108 lines
2.4 KiB
C
108 lines
2.4 KiB
C
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/*
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* Copyright 2012 Hauke Mehrtens <hauke@hauke-m.de>
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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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* Compatibility file for Linux wireless for kernels 3.1.
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*/
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#include <linux/idr.h>
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#include <linux/cpufreq.h>
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/* This backports:
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* commit 3d73710880afa3d61cf57b5d4eb192e812eb7e4f
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* Author: Jesse Barnes <jbarnes@virtuousgeek.org>
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* Date: Tue Jun 28 10:59:12 2011 -0700
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*
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* cpufreq: expose a cpufreq_quick_get_max routine
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*/
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unsigned int compat_cpufreq_quick_get_max(unsigned int cpu)
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{
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struct cpufreq_policy *policy = cpufreq_cpu_get(cpu);
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unsigned int ret_freq = 0;
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if (policy) {
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ret_freq = policy->max;
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cpufreq_cpu_put(policy);
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}
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return ret_freq;
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}
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EXPORT_SYMBOL(compat_cpufreq_quick_get_max);
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static DEFINE_SPINLOCK(compat_simple_ida_lock);
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/**
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* ida_simple_get - get a new id.
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* @ida: the (initialized) ida.
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* @start: the minimum id (inclusive, < 0x8000000)
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* @end: the maximum id (exclusive, < 0x8000000 or 0)
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* @gfp_mask: memory allocation flags
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*
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* Allocates an id in the range start <= id < end, or returns -ENOSPC.
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* On memory allocation failure, returns -ENOMEM.
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*
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* Use ida_simple_remove() to get rid of an id.
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*/
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int compat_ida_simple_get(struct ida *ida, unsigned int start, unsigned int end,
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gfp_t gfp_mask)
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{
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int ret, id;
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unsigned int max;
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unsigned long flags;
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BUG_ON((int)start < 0);
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BUG_ON((int)end < 0);
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if (end == 0)
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max = 0x80000000;
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else {
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BUG_ON(end < start);
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max = end - 1;
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}
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again:
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if (!ida_pre_get(ida, gfp_mask))
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return -ENOMEM;
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spin_lock_irqsave(&compat_simple_ida_lock, flags);
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ret = ida_get_new_above(ida, start, &id);
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if (!ret) {
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if (id > max) {
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ida_remove(ida, id);
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ret = -ENOSPC;
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} else {
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ret = id;
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}
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}
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spin_unlock_irqrestore(&compat_simple_ida_lock, flags);
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if (unlikely(ret == -EAGAIN))
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goto again;
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return ret;
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}
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EXPORT_SYMBOL(compat_ida_simple_get);
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/**
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* ida_simple_remove - remove an allocated id.
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* @ida: the (initialized) ida.
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* @id: the id returned by ida_simple_get.
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*/
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void compat_ida_simple_remove(struct ida *ida, unsigned int id)
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{
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unsigned long flags;
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BUG_ON((int)id < 0);
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spin_lock_irqsave(&compat_simple_ida_lock, flags);
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ida_remove(ida, id);
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spin_unlock_irqrestore(&compat_simple_ida_lock, flags);
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}
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EXPORT_SYMBOL(compat_ida_simple_remove);
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/* source lib/idr.c */
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