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Subject[PATCH 3/8] cpufreq: Add compatibility hack to powernow-k8
Date
From: Matthew Garrett <mjg@redhat.com>

cpufreq modules are often loaded from init scripts that assume that all
recent AMD systems will use powernow-k8, so we should ensure that loading
it triggers a load of acpi-cpufreq if the latter is built as a module.
This avoids the problem of users ending up without any cpufreq support
after the transition.

Signed-off-by: Matthew Garrett <mjg@redhat.com>
Signed-off-by: Andre Przywara <andre.przywara@amd.com>
---
drivers/cpufreq/powernow-k8.c | 6 +++++-
1 files changed, 5 insertions(+), 1 deletions(-)

diff --git a/drivers/cpufreq/powernow-k8.c b/drivers/cpufreq/powernow-k8.c
index c0e8164..6e35ed2 100644
--- a/drivers/cpufreq/powernow-k8.c
+++ b/drivers/cpufreq/powernow-k8.c
@@ -1567,8 +1567,12 @@ static int __cpuinit powernowk8_init(void)
supported_cpus++;
}

- if (supported_cpus != num_online_cpus())
+ if (supported_cpus != num_online_cpus()) {
+ if (static_cpu_has(X86_FEATURE_HW_PSTATE))
+ request_module("acpi_cpufreq");
+
return -ENODEV;
+ }

printk(KERN_INFO PFX "Found %d %s (%d cpu cores) (" VERSION ")\n",
num_online_nodes(), boot_cpu_data.x86_model_id, supported_cpus);
--
1.7.4.4



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