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