From 2e4f1db49d97222110b6add9a2c6cf5251a41e35 Mon Sep 17 00:00:00 2001 From: "Rafael J. Wysocki" Date: Thu, 30 May 2013 21:55:46 +0200 Subject: ACPI / processor: Initialize per_cpu(processors, pr->id) properly Commit ac212b6 (ACPI / processor: Use common hotplug infrastructure) forgot about initializing the per-CPU 'processors' variables which lead to ACPI cpuidle failure to use C-states and caused boot slowdown on multi-CPU machines. Fix the problem by adding per_cpu(processors, pr->id) initialization to acpi_processor_add() and add make acpi_processor_remove() clean it up as appropriate. Also modify acpi_processor_stop() so that it doesn't clear per_cpu(processors, pr->id) on processor driver removal which would then cause problems to happen when the driver is loaded again. This version of the patch contains fixes from Yinghai Lu. Reported-and-tested-by: Yinghai Lu Reported-and-tested-by: Daniel Lezcano Signed-off-by: Rafael J. Wysocki --- drivers/acpi/acpi_processor.c | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'drivers/acpi/acpi_processor.c') diff --git a/drivers/acpi/acpi_processor.c b/drivers/acpi/acpi_processor.c index 587d2af4b323..cae2641e8d84 100644 --- a/drivers/acpi/acpi_processor.c +++ b/drivers/acpi/acpi_processor.c @@ -29,6 +29,9 @@ ACPI_MODULE_NAME("processor"); +DEFINE_PER_CPU(struct acpi_processor *, processors); +EXPORT_PER_CPU_SYMBOL(processors); + /* -------------------------------------------------------------------------- Errata Handling -------------------------------------------------------------------------- */ @@ -387,6 +390,7 @@ static int __cpuinit acpi_processor_add(struct acpi_device *device, * checks. */ per_cpu(processor_device_array, pr->id) = device; + per_cpu(processors, pr->id) = pr; dev = get_cpu_device(pr->id); ACPI_HANDLE_SET(dev, pr->handle); @@ -407,6 +411,7 @@ static int __cpuinit acpi_processor_add(struct acpi_device *device, err: free_cpumask_var(pr->throttling.shared_cpu_map); device->driver_data = NULL; + per_cpu(processors, pr->id) = NULL; err_free_pr: kfree(pr); return result; @@ -441,6 +446,7 @@ static void acpi_processor_remove(struct acpi_device *device) /* Clean up. */ per_cpu(processor_device_array, pr->id) = NULL; + per_cpu(processors, pr->id) = NULL; try_offline_node(cpu_to_node(pr->id)); /* Remove the CPU. */ -- cgit v1.2.3