diff options
| author | Venkatesh Pallipadi <venkatesh.pallipadi@intel.com> | 2007-02-05 16:12:44 -0800 |
|---|---|---|
| committer | Dave Jones <davej@redhat.com> | 2007-02-10 20:01:47 -0500 |
| commit | 5a01f2e8f3ac134e24144d74bb48a60236f7024d (patch) | |
| tree | 8d807b81618dc1b4782e0e58a9629a6d0a09fbe3 /include/linux/cpufreq.h | |
| parent | c120069779e3e35917c15393cf2847fa79811eb6 (diff) | |
| download | lwn-5a01f2e8f3ac134e24144d74bb48a60236f7024d.tar.gz lwn-5a01f2e8f3ac134e24144d74bb48a60236f7024d.zip | |
[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/linux/cpufreq.h')
| -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 { unsigned int policy; /* see above */ struct cpufreq_governor *governor; /* see below */ - struct mutex lock; /* CPU ->setpolicy or ->target may - only be called once a time */ - struct work_struct update; /* if update_policy() needs to be * called, but you're in IRQ context */ @@ -172,11 +169,16 @@ extern int __cpufreq_driver_target(struct cpufreq_policy *policy, unsigned int relation); -extern int cpufreq_driver_getavg(struct cpufreq_policy *policy); +extern int __cpufreq_driver_getavg(struct cpufreq_policy *policy); int cpufreq_register_governor(struct cpufreq_governor *governor); void cpufreq_unregister_governor(struct cpufreq_governor *governor); +int lock_policy_rwsem_read(int cpu); +int lock_policy_rwsem_write(int cpu); +void unlock_policy_rwsem_read(int cpu); +void unlock_policy_rwsem_write(int cpu); + /********************************************************************* * CPUFREQ DRIVER INTERFACE * |