linux-kernel - [PATCH 19/79] [PATCH] isolate logic to disable smp

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Date:	Wed, 19 Mar 2008 14:25:14 -0300
From:	Glauber de Oliveira Costa <gcosta@...hat.com>
To:	linux-kernel@...r.kernel.org
Cc:	akpm@...ux-foundation.org, tglx@...utronix.de, mingo@...e.hu,
	ak@...e.de, Glauber Costa <gcosta@...hat.com>
Subject: [PATCH 19/79] [PATCH] isolate logic to disable smp

From: Glauber Costa <gcosta@...hat.com>

Put it in a disable_smp() function, as x86_64 does

Signed-off-by: Glauber Costa <gcosta@...hat.com>
---
 arch/x86/kernel/smpboot_32.c |   32 ++++++++++++++++----------------
 1 files changed, 16 insertions(+), 16 deletions(-)

diff --git a/arch/x86/kernel/smpboot_32.c b/arch/x86/kernel/smpboot_32.c
index b44a743..8144aa3 100644
--- a/arch/x86/kernel/smpboot_32.c
+++ b/arch/x86/kernel/smpboot_32.c
@@ -742,6 +742,15 @@ void *xquad_portio;
 EXPORT_SYMBOL(xquad_portio);
 #endif
 
+static void __init disable_smp(void)
+{
+	smpboot_clear_io_apic_irqs();
+	phys_cpu_present_map = physid_mask_of_physid(0);
+	map_cpu_to_logical_apicid();
+	cpu_set(0, per_cpu(cpu_sibling_map, 0));
+	cpu_set(0, per_cpu(cpu_core_map, 0));
+}
+
 static int __init smp_sanity_check(unsigned max_cpus)
 {
 	/*
@@ -750,14 +759,10 @@ static int __init smp_sanity_check(unsigned max_cpus)
 	 */
 	if (!smp_found_config && !acpi_lapic) {
 		printk(KERN_NOTICE "SMP motherboard not detected.\n");
-		smpboot_clear_io_apic_irqs();
-		phys_cpu_present_map = physid_mask_of_physid(0);
+		disable_smp();
 		if (APIC_init_uniprocessor())
 			printk(KERN_NOTICE "Local APIC not detected."
 					   " Using dummy APIC emulation.\n");
-		map_cpu_to_logical_apicid();
-		cpu_set(0, per_cpu(cpu_sibling_map, 0));
-		cpu_set(0, per_cpu(cpu_core_map, 0));
 		return -1;
 	}
 
@@ -779,11 +784,6 @@ static int __init smp_sanity_check(unsigned max_cpus)
 		printk(KERN_ERR "BIOS bug, local APIC #%d not detected!...\n",
 			boot_cpu_physical_apicid);
 		printk(KERN_ERR "... forcing use of dummy APIC emulation. (tell your hw vendor)\n");
-		smpboot_clear_io_apic_irqs();
-		phys_cpu_present_map = physid_mask_of_physid(0);
-		map_cpu_to_logical_apicid();
-		cpu_set(0, per_cpu(cpu_sibling_map, 0));
-		cpu_set(0, per_cpu(cpu_core_map, 0));
 		return -1;
 	}
 
@@ -801,11 +801,6 @@ static int __init smp_sanity_check(unsigned max_cpus)
 			connect_bsp_APIC();
 			setup_local_APIC();
 		}
-		smpboot_clear_io_apic_irqs();
-		phys_cpu_present_map = physid_mask_of_physid(0);
-		map_cpu_to_logical_apicid();
-		cpu_set(0, per_cpu(cpu_sibling_map, 0));
-		cpu_set(0, per_cpu(cpu_core_map, 0));
 		return -1;
 	}
 	return 0;
@@ -835,7 +830,12 @@ static void __init smp_boot_cpus(unsigned int max_cpus)
 
 	set_cpu_sibling_map(0);
 
-	smp_sanity_check(max_cpus);
+	if (smp_sanity_check(max_cpus) < 0) {
+		printk(KERN_INFO "SMP disabled\n");
+		disable_smp();
+		return;
+	}
+
 	connect_bsp_APIC();
 	setup_local_APIC();
 	map_cpu_to_logical_apicid();
-- 
1.5.0.6

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