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authorMatthew Garrett <mjg@redhat.com>2008-11-25 13:29:47 -0500
committerDave Jones <davej@redhat.com>2008-12-05 15:20:10 -0500
commite088e4c9cdb618675874becb91b2fd581ee707e6 (patch)
tree48231c406061308502f13c7781a6957ef396a739 /include/linux/cpufreq.h
parent10db2e5cbda5b4e13d2e2f134b963bee2e129999 (diff)
[CPUFREQ] Disable sysfs ui for p4-clockmod.
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>
Diffstat (limited to 'include/linux/cpufreq.h')
-rw-r--r--include/linux/cpufreq.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/cpufreq.h b/include/linux/cpufreq.h
index 1ee608fd7b77..484b3abf61bb 100644
--- a/include/linux/cpufreq.h
+++ b/include/linux/cpufreq.h
@@ -234,6 +234,7 @@ struct cpufreq_driver {
234 int (*suspend) (struct cpufreq_policy *policy, pm_message_t pmsg); 234 int (*suspend) (struct cpufreq_policy *policy, pm_message_t pmsg);
235 int (*resume) (struct cpufreq_policy *policy); 235 int (*resume) (struct cpufreq_policy *policy);
236 struct freq_attr **attr; 236 struct freq_attr **attr;
237 bool hide_interface;
237}; 238};
238 239
239/* flags */ 240/* flags */