linux-kernel - [PATCH 20/79] [PATCH] do tests before do_boot

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Date:	Wed, 19 Mar 2008 14:25:15 -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 20/79] [PATCH] do tests before do_boot_cpu in i386

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

Do tests before do_boot_cpu in native_cpu_up for i386.
Tests are a little bit broader than originally, and are the
same as x86_64. Test for smp_callin is not applicable right now
and is deferred.

Signed-off-by: Glauber Costa <gcosta@...hat.com>
---
 arch/x86/kernel/smpboot_32.c |   18 +++++++++++++-----
 1 files changed, 13 insertions(+), 5 deletions(-)

diff --git a/arch/x86/kernel/smpboot_32.c b/arch/x86/kernel/smpboot_32.c
index 8144aa3..147af81 100644
--- a/arch/x86/kernel/smpboot_32.c
+++ b/arch/x86/kernel/smpboot_32.c
@@ -711,10 +711,6 @@ static int __cpuinit __smp_prepare_cpu(int cpu)
 	int	apicid, ret;
 
 	apicid = per_cpu(x86_cpu_to_apicid, cpu);
-	if (apicid == BAD_APICID) {
-		ret = -ENODEV;
-		goto exit;
-	}
 
 	info.complete = &done;
 	info.apicid = apicid;
@@ -952,10 +948,22 @@ void __init native_smp_prepare_boot_cpu(void)
 
 int __cpuinit native_cpu_up(unsigned int cpu)
 {
+	int apicid = cpu_present_to_apicid(cpu);
 	unsigned long flags;
-#ifdef CONFIG_HOTPLUG_CPU
 	int ret = 0;
 
+	WARN_ON(irqs_disabled());
+
+	Dprintk("++++++++++++++++++++=_---CPU UP  %u\n", cpu);
+
+	if (apicid == BAD_APICID || apicid == boot_cpu_physical_apicid ||
+	    !physid_isset(apicid, phys_cpu_present_map)) {
+		printk(KERN_ERR "%s: bad cpu %d\n", __func__, cpu);
+		return -EINVAL;
+	}
+
+#ifdef CONFIG_HOTPLUG_CPU
+
 	/*
 	 * We do warm boot only on cpus that had booted earlier
 	 * Otherwise cold boot is all handled from smp_boot_cpus().
-- 
1.5.0.6

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