1/* Common code for 32 and 64-bit NUMA */ 2#include <linux/topology.h> 3#include <linux/module.h> 4#include <linux/bootmem.h> 5 6/* 7 * Which logical CPUs are on which nodes 8 */ 9cpumask_var_t node_to_cpumask_map[MAX_NUMNODES]; 10EXPORT_SYMBOL(node_to_cpumask_map); 11 12/* 13 * Allocate node_to_cpumask_map based on number of available nodes 14 * Requires node_possible_map to be valid. 15 * 16 * Note: node_to_cpumask() is not valid until after this is done. 17 * (Use CONFIG_DEBUG_PER_CPU_MAPS to check this.) 18 */ 19void __init setup_node_to_cpumask_map(void) 20{ 21 unsigned int node, num = 0; 22 23 /* setup nr_node_ids if not done yet */ 24 if (nr_node_ids == MAX_NUMNODES) { 25 for_each_node_mask(node, node_possible_map) 26 num = node; 27 nr_node_ids = num + 1; 28 } 29 30 /* allocate the map */ 31 for (node = 0; node < nr_node_ids; node++) 32 alloc_bootmem_cpumask_var(&node_to_cpumask_map[node]); 33 34 /* cpumask_of_node() will now work */ 35 pr_debug("Node to cpumask map for %d nodes\n", nr_node_ids); 36} 37 38#ifdef CONFIG_DEBUG_PER_CPU_MAPS 39/* 40 * Returns a pointer to the bitmask of CPUs on Node 'node'. 41 */ 42const struct cpumask *cpumask_of_node(int node) 43{ 44 if (node >= nr_node_ids) { 45 printk(KERN_WARNING 46 "cpumask_of_node(%d): node > nr_node_ids(%d)\n", 47 node, nr_node_ids); 48 dump_stack(); 49 return cpu_none_mask; 50 } 51 if (node_to_cpumask_map[node] == NULL) { 52 printk(KERN_WARNING 53 "cpumask_of_node(%d): no node_to_cpumask_map!\n", 54 node); 55 dump_stack(); 56 return cpu_online_mask; 57 } 58 return node_to_cpumask_map[node]; 59} 60EXPORT_SYMBOL(cpumask_of_node); 61#endif 62