[PATCH 1/2] powerpc/cpuidle: dynamically register/unregister cpuidle_device during hotplug
From: Pingfan Liu <hidden>
Date: 2018-08-02 13:42:38
Also in:
linux-pm
Subsystem:
cpu idle time management framework, the rest · Maintainers:
"Rafael J. Wysocki", Daniel Lezcano, Linus Torvalds
cpuidle_device is touched during the cpu hotplug. At present, ppc64 just online/offline cpu during hotplug/unplug. But if using the register_cpu/unregister_cpu() API to implement the hotplug, the dir /sys/../cpuX is created/destroyed during hotplug, hence we also need to create the file cpuX/cpuidle dynamically. Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: "Rafael J. Wysocki" <redacted> Cc: Tyrel Datwyler <redacted> Cc: linux-pm@vger.kernel.org Signed-off-by: Pingfan Liu <redacted> --- drivers/cpuidle/cpuidle-powernv.c | 2 ++ drivers/cpuidle/cpuidle-pseries.c | 2 ++ 2 files changed, 4 insertions(+)
diff --git a/drivers/cpuidle/cpuidle-powernv.c b/drivers/cpuidle/cpuidle-powernv.c
index d29e4f0..94d0def 100644
--- a/drivers/cpuidle/cpuidle-powernv.c
+++ b/drivers/cpuidle/cpuidle-powernv.c@@ -166,6 +166,7 @@ static int powernv_cpuidle_cpu_online(unsigned int cpu) struct cpuidle_device *dev = per_cpu(cpuidle_devices, cpu); if (dev && cpuidle_get_driver()) { + cpuidle_register_device(dev); cpuidle_pause_and_lock(); cpuidle_enable_device(dev); cpuidle_resume_and_unlock();
@@ -181,6 +182,7 @@ static int powernv_cpuidle_cpu_dead(unsigned int cpu) cpuidle_pause_and_lock(); cpuidle_disable_device(dev); cpuidle_resume_and_unlock(); + cpuidle_unregister_device(dev); } return 0; }
diff --git a/drivers/cpuidle/cpuidle-pseries.c b/drivers/cpuidle/cpuidle-pseries.c
index 9e56bc4..a53be8a 100644
--- a/drivers/cpuidle/cpuidle-pseries.c
+++ b/drivers/cpuidle/cpuidle-pseries.c@@ -193,6 +193,7 @@ static int pseries_cpuidle_cpu_online(unsigned int cpu) struct cpuidle_device *dev = per_cpu(cpuidle_devices, cpu); if (dev && cpuidle_get_driver()) { + cpuidle_register_device(dev); cpuidle_pause_and_lock(); cpuidle_enable_device(dev); cpuidle_resume_and_unlock();
@@ -208,6 +209,7 @@ static int pseries_cpuidle_cpu_dead(unsigned int cpu) cpuidle_pause_and_lock(); cpuidle_disable_device(dev); cpuidle_resume_and_unlock(); + cpuidle_unregister_device(dev); } return 0; }
--
2.7.4