cpufreq: Add warning message to powernow-k8

cpufreq modules are often loaded from init scripts that assume that
all recent AMD systems will use powernow-k8.
To inform the user of the change of support and ease the transition
to acpi-cpufreq, emit a warning message.

Signed-off-by: Andre Przywara <andre.przywara@amd.com>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>

1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/cpufreq/powernow-k8.c b/drivers/cpufreq/powernow-k8.c
index 33f17c4a1342..e2defb822bb1 100644
--- a/drivers/cpufreq/powernow-k8.c
+++ b/drivers/cpufreq/powernow-k8.c
@@ -1563,6 +1563,9 @@ static int __cpuinit powernowk8_init(void)
         if (!x86_match_cpu(powernow_k8_ids))
                 return -ENODEV;
 
+        if (static_cpu_has(X86_FEATURE_HW_PSTATE))
+                pr_warn(PFX "support for this CPU is deprecated, use acpi-cpufreq instead.\n");
+
         for_each_online_cpu(i) {
                 int rc;
                 smp_call_function_single(i, check_supported_cpu, &rc, 1);