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authorArjan van de Ven <arjan@linux.intel.com>2006-07-26 13:40:07 (GMT)
committerLinus Torvalds <torvalds@g5.osdl.org>2006-07-26 14:21:40 (GMT)
commit153d7f3fcae7ed4e19328549aa9467acdfbced10 (patch)
treea7b15b844119663a276c7a99549ea5a06c16f19a /include
parent44eb123126d289bac398cac0232309c228386671 (diff)
[PATCH] Reorganize the cpufreq cpu hotplug locking to not be totally bizare
The patch below moves the cpu hotplugging higher up in the cpufreq layering; this is needed to avoid recursive taking of the cpu hotplug lock and to otherwise detangle the mess. The new rules are: 1. you must do lock_cpu_hotplug() around the following functions: __cpufreq_driver_target __cpufreq_governor (for CPUFREQ_GOV_LIMITS operation only) __cpufreq_set_policy 2. governer methods (.governer) must NOT take the lock_cpu_hotplug() lock in any way; they are called with the lock taken already 3. if your governer spawns a thread that does things, like calling __cpufreq_driver_target, your thread must honor rule #1. 4. the policy lock and other cpufreq internal locks nest within the lock_cpu_hotplug() lock. I'm not entirely happy about how the __cpufreq_governor rule ended up (conditional locking rule depending on the argument) but basically all callers pass this as a constant so it's not too horrible. The patch also removes the cpufreq_governor() function since during the locking audit it turned out to be entirely unused (so no need to fix it) The patch works on my testbox, but it could use more testing (otoh... it can't be much worse than the current code) Signed-off-by: Arjan van de Ven <arjan@linux.intel.com> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include')
-rw-r--r--include/linux/cpufreq.h3
1 files changed, 0 insertions, 3 deletions
diff --git a/include/linux/cpufreq.h b/include/linux/cpufreq.h
index 35e1376..4ea39fe 100644
--- a/include/linux/cpufreq.h
+++ b/include/linux/cpufreq.h
@@ -172,9 +172,6 @@ extern int __cpufreq_driver_target(struct cpufreq_policy *policy,
unsigned int relation);
-/* pass an event to the cpufreq governor */
-int cpufreq_governor(unsigned int cpu, unsigned int event);
-
int cpufreq_register_governor(struct cpufreq_governor *governor);
void cpufreq_unregister_governor(struct cpufreq_governor *governor);

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