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[CPUFREQ] Disable sysfs ui for p4-clockmod.

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p4-clockmod has a long history of abuse.   It pretends to be a CPU
frequency scaling driver, even though it doesn't actually change
the CPU frequency, but instead just modulates the frequency with
wait-states.
The biggest misconception is that when running at the lower 'frequency'
p4-clockmod is saving power.  This isn't the case, as workloads running
slower take longer to complete, preventing the CPU from entering deep C states.

However p4-clockmod does have a purpose.  It can prevent overheating.
Having it hooked up to the cpufreq interfaces is the wrong way to achieve
cooling however. It should instead be hooked up to ACPI.

This diff introduces a means for a cpufreq driver to register with the
cpufreq core, but not present a sysfs interface.

Signed-off-by: Matthew Garrett <mjg@redhat.com>
Signed-off-by: Dave Jones <davej@redhat.com>
This commit is contained in:
Matthew Garrett
2008-11-25 13:29:47 -05:00
committed by Dave Jones
parent 10db2e5cbd
commit e088e4c9cd
3 changed files with 36 additions and 19 deletions
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include/linux/cpufreq.h
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@@ -234,6 +234,7 @@ struct cpufreq_driver {
int (*suspend) (struct cpufreq_policy *policy, pm_message_t pmsg);
int (*resume) (struct cpufreq_policy *policy);
struct freq_attr **attr;
bool hide_interface;
};
/* flags */