1 #include <linux/slab.h>
2 #include <linux/kernel.h>
3 #include <linux/bitops.h>
4 #include <linux/cpumask.h>
5 #include <linux/module.h>
6 #include <linux/bootmem.h>
8 int __first_cpu(const cpumask_t *srcp)
10 return min_t(int, NR_CPUS, find_first_bit(srcp->bits, NR_CPUS));
12 EXPORT_SYMBOL(__first_cpu);
14 int __next_cpu(int n, const cpumask_t *srcp)
16 return min_t(int, NR_CPUS, find_next_bit(srcp->bits, NR_CPUS, n+1));
18 EXPORT_SYMBOL(__next_cpu);
21 int __next_cpu_nr(int n, const cpumask_t *srcp)
23 return min_t(int, nr_cpu_ids,
24 find_next_bit(srcp->bits, nr_cpu_ids, n+1));
26 EXPORT_SYMBOL(__next_cpu_nr);
29 int __any_online_cpu(const cpumask_t *mask)
33 for_each_cpu(cpu, mask) {
39 EXPORT_SYMBOL(__any_online_cpu);
42 * cpumask_next_and - get the next cpu in *src1p & *src2p
43 * @n: the cpu prior to the place to search (ie. return will be > @n)
44 * @src1p: the first cpumask pointer
45 * @src2p: the second cpumask pointer
47 * Returns >= nr_cpu_ids if no further cpus set in both.
49 int cpumask_next_and(int n, const struct cpumask *src1p,
50 const struct cpumask *src2p)
52 while ((n = cpumask_next(n, src1p)) < nr_cpu_ids)
53 if (cpumask_test_cpu(n, src2p))
57 EXPORT_SYMBOL(cpumask_next_and);
60 * cpumask_any_but - return a "random" in a cpumask, but not this one.
61 * @mask: the cpumask to search
62 * @cpu: the cpu to ignore.
64 * Often used to find any cpu but smp_processor_id() in a mask.
65 * Returns >= nr_cpu_ids if no cpus set.
67 int cpumask_any_but(const struct cpumask *mask, unsigned int cpu)
79 * cpumask_next_wrap - helper to implement for_each_cpu_wrap
80 * @n: the cpu prior to the place to search
81 * @mask: the cpumask pointer
82 * @start: the start point of the iteration
83 * @wrap: assume @n crossing @start terminates the iteration
85 * Returns >= nr_cpu_ids on completion
87 * Note: the @wrap argument is required for the start condition when
88 * we cannot assume @start is set in @mask.
90 int cpumask_next_wrap(int n, const struct cpumask *mask, int start, bool wrap)
95 next = cpumask_next(n, mask);
97 if (wrap && n < start && next >= start) {
98 return nr_cpumask_bits;
100 } else if (next >= nr_cpumask_bits) {
108 EXPORT_SYMBOL(cpumask_next_wrap);
110 /* These are not inline because of header tangles. */
111 #ifdef CONFIG_CPUMASK_OFFSTACK
113 * alloc_cpumask_var_node - allocate a struct cpumask on a given node
114 * @mask: pointer to cpumask_var_t where the cpumask is returned
117 * Only defined when CONFIG_CPUMASK_OFFSTACK=y, otherwise is
118 * a nop returning a constant 1 (in <linux/cpumask.h>)
119 * Returns TRUE if memory allocation succeeded, FALSE otherwise.
121 * In addition, mask will be NULL if this fails. Note that gcc is
122 * usually smart enough to know that mask can never be NULL if
123 * CONFIG_CPUMASK_OFFSTACK=n, so does code elimination in that case
126 bool alloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags, int node)
128 *mask = kmalloc_node(cpumask_size(), flags, node);
130 #ifdef CONFIG_DEBUG_PER_CPU_MAPS
132 printk(KERN_ERR "=> alloc_cpumask_var: failed!\n");
136 /* FIXME: Bandaid to save us from old primitives which go to NR_CPUS. */
138 unsigned char *ptr = (unsigned char *)cpumask_bits(*mask);
140 tail = BITS_TO_LONGS(NR_CPUS - nr_cpumask_bits) * sizeof(long);
141 memset(ptr + cpumask_size() - tail, 0, tail);
144 return *mask != NULL;
146 EXPORT_SYMBOL(alloc_cpumask_var_node);
148 bool zalloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags, int node)
150 return alloc_cpumask_var_node(mask, flags | __GFP_ZERO, node);
152 EXPORT_SYMBOL(zalloc_cpumask_var_node);
155 * alloc_cpumask_var - allocate a struct cpumask
156 * @mask: pointer to cpumask_var_t where the cpumask is returned
159 * Only defined when CONFIG_CPUMASK_OFFSTACK=y, otherwise is
160 * a nop returning a constant 1 (in <linux/cpumask.h>).
162 * See alloc_cpumask_var_node.
164 bool alloc_cpumask_var(cpumask_var_t *mask, gfp_t flags)
166 return alloc_cpumask_var_node(mask, flags, NUMA_NO_NODE);
168 EXPORT_SYMBOL(alloc_cpumask_var);
170 bool zalloc_cpumask_var(cpumask_var_t *mask, gfp_t flags)
172 return alloc_cpumask_var(mask, flags | __GFP_ZERO);
174 EXPORT_SYMBOL(zalloc_cpumask_var);
177 * alloc_bootmem_cpumask_var - allocate a struct cpumask from the bootmem arena.
178 * @mask: pointer to cpumask_var_t where the cpumask is returned
180 * Only defined when CONFIG_CPUMASK_OFFSTACK=y, otherwise is
181 * a nop (in <linux/cpumask.h>).
182 * Either returns an allocated (zero-filled) cpumask, or causes the
185 void __init alloc_bootmem_cpumask_var(cpumask_var_t *mask)
187 *mask = alloc_bootmem(cpumask_size());
191 * free_cpumask_var - frees memory allocated for a struct cpumask.
192 * @mask: cpumask to free
194 * This is safe on a NULL mask.
196 void free_cpumask_var(cpumask_var_t mask)
200 EXPORT_SYMBOL(free_cpumask_var);
203 * free_bootmem_cpumask_var - frees result of alloc_bootmem_cpumask_var
204 * @mask: cpumask to free
206 void __init free_bootmem_cpumask_var(cpumask_var_t mask)
208 free_bootmem((unsigned long)mask, cpumask_size());