[PATCH V2 5/6] cpufreq: Add compatibility hack to powernow-k8

From: Matthew Garrett
Date: Fri Jun 17 2011 - 15:51:36 EST

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@xxxxxxxxxx>
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 83479b6..8591ec8 100644
--- a/drivers/cpufreq/powernow-k8.c
+++ b/drivers/cpufreq/powernow-k8.c
@@ -1545,8 +1545,12 @@ static int __cpuinit powernowk8_init(void)

- if (supported_cpus != num_online_cpus())
+ if (supported_cpus != num_online_cpus()) {
+ if (cpu_has(0, 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);

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