[PATCH] powernow-k8: don't load powernow-k8 driver when acpi=off

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when acpi=off, powernow-k8 driver is still loaded, and fails with
a firmware bug warning message.
http://bugzilla.kernel.org/show_bug.cgi?id=13695#c5

this is misleading,
we should not load powernow-k8 driver when acpi=off.
http://bugzilla.kernel.org/show_bug.cgi?id=13695

Signed-off-by: Zhang Rui <rui.zhang@xxxxxxxxx>
Tested-by: David Santamaría Rogado <howl.nsp@xxxxxxxxx>
---
 arch/x86/kernel/cpu/cpufreq/powernow-k8.c |    3 +++
 1 file changed, 3 insertions(+)

Index: linux-2.6/arch/x86/kernel/cpu/cpufreq/powernow-k8.c
===================================================================
--- linux-2.6.orig/arch/x86/kernel/cpu/cpufreq/powernow-k8.c
+++ linux-2.6/arch/x86/kernel/cpu/cpufreq/powernow-k8.c
@@ -1436,6 +1436,9 @@ static int __cpuinit powernowk8_init(voi
 {
 	unsigned int i, supported_cpus = 0;
 
+	if (acpi_disabled)
+		return 0;
+
 	for_each_online_cpu(i) {
 		int rc;
 		smp_call_function_single(i, check_supported_cpu, &rc, 1);


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