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lib/cpumask.c
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#include <linux/slab.h> |
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#include <linux/kernel.h> #include <linux/bitops.h> #include <linux/cpumask.h> |
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#include <linux/export.h> |
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#include <linux/bootmem.h> |
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int __first_cpu(const cpumask_t *srcp) { return min_t(int, NR_CPUS, find_first_bit(srcp->bits, NR_CPUS)); } EXPORT_SYMBOL(__first_cpu); |
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int __next_cpu(int n, const cpumask_t *srcp) { return min_t(int, NR_CPUS, find_next_bit(srcp->bits, NR_CPUS, n+1)); } EXPORT_SYMBOL(__next_cpu); |
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#if NR_CPUS > 64 int __next_cpu_nr(int n, const cpumask_t *srcp) { return min_t(int, nr_cpu_ids, find_next_bit(srcp->bits, nr_cpu_ids, n+1)); } EXPORT_SYMBOL(__next_cpu_nr); #endif |
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/** * cpumask_next_and - get the next cpu in *src1p & *src2p * @n: the cpu prior to the place to search (ie. return will be > @n) * @src1p: the first cpumask pointer * @src2p: the second cpumask pointer * * Returns >= nr_cpu_ids if no further cpus set in both. */ int cpumask_next_and(int n, const struct cpumask *src1p, const struct cpumask *src2p) { while ((n = cpumask_next(n, src1p)) < nr_cpu_ids) if (cpumask_test_cpu(n, src2p)) break; return n; } EXPORT_SYMBOL(cpumask_next_and); /** * cpumask_any_but - return a "random" in a cpumask, but not this one. * @mask: the cpumask to search * @cpu: the cpu to ignore. * * Often used to find any cpu but smp_processor_id() in a mask. * Returns >= nr_cpu_ids if no cpus set. */ int cpumask_any_but(const struct cpumask *mask, unsigned int cpu) { unsigned int i; |
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cpumask_check(cpu); |
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for_each_cpu(i, mask) if (i != cpu) break; return i; } /* These are not inline because of header tangles. */ #ifdef CONFIG_CPUMASK_OFFSTACK |
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/** * alloc_cpumask_var_node - allocate a struct cpumask on a given node * @mask: pointer to cpumask_var_t where the cpumask is returned * @flags: GFP_ flags * * Only defined when CONFIG_CPUMASK_OFFSTACK=y, otherwise is * a nop returning a constant 1 (in <linux/cpumask.h>) * Returns TRUE if memory allocation succeeded, FALSE otherwise. * * In addition, mask will be NULL if this fails. Note that gcc is * usually smart enough to know that mask can never be NULL if * CONFIG_CPUMASK_OFFSTACK=n, so does code elimination in that case * too. */ |
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bool alloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags, int node) |
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{ |
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*mask = kmalloc_node(cpumask_size(), flags, node); |
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#ifdef CONFIG_DEBUG_PER_CPU_MAPS if (!*mask) { printk(KERN_ERR "=> alloc_cpumask_var: failed! "); dump_stack(); } #endif |
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/* FIXME: Bandaid to save us from old primitives which go to NR_CPUS. */ if (*mask) { |
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unsigned char *ptr = (unsigned char *)cpumask_bits(*mask); |
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unsigned int tail; tail = BITS_TO_LONGS(NR_CPUS - nr_cpumask_bits) * sizeof(long); |
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memset(ptr + cpumask_size() - tail, 0, tail); |
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} |
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return *mask != NULL; } |
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EXPORT_SYMBOL(alloc_cpumask_var_node); |
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bool zalloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags, int node) { return alloc_cpumask_var_node(mask, flags | __GFP_ZERO, node); } EXPORT_SYMBOL(zalloc_cpumask_var_node); |
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/** * alloc_cpumask_var - allocate a struct cpumask * @mask: pointer to cpumask_var_t where the cpumask is returned * @flags: GFP_ flags * * Only defined when CONFIG_CPUMASK_OFFSTACK=y, otherwise is * a nop returning a constant 1 (in <linux/cpumask.h>). * * See alloc_cpumask_var_node. */ |
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bool alloc_cpumask_var(cpumask_var_t *mask, gfp_t flags) { |
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return alloc_cpumask_var_node(mask, flags, NUMA_NO_NODE); |
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} |
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EXPORT_SYMBOL(alloc_cpumask_var); |
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bool zalloc_cpumask_var(cpumask_var_t *mask, gfp_t flags) { return alloc_cpumask_var(mask, flags | __GFP_ZERO); } EXPORT_SYMBOL(zalloc_cpumask_var); |
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/** * alloc_bootmem_cpumask_var - allocate a struct cpumask from the bootmem arena. * @mask: pointer to cpumask_var_t where the cpumask is returned * * Only defined when CONFIG_CPUMASK_OFFSTACK=y, otherwise is |
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* a nop (in <linux/cpumask.h>). |
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* Either returns an allocated (zero-filled) cpumask, or causes the * system to panic. */ |
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void __init alloc_bootmem_cpumask_var(cpumask_var_t *mask) { |
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*mask = memblock_virt_alloc(cpumask_size(), 0); |
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} |
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/** * free_cpumask_var - frees memory allocated for a struct cpumask. * @mask: cpumask to free * * This is safe on a NULL mask. */ |
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void free_cpumask_var(cpumask_var_t mask) { kfree(mask); } EXPORT_SYMBOL(free_cpumask_var); |
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/** * free_bootmem_cpumask_var - frees result of alloc_bootmem_cpumask_var * @mask: cpumask to free */ |
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void __init free_bootmem_cpumask_var(cpumask_var_t mask) |
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{ |
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memblock_free_early(__pa(mask), cpumask_size()); |
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} |
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#endif |