From 29119d3e501e7897dc3fd94c6d352af6c0d8306b Mon Sep 17 00:00:00 2001
From: Thomas Gleixner <tglx@linutronix.de>
Date: Wed, 30 Jan 2008 13:33:04 +0100
Subject: [PATCH] --- yaml --- r: 80253 b: refs/heads/master c:
 c2b84b30b8c8bbccf4d2e32f8a3a70ad09ba9ab8 h: refs/heads/master i:   80251:
 257062b1500733a1e27e59df2166edb8cc8bf9a9 v: v3

---
 [refs]                          |  2 +-
 trunk/arch/x86/kernel/apic_32.c | 13 +++++++++++++
 trunk/arch/x86/kernel/apic_64.c | 12 ++++++++++++
 3 files changed, 26 insertions(+), 1 deletion(-)

diff --git a/[refs] b/[refs]
index 5b1c78376110..8c5a85781f0e 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 387faedb1dee2e917811acd05902cc36142a4850
+refs/heads/master: c2b84b30b8c8bbccf4d2e32f8a3a70ad09ba9ab8
diff --git a/trunk/arch/x86/kernel/apic_32.c b/trunk/arch/x86/kernel/apic_32.c
index cbcf72cde956..20d4dbc42e6e 100644
--- a/trunk/arch/x86/kernel/apic_32.c
+++ b/trunk/arch/x86/kernel/apic_32.c
@@ -470,6 +470,19 @@ void __init setup_boot_APIC_clock(void)
 
 	local_apic_timer_verify_ok = 1;
 
+	/*
+	 * Do a sanity check on the APIC calibration result
+	 */
+	if (calibration_result < (1000000 / HZ)) {
+		local_irq_enable();
+		printk(KERN_WARNING
+		       "APIC frequency too slow, disabling apic timer\n");
+		/* No broadcast on UP ! */
+		if (num_possible_cpus() > 1)
+			setup_APIC_timer();
+		return;
+	}
+
 	/* We trust the pm timer based calibration */
 	if (!pm_referenced) {
 		apic_printk(APIC_VERBOSE, "... verify APIC timer\n");
diff --git a/trunk/arch/x86/kernel/apic_64.c b/trunk/arch/x86/kernel/apic_64.c
index d1a696673d9d..731b48660fc4 100644
--- a/trunk/arch/x86/kernel/apic_64.c
+++ b/trunk/arch/x86/kernel/apic_64.c
@@ -383,6 +383,18 @@ void __init setup_boot_APIC_clock(void)
 	printk(KERN_INFO "Using local APIC timer interrupts.\n");
 	calibrate_APIC_clock();
 
+	/*
+	 * Do a sanity check on the APIC calibration result
+	 */
+	if (calibration_result < (1000000 / HZ)) {
+		printk(KERN_WARNING
+		       "APIC frequency too slow, disabling apic timer\n");
+		/* No broadcast on UP ! */
+		if (num_possible_cpus() > 1)
+			setup_APIC_timer();
+		return;
+	}
+
 	/*
 	 * If nmi_watchdog is set to IO_APIC, we need the
 	 * PIT/HPET going.  Otherwise register lapic as a dummy