ACPI: Reevaluate C/P/T states when a cpu becomes online

Reevaluate C/P/T states when a cpu becomes online. This avoids
the caching of the broadcast information in the clockevents layer.

Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Len Brown <len.brown@intel.com>

1 files changed, 21 insertions, 0 deletions

diff --git a/drivers/acpi/processor_core.c b/drivers/acpi/processor_core.c
index e944aaee4e06..2afb3d2086b3 100644
--- a/drivers/acpi/processor_core.c
+++ b/drivers/acpi/processor_core.c
@@ -724,6 +724,25 @@ static void acpi_processor_notify(acpi_handle handle, u32 event, void *data)
         return;
 }
 
+static int acpi_cpu_soft_notify(struct notifier_block *nfb,
+                unsigned long action, void *hcpu)
+{
+        unsigned int cpu = (unsigned long)hcpu;
+        struct acpi_processor *pr = processors[cpu];
+
+        if (action == CPU_ONLINE && pr) {
+                acpi_processor_ppc_has_changed(pr);
+                acpi_processor_cst_has_changed(pr);
+                acpi_processor_tstate_has_changed(pr);
+        }
+        return NOTIFY_OK;
+}
+
+static struct notifier_block acpi_cpu_notifier =
+{
+            .notifier_call = acpi_cpu_soft_notify,
+};
+
 static int acpi_processor_add(struct acpi_device *device)
 {
         struct acpi_processor *pr = NULL;
@@ -987,6 +1006,7 @@ void acpi_processor_install_hotplug_notify(void)
                             ACPI_UINT32_MAX,
                             processor_walk_namespace_cb, &action, NULL);
 #endif
+        register_hotcpu_notifier(&acpi_cpu_notifier);
 }
 
 static
@@ -999,6 +1019,7 @@ void acpi_processor_uninstall_hotplug_notify(void)
                             ACPI_UINT32_MAX,
                             processor_walk_namespace_cb, &action, NULL);
 #endif
+        unregister_hotcpu_notifier(&acpi_cpu_notifier);
 }
 
 /*