mirror of https://gitee.com/openkylin/linux.git
36 lines
798 B
C
36 lines
798 B
C
/*
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* linux/arch/arm/kernel/pmu.c
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*
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* Copyright (C) 2009 picoChip Designs Ltd, Jamie Iles
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* Copyright (C) 2010 ARM Ltd, Will Deacon
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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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*/
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#include <linux/err.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <asm/pmu.h>
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/*
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* PMU locking to ensure mutual exclusion between different subsystems.
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*/
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static unsigned long pmu_lock[BITS_TO_LONGS(ARM_NUM_PMU_DEVICES)];
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int
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reserve_pmu(enum arm_pmu_type type)
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{
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return test_and_set_bit_lock(type, pmu_lock) ? -EBUSY : 0;
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}
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EXPORT_SYMBOL_GPL(reserve_pmu);
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void
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release_pmu(enum arm_pmu_type type)
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{
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clear_bit_unlock(type, pmu_lock);
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}
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