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authorViresh Kumar <viresh.kumar@linaro.org>2013-01-14 13:23:03 +0000
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2013-02-02 00:01:14 +0100
commitb8eed8af94f9203e0cc39245ea335f4b8dc1ed31 (patch)
tree39c9e57baa6daf91295c331c6b995c9d6286b2bc /include/linux
parentf85178048c083520bd920921744dd2c4a797fbc5 (diff)
cpufreq: Simplify __cpufreq_remove_dev()
__cpufreq_remove_dev() is called on multiple occasions: cpufreq_driver unregister and cpu removals. Current implementation of this routine is overly complex without much need. If the cpu to be removed is the policy->cpu, we remove the policy first and add all other cpus again from policy->cpus and then finally call __cpufreq_remove_dev() again to remove the cpu to be deleted. Haahhhh.. There exist a simple solution to removal of a cpu: - Simply use the old policy structure - update its fields like: policy->cpu, etc. - notify any users of cpufreq, which depend on changing policy->cpu Hence this patch, which tries to implement the above theory. It is tested well by myself on ARM big.LITTLE TC2 SoC, which has 5 cores (2 A15 and 3 A7). Both A15's share same struct policy and all A7's share same policy structure. Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> Tested-by: Shawn Guo <shawn.guo@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'include/linux')
-rw-r--r--include/linux/cpufreq.h14
1 files changed, 9 insertions, 5 deletions
diff --git a/include/linux/cpufreq.h b/include/linux/cpufreq.h
index a55b88eaf96a..52be2d0c994a 100644
--- a/include/linux/cpufreq.h
+++ b/include/linux/cpufreq.h
@@ -93,7 +93,9 @@ struct cpufreq_policy {
cpumask_var_t related_cpus; /* CPUs with any coordination */
unsigned int shared_type; /* ANY or ALL affected CPUs
should set cpufreq */
- unsigned int cpu; /* cpu nr of registered CPU */
+ unsigned int cpu; /* cpu nr of CPU managing this policy */
+ unsigned int last_cpu; /* cpu nr of previous CPU that managed
+ * this policy */
struct cpufreq_cpuinfo cpuinfo;/* see above */
unsigned int min; /* in kHz */
@@ -112,10 +114,11 @@ struct cpufreq_policy {
struct completion kobj_unregister;
};
-#define CPUFREQ_ADJUST (0)
-#define CPUFREQ_INCOMPATIBLE (1)
-#define CPUFREQ_NOTIFY (2)
-#define CPUFREQ_START (3)
+#define CPUFREQ_ADJUST (0)
+#define CPUFREQ_INCOMPATIBLE (1)
+#define CPUFREQ_NOTIFY (2)
+#define CPUFREQ_START (3)
+#define CPUFREQ_UPDATE_POLICY_CPU (4)
#define CPUFREQ_SHARED_TYPE_NONE (0) /* None */
#define CPUFREQ_SHARED_TYPE_HW (1) /* HW does needed coordination */
@@ -405,6 +408,7 @@ extern struct freq_attr cpufreq_freq_attr_scaling_available_freqs;
void cpufreq_frequency_table_get_attr(struct cpufreq_frequency_table *table,
unsigned int cpu);
+void cpufreq_frequency_table_update_policy_cpu(struct cpufreq_policy *policy);
void cpufreq_frequency_table_put_attr(unsigned int cpu);
#endif /* _LINUX_CPUFREQ_H */