1 #include <linux/slab.h>
2 #include <linux/kernel.h>
3 #include <linux/bitops.h>
4 #include <linux/cpumask.h>
5 #include <linux/export.h>
6 #include <linux/bootmem.h>
9 * cpumask_next_and - get the next cpu in *src1p & *src2p
10 * @n: the cpu prior to the place to search (ie. return will be > @n)
11 * @src1p: the first cpumask pointer
12 * @src2p: the second cpumask pointer
14 * Returns >= nr_cpu_ids if no further cpus set in both.
16 int cpumask_next_and(int n, const struct cpumask *src1p,
17 const struct cpumask *src2p)
19 while ((n = cpumask_next(n, src1p)) < nr_cpu_ids)
20 if (cpumask_test_cpu(n, src2p))
24 EXPORT_SYMBOL(cpumask_next_and);
27 * cpumask_any_but - return a "random" in a cpumask, but not this one.
28 * @mask: the cpumask to search
29 * @cpu: the cpu to ignore.
31 * Often used to find any cpu but smp_processor_id() in a mask.
32 * Returns >= nr_cpu_ids if no cpus set.
34 int cpumask_any_but(const struct cpumask *mask, unsigned int cpu)
45 /* These are not inline because of header tangles. */
46 #ifdef CONFIG_CPUMASK_OFFSTACK
48 * alloc_cpumask_var_node - allocate a struct cpumask on a given node
49 * @mask: pointer to cpumask_var_t where the cpumask is returned
52 * Only defined when CONFIG_CPUMASK_OFFSTACK=y, otherwise is
53 * a nop returning a constant 1 (in <linux/cpumask.h>)
54 * Returns TRUE if memory allocation succeeded, FALSE otherwise.
56 * In addition, mask will be NULL if this fails. Note that gcc is
57 * usually smart enough to know that mask can never be NULL if
58 * CONFIG_CPUMASK_OFFSTACK=n, so does code elimination in that case
61 bool alloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags, int node)
63 *mask = kmalloc_node(cpumask_size(), flags, node);
65 #ifdef CONFIG_DEBUG_PER_CPU_MAPS
67 printk(KERN_ERR "=> alloc_cpumask_var: failed!\n");
74 EXPORT_SYMBOL(alloc_cpumask_var_node);
76 bool zalloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags, int node)
78 return alloc_cpumask_var_node(mask, flags | __GFP_ZERO, node);
80 EXPORT_SYMBOL(zalloc_cpumask_var_node);
83 * alloc_cpumask_var - allocate a struct cpumask
84 * @mask: pointer to cpumask_var_t where the cpumask is returned
87 * Only defined when CONFIG_CPUMASK_OFFSTACK=y, otherwise is
88 * a nop returning a constant 1 (in <linux/cpumask.h>).
90 * See alloc_cpumask_var_node.
92 bool alloc_cpumask_var(cpumask_var_t *mask, gfp_t flags)
94 return alloc_cpumask_var_node(mask, flags, NUMA_NO_NODE);
96 EXPORT_SYMBOL(alloc_cpumask_var);
98 bool zalloc_cpumask_var(cpumask_var_t *mask, gfp_t flags)
100 return alloc_cpumask_var(mask, flags | __GFP_ZERO);
102 EXPORT_SYMBOL(zalloc_cpumask_var);
105 * alloc_bootmem_cpumask_var - allocate a struct cpumask from the bootmem arena.
106 * @mask: pointer to cpumask_var_t where the cpumask is returned
108 * Only defined when CONFIG_CPUMASK_OFFSTACK=y, otherwise is
109 * a nop (in <linux/cpumask.h>).
110 * Either returns an allocated (zero-filled) cpumask, or causes the
113 void __init alloc_bootmem_cpumask_var(cpumask_var_t *mask)
115 *mask = memblock_virt_alloc(cpumask_size(), 0);
119 * free_cpumask_var - frees memory allocated for a struct cpumask.
120 * @mask: cpumask to free
122 * This is safe on a NULL mask.
124 void free_cpumask_var(cpumask_var_t mask)
128 EXPORT_SYMBOL(free_cpumask_var);
131 * free_bootmem_cpumask_var - frees result of alloc_bootmem_cpumask_var
132 * @mask: cpumask to free
134 void __init free_bootmem_cpumask_var(cpumask_var_t mask)
136 memblock_free_early(__pa(mask), cpumask_size());
141 * cpumask_local_spread - select the i'th cpu with local numa cpu's first
143 * @node: local numa_node
145 * This function selects an online CPU according to a numa aware policy;
146 * local cpus are returned first, followed by non-local ones, then it
149 * It's not very efficient, but useful for setup.
151 unsigned int cpumask_local_spread(unsigned int i, int node)
155 /* Wrap: we always want a cpu. */
156 i %= num_online_cpus();
159 for_each_cpu(cpu, cpu_online_mask)
164 for_each_cpu_and(cpu, cpumask_of_node(node), cpu_online_mask)
168 for_each_cpu(cpu, cpu_online_mask) {
169 /* Skip NUMA nodes, done above. */
170 if (cpumask_test_cpu(cpu, cpumask_of_node(node)))
179 EXPORT_SYMBOL(cpumask_local_spread);