Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758906Ab0APDIx (ORCPT ); Fri, 15 Jan 2010 22:08:53 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1758898Ab0APDIu (ORCPT ); Fri, 15 Jan 2010 22:08:50 -0500 Received: from sca-es-mail-2.Sun.COM ([192.18.43.133]:33991 "EHLO sca-es-mail-2.sun.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758870Ab0APDIZ (ORCPT ); Fri, 15 Jan 2010 22:08:25 -0500 MIME-version: 1.0 Content-transfer-encoding: 7BIT Content-type: TEXT/PLAIN Date: Fri, 15 Jan 2010 19:07:08 -0800 From: Yinghai Lu Subject: [PATCH 37/37] x86: use num_processors for possible cpus In-reply-to: <1263611228-6751-1-git-send-email-yinghai@kernel.org> To: Ingo Molnar , Thomas Gleixner , "H. Peter Anvin" , Andrew Morton , Jesse Barnes , Christoph Lameter Cc: linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org, Yinghai Lu Message-id: <1263611228-6751-38-git-send-email-yinghai@kernel.org> X-Mailer: git-send-email 1.6.4.2 References: <1263611228-6751-1-git-send-email-yinghai@kernel.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 f741c33..642440c 100644 --- a/arch/x86/kernel/smpboot.c +++ b/arch/x86/kernel/smpboot.c @@ -1190,7 +1190,6 @@ 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. @@ -1205,7 +1204,7 @@ __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/