117 строки
2.5 KiB
C
117 строки
2.5 KiB
C
#include <linux/kernel.h>
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#include <linux/bitops.h>
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#include <linux/cpumask.h>
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#include <linux/module.h>
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#include <linux/bootmem.h>
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int __first_cpu(const cpumask_t *srcp)
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{
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return min_t(int, NR_CPUS, find_first_bit(srcp->bits, NR_CPUS));
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}
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EXPORT_SYMBOL(__first_cpu);
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int __next_cpu(int n, const cpumask_t *srcp)
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{
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return min_t(int, NR_CPUS, find_next_bit(srcp->bits, NR_CPUS, n+1));
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}
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EXPORT_SYMBOL(__next_cpu);
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#if NR_CPUS > 64
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int __next_cpu_nr(int n, const cpumask_t *srcp)
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{
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return min_t(int, nr_cpu_ids,
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find_next_bit(srcp->bits, nr_cpu_ids, n+1));
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}
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EXPORT_SYMBOL(__next_cpu_nr);
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#endif
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int __any_online_cpu(const cpumask_t *mask)
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{
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int cpu;
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for_each_cpu_mask(cpu, *mask) {
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if (cpu_online(cpu))
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break;
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}
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return cpu;
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}
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EXPORT_SYMBOL(__any_online_cpu);
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/**
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* cpumask_next_and - get the next cpu in *src1p & *src2p
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* @n: the cpu prior to the place to search (ie. return will be > @n)
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* @src1p: the first cpumask pointer
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* @src2p: the second cpumask pointer
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*
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* Returns >= nr_cpu_ids if no further cpus set in both.
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*/
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int cpumask_next_and(int n, const struct cpumask *src1p,
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const struct cpumask *src2p)
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{
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while ((n = cpumask_next(n, src1p)) < nr_cpu_ids)
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if (cpumask_test_cpu(n, src2p))
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break;
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return n;
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}
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EXPORT_SYMBOL(cpumask_next_and);
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/**
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* cpumask_any_but - return a "random" in a cpumask, but not this one.
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* @mask: the cpumask to search
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* @cpu: the cpu to ignore.
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*
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* Often used to find any cpu but smp_processor_id() in a mask.
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* Returns >= nr_cpu_ids if no cpus set.
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*/
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int cpumask_any_but(const struct cpumask *mask, unsigned int cpu)
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{
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unsigned int i;
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cpumask_check(cpu);
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for_each_cpu(i, mask)
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if (i != cpu)
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break;
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return i;
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}
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/* These are not inline because of header tangles. */
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#ifdef CONFIG_CPUMASK_OFFSTACK
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bool alloc_cpumask_var(cpumask_var_t *mask, gfp_t flags)
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{
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if (likely(slab_is_available()))
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*mask = kmalloc(cpumask_size(), flags);
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else {
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#ifdef CONFIG_DEBUG_PER_CPU_MAPS
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printk(KERN_ERR
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"=> alloc_cpumask_var: kmalloc not available!\n");
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dump_stack();
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#endif
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*mask = NULL;
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}
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#ifdef CONFIG_DEBUG_PER_CPU_MAPS
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if (!*mask) {
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printk(KERN_ERR "=> alloc_cpumask_var: failed!\n");
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dump_stack();
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}
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#endif
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return *mask != NULL;
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}
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EXPORT_SYMBOL(alloc_cpumask_var);
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void __init alloc_bootmem_cpumask_var(cpumask_var_t *mask)
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{
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*mask = alloc_bootmem(cpumask_size());
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}
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void free_cpumask_var(cpumask_var_t mask)
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{
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kfree(mask);
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}
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EXPORT_SYMBOL(free_cpumask_var);
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void __init free_bootmem_cpumask_var(cpumask_var_t mask)
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{
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free_bootmem((unsigned long)mask, cpumask_size());
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}
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#endif
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