From: Cyrill Gorcunov <gorcunov@gmail.com>
Date: Fri, 15 Aug 2008 11:51:22 +0000 (+0200)
Subject: x86: apic - unify verify_local_APIC
X-Git-Url: http://git.efficios.com/?a=commitdiff_plain;h=c93baa1ae51cdba25a5f5ad37b2348e700e75daf;p=deliverable%2Flinux.git

x86: apic - unify verify_local_APIC

Signed-off-by: Cyrill Gorcunov <gorcunov@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---

diff --git a/arch/x86/kernel/apic_32.c b/arch/x86/kernel/apic_32.c
index 7783c113be24..7ef7c782a42d 100644
--- a/arch/x86/kernel/apic_32.c
+++ b/arch/x86/kernel/apic_32.c
@@ -878,6 +878,12 @@ int __init verify_local_APIC(void)
 	 */
 	reg0 = apic_read(APIC_ID);
 	apic_printk(APIC_DEBUG, "Getting ID: %x\n", reg0);
+	apic_write(APIC_ID, reg0 ^ APIC_ID_MASK);
+	reg1 = apic_read(APIC_ID);
+	apic_printk(APIC_DEBUG, "Getting ID: %x\n", reg1);
+	apic_write(APIC_ID, reg0);
+	if (reg1 != (reg0 ^ APIC_ID_MASK))
+		return 0;
 
 	/*
 	 * The next two are just to see if we have sane values.