From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754426Ab0ALCrR (ORCPT ); Mon, 11 Jan 2010 21:47:17 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753644Ab0ALCrQ (ORCPT ); Mon, 11 Jan 2010 21:47:16 -0500 Received: from sca-es-mail-2.Sun.COM ([192.18.43.133]:62515 "EHLO sca-es-mail-2.sun.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753379Ab0ALCrN (ORCPT ); Mon, 11 Jan 2010 21:47:13 -0500 MIME-version: 1.0 Content-transfer-encoding: 7BIT Content-type: TEXT/PLAIN Date: Mon, 11 Jan 2010 18:45:57 -0800 From: Yinghai Lu Subject: In-reply-to: <1263264358-3896-1-git-send-email-yinghai@kernel.org> To: Suresh Siddha , Linus Torvalds , "ananth@in.ibm.com" , Ingo Molnar , Thomas Gleixner , "H. Peter Anvin" , Andrew Morton Cc: linux-kernel@vger.kernel.org, Yinghai Lu Message-id: <1263264358-3896-3-git-send-email-yinghai@kernel.org> X-Mailer: git-send-email 1.6.4.2 References: <1263264358-3896-1-git-send-email-yinghai@kernel.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org should use nr_cpu_ids instead of num_processor, in case we have hotplug cpus. if current only have 8 cpus is up, but if we will have more cpus that will be hot added later, we should use physical flat at first. nr_cpu_ids is the total cpus that could be supported. Signed-off-by: Yinghai Lu --- arch/x86/kernel/apic/probe_32.c | 20 ++++++++++++++++++-- arch/x86/kernel/apic/probe_64.c | 3 ++- arch/x86/kernel/smpboot.c | 2 -- 3 files changed, 20 insertions(+), 5 deletions(-) Index: linux-2.6/arch/x86/kernel/apic/probe_32.c =================================================================== --- linux-2.6.orig/arch/x86/kernel/apic/probe_32.c +++ linux-2.6/arch/x86/kernel/apic/probe_32.c @@ -52,7 +52,7 @@ static int __init print_ipi_mode(void) } late_initcall(print_ipi_mode); -void default_setup_apic_routing(void) +static void local_default_setup_apic_routing(void) { #ifdef CONFIG_X86_IO_APIC printk(KERN_INFO @@ -103,7 +103,7 @@ struct apic apic_default = { .init_apic_ldr = default_init_apic_ldr, .ioapic_phys_id_map = default_ioapic_phys_id_map, - .setup_apic_routing = default_setup_apic_routing, + .setup_apic_routing = local_default_setup_apic_routing, .multi_timer_check = NULL, .apicid_to_node = default_apicid_to_node, .cpu_to_logical_apicid = default_cpu_to_logical_apicid, @@ -207,6 +207,22 @@ void __init generic_bigsmp_probe(void) apic = &apic_bigsmp; printk(KERN_INFO "Overriding APIC driver with %s\n", apic->name); + } + } +#endif +} + +void default_setup_apic_routing(void) +{ +#ifdef CONFIG_X86_BIGSMP + /* + * make sure we go to bigsmp according to real nr_cpu_ids + */ + if (!cmdline_apic && apic == &apic_default) { + if (nr_cpu_ids > 8) { + apic = &apic_bigsmp; + printk(KERN_INFO "Overriding APIC driver with %s\n", + apic->name); } } #endif Index: linux-2.6/arch/x86/kernel/smpboot.c =================================================================== --- linux-2.6.orig/arch/x86/kernel/smpboot.c +++ linux-2.6/arch/x86/kernel/smpboot.c @@ -1084,9 +1084,7 @@ void __init native_smp_prepare_cpus(unsi set_cpu_sibling_map(0); enable_IR_x2apic(); -#ifdef CONFIG_X86_64 default_setup_apic_routing(); -#endif if (smp_sanity_check(max_cpus) < 0) { printk(KERN_INFO "SMP disabled\n"); Index: linux-2.6/arch/x86/kernel/apic/probe_64.c =================================================================== --- linux-2.6.orig/arch/x86/kernel/apic/probe_64.c +++ linux-2.6/arch/x86/kernel/apic/probe_64.c @@ -67,7 +67,8 @@ void __init default_setup_apic_routing(v } #endif - if (apic == &apic_flat && num_processors > 8) + /* not just num_processors, we could have hotplug cpus */ + if (apic == &apic_flat && nr_cpu_ids > 8) apic = &apic_physflat; printk(KERN_INFO "Setting APIC routing to %s\n", apic->name);