| /* Common code for 32 and 64-bit NUMA */ |
| #include <linux/topology.h> |
| #include <linux/module.h> |
| #include <linux/bootmem.h> |
| |
| #ifdef CONFIG_DEBUG_PER_CPU_MAPS |
| # define DBG(x...) printk(KERN_DEBUG x) |
| #else |
| # define DBG(x...) |
| #endif |
| |
| /* |
| * Which logical CPUs are on which nodes |
| */ |
| cpumask_var_t node_to_cpumask_map[MAX_NUMNODES]; |
| EXPORT_SYMBOL(node_to_cpumask_map); |
| |
| /* |
| * Allocate node_to_cpumask_map based on number of available nodes |
| * Requires node_possible_map to be valid. |
| * |
| * Note: node_to_cpumask() is not valid until after this is done. |
| * (Use CONFIG_DEBUG_PER_CPU_MAPS to check this.) |
| */ |
| void __init setup_node_to_cpumask_map(void) |
| { |
| unsigned int node, num = 0; |
| |
| /* setup nr_node_ids if not done yet */ |
| if (nr_node_ids == MAX_NUMNODES) { |
| for_each_node_mask(node, node_possible_map) |
| num = node; |
| nr_node_ids = num + 1; |
| } |
| |
| /* allocate the map */ |
| for (node = 0; node < nr_node_ids; node++) |
| alloc_bootmem_cpumask_var(&node_to_cpumask_map[node]); |
| |
| /* cpumask_of_node() will now work */ |
| pr_debug("Node to cpumask map for %d nodes\n", nr_node_ids); |
| } |
| |
| #ifdef CONFIG_DEBUG_PER_CPU_MAPS |
| /* |
| * Returns a pointer to the bitmask of CPUs on Node 'node'. |
| */ |
| const struct cpumask *cpumask_of_node(int node) |
| { |
| if (node >= nr_node_ids) { |
| printk(KERN_WARNING |
| "cpumask_of_node(%d): node > nr_node_ids(%d)\n", |
| node, nr_node_ids); |
| dump_stack(); |
| return cpu_none_mask; |
| } |
| if (node_to_cpumask_map[node] == NULL) { |
| printk(KERN_WARNING |
| "cpumask_of_node(%d): no node_to_cpumask_map!\n", |
| node); |
| dump_stack(); |
| return cpu_online_mask; |
| } |
| return node_to_cpumask_map[node]; |
| } |
| EXPORT_SYMBOL(cpumask_of_node); |
| #endif |