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authorRafael J. Wysocki <rafael.j.wysocki@intel.com>2020-02-12 00:02:30 +0100
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2020-02-13 11:26:27 +0100
commit3a4a0042228a854d9b1073050620820b4a977e6e (patch)
treec577ec4a5d53479cb9cdc7caea6b5150c6827d95 /include/linux/pm_qos.h
parent02c92a378940ba1a46b6b7ad277f1b07f8093dbc (diff)
downloadlwn-3a4a0042228a854d9b1073050620820b4a977e6e.tar.gz
lwn-3a4a0042228a854d9b1073050620820b4a977e6e.zip
PM: QoS: Drop PM_QOS_CPU_DMA_LATENCY notifier chain
Notice that pm_qos_remove_notifier() is not used at all and the only caller of pm_qos_add_notifier() is the cpuidle core, which only needs the PM_QOS_CPU_DMA_LATENCY notifier to invoke wake_up_all_idle_cpus() upon changes of the PM_QOS_CPU_DMA_LATENCY target value. First, to ensure that wake_up_all_idle_cpus() will be called whenever the PM_QOS_CPU_DMA_LATENCY target value changes, modify the pm_qos_add/update/remove_request() family of functions to check if the effective constraint for the PM_QOS_CPU_DMA_LATENCY has changed and call wake_up_all_idle_cpus() directly in that case. Next, drop the PM_QOS_CPU_DMA_LATENCY notifier from cpuidle as it is not necessary any more. Finally, drop both pm_qos_add_notifier() and pm_qos_remove_notifier(), as they have no callers now, along with cpu_dma_lat_notifier which is only used by them. Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org> Reviewed-by: Amit Kucheria <amit.kucheria@linaro.org> Tested-by: Amit Kucheria <amit.kucheria@linaro.org>
Diffstat (limited to 'include/linux/pm_qos.h')
-rw-r--r--include/linux/pm_qos.h2
1 files changed, 0 insertions, 2 deletions
diff --git a/include/linux/pm_qos.h b/include/linux/pm_qos.h
index bef110aa80cc..cb57e5918a25 100644
--- a/include/linux/pm_qos.h
+++ b/include/linux/pm_qos.h
@@ -149,8 +149,6 @@ void pm_qos_update_request(struct pm_qos_request *req,
void pm_qos_remove_request(struct pm_qos_request *req);
int pm_qos_request(int pm_qos_class);
-int pm_qos_add_notifier(int pm_qos_class, struct notifier_block *notifier);
-int pm_qos_remove_notifier(int pm_qos_class, struct notifier_block *notifier);
int pm_qos_request_active(struct pm_qos_request *req);
s32 pm_qos_read_value(struct pm_qos_constraints *c);