.4.2 References: <1265793639-15071-1-git-send-email-yinghai@kernel.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1723 Lines: 46 some systems that have disable cpus entries because same BIOS will support 2 sockets and 4 sockets and more at same time, BIOS just leave some disable entries, but those system do not support cpu hotplug. we don't need treat disabled_cpus as hotplug cpus. so we can make nr_cpu_ids smaller and save more space (pcpu data allocations), and could make some systems run with logical flat instead of physical flat apic mode -v2: change to black list instead -v3: just remove that, and the one use possible_cpus= directly. Signed-off-by: Yinghai Lu --- arch/x86/kernel/smpboot.c | 3 +-- 1 files changed, 1 insertions(+), 2 deletions(-) diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c index da99eef..51ec4b6 100644 --- a/arch/x86/kernel/smpboot.c +++ b/arch/x86/kernel/smpboot.c @@ -1194,7 +1194,6 @@ early_param("possible_cpus", _setup_possible_cpus); * - Ashok Raj * * Three ways to find out the number of additional hotplug CPUs: - * - If the BIOS specified disabled CPUs in ACPI/mptables use that. * - The user can overwrite it with possible_cpus=NUM * - Otherwise don't reserve additional CPUs. * We do this because additional CPUs waste a lot of memory. @@ -1209,7 +1208,7 @@ __init void prefill_possible_map(void) num_processors = 1; if (setup_possible_cpus == -1) - possible = num_processors + disabled_cpus; + possible = num_processors; else possible = setup_possible_cpus; -- 1.6.4.2 -- 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/