#include <linux/slab.h>#include <linux/kernel.h>#include <linux/bitops.h>#include <linux/cpumask.h>#include <linux/export.h>#include <linux/bootmem.h> int __first_cpu(const cpumask_t *srcp){	return min_t(int, NR_CPUS, find_first_bit(srcp->bits, NR_CPUS));}EXPORT_SYMBOL(__first_cpu); 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); #if NR_CPUS > 64int __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 /** * 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; 	cpumask_check(cpu);	for_each_cpu(i, mask)		if (i != cpu)			break;	return i;} /* These are not inline because of header tangles. */#ifdef CONFIG_CPUMASK_OFFSTACK/** * 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. */bool alloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags, int node){	*mask = kmalloc_node(cpumask_size(), flags, node); #ifdef CONFIG_DEBUG_PER_CPU_MAPS	if (!*mask) {		printk(KERN_ERR "=> alloc_cpumask_var: failed!\n");		dump_stack();	}#endif	/* FIXME: Bandaid to save us from old primitives which go to NR_CPUS. */	if (*mask) {		unsigned char *ptr = (unsigned char *)cpumask_bits(*mask);		unsigned int tail;		tail = BITS_TO_LONGS(NR_CPUS - nr_cpumask_bits) * sizeof(long);		memset(ptr + cpumask_size() - tail, 0, tail);	} 	return *mask != NULL;}EXPORT_SYMBOL(alloc_cpumask_var_node); 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); /** * 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. */bool alloc_cpumask_var(cpumask_var_t *mask, gfp_t flags){	return alloc_cpumask_var_node(mask, flags, NUMA_NO_NODE);}EXPORT_SYMBOL(alloc_cpumask_var); bool zalloc_cpumask_var(cpumask_var_t *mask, gfp_t flags){	return alloc_cpumask_var(mask, flags | __GFP_ZERO);}EXPORT_SYMBOL(zalloc_cpumask_var); /** * 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 * a nop (in <linux/cpumask.h>). * Either returns an allocated (zero-filled) cpumask, or causes the * system to panic. */void __init alloc_bootmem_cpumask_var(cpumask_var_t *mask){	*mask = alloc_bootmem(cpumask_size());} /** * free_cpumask_var - frees memory allocated for a struct cpumask. * @mask: cpumask to free * * This is safe on a NULL mask. */void free_cpumask_var(cpumask_var_t mask){	kfree(mask);}EXPORT_SYMBOL(free_cpumask_var); /** * free_bootmem_cpumask_var - frees result of alloc_bootmem_cpumask_var * @mask: cpumask to free */void __init free_bootmem_cpumask_var(cpumask_var_t mask){	free_bootmem(__pa(mask), cpumask_size());}#endif