[28/28] PM: QoS: Make CPU latency QoS depend on CONFIG_CPU_IDLE
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Message ID 3915146.cHaPKLg5L1@kreacher
State Accepted
Commit 814d51f8889bc4afa75f647eeffd5ff0a5620e8d
Headers show
  • PM: QoS: Get rid of unuseful code and rework CPU latency QoS interface
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Commit Message

Rafael J. Wysocki Feb. 11, 2020, 11:37 p.m. UTC
From: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>

Because cpuidle is the only user of the effective constraint coming
from the CPU latency QoS, add #ifdef CONFIG_CPU_IDLE around that code
to avoid building it unnecessarily.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
 include/linux/pm_qos.h | 13 +++++++++++++
 kernel/power/qos.c     |  2 ++
 2 files changed, 15 insertions(+)

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diff --git a/include/linux/pm_qos.h b/include/linux/pm_qos.h
index df065db3f57a..4a69d4af3ff8 100644
--- a/include/linux/pm_qos.h
+++ b/include/linux/pm_qos.h
@@ -143,11 +143,24 @@  bool pm_qos_update_flags(struct pm_qos_flags *pqf,
 			 struct pm_qos_flags_request *req,
 			 enum pm_qos_req_action action, s32 val);
 s32 cpu_latency_qos_limit(void);
 bool cpu_latency_qos_request_active(struct pm_qos_request *req);
 void cpu_latency_qos_add_request(struct pm_qos_request *req, s32 value);
 void cpu_latency_qos_update_request(struct pm_qos_request *req, s32 new_value);
 void cpu_latency_qos_remove_request(struct pm_qos_request *req);
+static inline s32 cpu_latency_qos_limit(void) { return INT_MAX; }
+static inline bool cpu_latency_qos_request_active(struct pm_qos_request *req)
+	return false;
+static inline void cpu_latency_qos_add_request(struct pm_qos_request *req,
+					       s32 value) {}
+static inline void cpu_latency_qos_update_request(struct pm_qos_request *req,
+						  s32 new_value) {}
+static inline void cpu_latency_qos_remove_request(struct pm_qos_request *req) {}
 #ifdef CONFIG_PM
 enum pm_qos_flags_status __dev_pm_qos_flags(struct device *dev, s32 mask);
diff --git a/kernel/power/qos.c b/kernel/power/qos.c
index ef73573db43d..32927682bcc4 100644
--- a/kernel/power/qos.c
+++ b/kernel/power/qos.c
@@ -209,6 +209,7 @@  bool pm_qos_update_flags(struct pm_qos_flags *pqf,
 	return prev_value != curr_value;
 /* Definitions related to the CPU latency QoS. */
 static struct pm_qos_constraints cpu_latency_constraints = {
@@ -421,6 +422,7 @@  static int __init cpu_latency_qos_init(void)
 	return ret;
+#endif /* CONFIG_CPU_IDLE */
 /* Definitions related to the frequency QoS below. */