From: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Date: Sun, 16 Sep 2007 13:36:43 +0000 (+0200)
Subject: ACPI: Reevaluate C/P/T states when a cpu becomes online
X-Git-Tag: v2.6.23-rc7~38
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=729c6ba334771f28a54efd7e3b8f5ab9414ce7bc;p=linux-2.6

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>
---

diff --git a/drivers/acpi/processor_core.c b/drivers/acpi/processor_core.c
index e944aaee4e..2afb3d2086 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);
 }
 
 /*