38 lines
1.3 KiB
C
38 lines
1.3 KiB
C
/*
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* Scheduler code and data structures related to cpufreq.
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*
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* Copyright (C) 2016, Intel Corporation
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* Author: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include "sched.h"
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DEFINE_PER_CPU(struct update_util_data *, cpufreq_update_util_data);
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/**
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* cpufreq_set_update_util_data - Populate the CPU's update_util_data pointer.
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* @cpu: The CPU to set the pointer for.
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* @data: New pointer value.
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*
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* Set and publish the update_util_data pointer for the given CPU. That pointer
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* points to a struct update_util_data object containing a callback function
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* to call from cpufreq_update_util(). That function will be called from an RCU
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* read-side critical section, so it must not sleep.
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*
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* Callers must use RCU-sched callbacks to free any memory that might be
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* accessed via the old update_util_data pointer or invoke synchronize_sched()
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* right after this function to avoid use-after-free.
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*/
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void cpufreq_set_update_util_data(int cpu, struct update_util_data *data)
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{
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if (WARN_ON(data && !data->func))
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return;
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rcu_assign_pointer(per_cpu(cpufreq_update_util_data, cpu), data);
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}
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EXPORT_SYMBOL_GPL(cpufreq_set_update_util_data);
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