diff options
author | Venkatesh Pallipadi <venkatesh.pallipadi@intel.com> | 2007-02-05 19:12:44 -0500 |
---|---|---|
committer | Dave Jones <davej@redhat.com> | 2007-02-10 20:01:47 -0500 |
commit | 5a01f2e8f3ac134e24144d74bb48a60236f7024d (patch) | |
tree | 8d807b81618dc1b4782e0e58a9629a6d0a09fbe3 /include | |
parent | c120069779e3e35917c15393cf2847fa79811eb6 (diff) |
[CPUFREQ] Rewrite lock in cpufreq to eliminate cpufreq/hotplug related issues
Yet another attempt to resolve cpufreq and hotplug locking issues.
Patchset has 3 patches:
* Rewrite the lock infrastructure of cpufreq using a per cpu rwsem.
* Minor restructuring of work callback in ondemand driver.
* Use the new cpufreq rwsem infrastructure in ondemand work.
This patch:
Convert policy->lock to rwsem and move it to per_cpu area.
This rwsem will protect against both changing/accessing policy
related parameters and CPU hot plug/unplug.
[malattia@linux.it: fix oops in kref_put()]
Cc: Gautham R Shenoy <ego@in.ibm.com>
Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Cc: Gautham R Shenoy <ego@in.ibm.com>
Signed-off-by: Mattia Dongili <malattia@linux.it>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Dave Jones <davej@redhat.com>
Diffstat (limited to 'include')
-rw-r--r-- | include/linux/cpufreq.h | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/include/linux/cpufreq.h b/include/linux/cpufreq.h index 7f008f6bfdc3..0899e2cdcdd1 100644 --- a/include/linux/cpufreq.h +++ b/include/linux/cpufreq.h | |||
@@ -84,9 +84,6 @@ struct cpufreq_policy { | |||
84 | unsigned int policy; /* see above */ | 84 | unsigned int policy; /* see above */ |
85 | struct cpufreq_governor *governor; /* see below */ | 85 | struct cpufreq_governor *governor; /* see below */ |
86 | 86 | ||
87 | struct mutex lock; /* CPU ->setpolicy or ->target may | ||
88 | only be called once a time */ | ||
89 | |||
90 | struct work_struct update; /* if update_policy() needs to be | 87 | struct work_struct update; /* if update_policy() needs to be |
91 | * called, but you're in IRQ context */ | 88 | * called, but you're in IRQ context */ |
92 | 89 | ||
@@ -172,11 +169,16 @@ extern int __cpufreq_driver_target(struct cpufreq_policy *policy, | |||
172 | unsigned int relation); | 169 | unsigned int relation); |
173 | 170 | ||
174 | 171 | ||
175 | extern int cpufreq_driver_getavg(struct cpufreq_policy *policy); | 172 | extern int __cpufreq_driver_getavg(struct cpufreq_policy *policy); |
176 | 173 | ||
177 | int cpufreq_register_governor(struct cpufreq_governor *governor); | 174 | int cpufreq_register_governor(struct cpufreq_governor *governor); |
178 | void cpufreq_unregister_governor(struct cpufreq_governor *governor); | 175 | void cpufreq_unregister_governor(struct cpufreq_governor *governor); |
179 | 176 | ||
177 | int lock_policy_rwsem_read(int cpu); | ||
178 | int lock_policy_rwsem_write(int cpu); | ||
179 | void unlock_policy_rwsem_read(int cpu); | ||
180 | void unlock_policy_rwsem_write(int cpu); | ||
181 | |||
180 | 182 | ||
181 | /********************************************************************* | 183 | /********************************************************************* |
182 | * CPUFREQ DRIVER INTERFACE * | 184 | * CPUFREQ DRIVER INTERFACE * |