[PATCH 3/8 v2] cpufreq: Add warning message to powernow-k8

[Andre Przywara <andre.przywara@amd.com>]

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>
---
 drivers/cpufreq/Kconfig.x86   | 3 ++-
 drivers/cpufreq/powernow-k8.c | 3 +++
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/cpufreq/Kconfig.x86 b/drivers/cpufreq/Kconfig.x86
index 8d12e37..b36ca1f 100644
--- a/drivers/cpufreq/Kconfig.x86
+++ b/drivers/cpufreq/Kconfig.x86
@@ -96,7 +96,8 @@ config X86_POWERNOW_K8
 	select CPU_FREQ_TABLE
 	depends on ACPI && ACPI_PROCESSOR
 	help
-	  This adds the CPUFreq driver for K8/K10 Opteron/Athlon64 processors.
+	  This adds the CPUFreq driver for K8/early Opteron/Athlon64 processors.
+	  Support for K10 and newer processors is now in acpi-cpufreq.
 
 	  To compile this driver as a module, choose M here: the
 	  module will be called powernow-k8.
diff --git a/drivers/cpufreq/powernow-k8.c b/drivers/cpufreq/powernow-k8.c
index c0e8164..16c7fb6 100644
--- a/drivers/cpufreq/powernow-k8.c
+++ b/drivers/cpufreq/powernow-k8.c
@@ -1560,6 +1560,9 @@ 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);
-- 
1.7.12