/* * Scheduler code and data structures related to cpufreq. * * Copyright (C) 2016, Intel Corporation * Author: Rafael J. Wysocki <rafael.j.wysocki@intel.com> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ #include "sched.h" DEFINE_PER_CPU(struct update_util_data *, cpufreq_update_util_data); /** * cpufreq_add_update_util_hook - Populate the CPU's update_util_data pointer. * @cpu: The CPU to set the pointer for. * @data: New pointer value. * @func: Callback function to set for the CPU. * * Set and publish the update_util_data pointer for the given CPU. * * The update_util_data pointer of @cpu is set to @data and the callback * function pointer in the target struct update_util_data is set to @func. * That function will be called by cpufreq_update_util() from RCU-sched * read-side critical sections, so it must not sleep. @data will always be * passed to it as the first argument which allows the function to get to the * target update_util_data structure and its container. * * The update_util_data pointer of @cpu must be NULL when this function is * called or it will WARN() and return with no effect. */ void cpufreq_add_update_util_hook(int cpu, struct update_util_data *data, void (*func)(struct update_util_data *data, u64 time, unsigned int flags)) { if (WARN_ON(!data || !func)) return; if (WARN_ON(per_cpu(cpufreq_update_util_data, cpu))) return; data->func = func; rcu_assign_pointer(per_cpu(cpufreq_update_util_data, cpu), data); } EXPORT_SYMBOL_GPL(cpufreq_add_update_util_hook); /** * cpufreq_remove_update_util_hook - Clear the CPU's update_util_data pointer. * @cpu: The CPU to clear the pointer for. * * Clear the update_util_data pointer for the given CPU. * * Callers must use RCU-sched callbacks to free any memory that might be * accessed via the old update_util_data pointer or invoke synchronize_sched() * right after this function to avoid use-after-free. */ void cpufreq_remove_update_util_hook(int cpu) { rcu_assign_pointer(per_cpu(cpufreq_update_util_data, cpu), NULL); } EXPORT_SYMBOL_GPL(cpufreq_remove_update_util_hook); 'right' method='get' action='/cgit.cgi/linux/net-next.git/log/tools/perf/pmu-events/arch/powerpc/mapfile.csv'> <input type='hidden' name='id' value='bd092ad1463ca0990581fa992e12a9b0ed295d25'/><select name='qt'> <option value='grep'>log msg</option> <option value='author'>author</option> <option value='committer'>committer</option> <option value='range'>range</option> </select> <input class='txt' type='search' size='10' name='q' value=''/> <input type='submit' value='search'/> </form> </td></tr></table> <div class='path'>path: <a href='/cgit.cgi/linux/net-next.git/log/?id=bd092ad1463ca0990581fa992e12a9b0ed295d25'>root</a>/<a href='/cgit.cgi/linux/net-next.git/log/tools?id=bd092ad1463ca0990581fa992e12a9b0ed295d25'>tools</a>/<a href='/cgit.cgi/linux/net-next.git/log/tools/perf?id=bd092ad1463ca0990581fa992e12a9b0ed295d25'>perf</a>/<a href='/cgit.cgi/linux/net-next.git/log/tools/perf/pmu-events?id=bd092ad1463ca0990581fa992e12a9b0ed295d25'>pmu-events</a>/<a href='/cgit.cgi/linux/net-next.git/log/tools/perf/pmu-events/arch?id=bd092ad1463ca0990581fa992e12a9b0ed295d25'>arch</a>/<a href='/cgit.cgi/linux/net-next.git/log/tools/perf/pmu-events/arch/powerpc?id=bd092ad1463ca0990581fa992e12a9b0ed295d25'>powerpc</a>/<a href='/cgit.cgi/linux/net-next.git/log/tools/perf/pmu-events/arch/powerpc/mapfile.csv?id=bd092ad1463ca0990581fa992e12a9b0ed295d25'>mapfile.csv</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/cgit.cgi/linux/net-next.git/log/tools/perf/pmu-events/arch/powerpc/mapfile.csv?id=bd092ad1463ca0990581fa992e12a9b0ed295d25&showmsg=1'>Expand</a>)</th><th class='left'>Author</th><th class='left'>Files</th><th class='left'>Lines</th></tr>