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ccb46000 AM |
1 | #include <linux/kernel.h> |
2 | #include <linux/bitops.h> | |
3 | #include <linux/cpumask.h> | |
4 | #include <linux/module.h> | |
2d3854a3 | 5 | #include <linux/bootmem.h> |
ccb46000 AM |
6 | |
7 | int __first_cpu(const cpumask_t *srcp) | |
8 | { | |
9 | return min_t(int, NR_CPUS, find_first_bit(srcp->bits, NR_CPUS)); | |
10 | } | |
11 | EXPORT_SYMBOL(__first_cpu); | |
12 | ||
3d18bd74 AM |
13 | int __next_cpu(int n, const cpumask_t *srcp) |
14 | { | |
15 | return min_t(int, NR_CPUS, find_next_bit(srcp->bits, NR_CPUS, n+1)); | |
16 | } | |
17 | EXPORT_SYMBOL(__next_cpu); | |
86302820 | 18 | |
41df0d61 MT |
19 | #if NR_CPUS > 64 |
20 | int __next_cpu_nr(int n, const cpumask_t *srcp) | |
21 | { | |
22 | return min_t(int, nr_cpu_ids, | |
23 | find_next_bit(srcp->bits, nr_cpu_ids, n+1)); | |
24 | } | |
25 | EXPORT_SYMBOL(__next_cpu_nr); | |
26 | #endif | |
27 | ||
96a9b4d3 AM |
28 | int __any_online_cpu(const cpumask_t *mask) |
29 | { | |
30 | int cpu; | |
31 | ||
32 | for_each_cpu_mask(cpu, *mask) { | |
33 | if (cpu_online(cpu)) | |
34 | break; | |
35 | } | |
36 | return cpu; | |
37 | } | |
38 | EXPORT_SYMBOL(__any_online_cpu); | |
2d3854a3 RR |
39 | |
40 | /** | |
41 | * cpumask_next_and - get the next cpu in *src1p & *src2p | |
42 | * @n: the cpu prior to the place to search (ie. return will be > @n) | |
43 | * @src1p: the first cpumask pointer | |
44 | * @src2p: the second cpumask pointer | |
45 | * | |
46 | * Returns >= nr_cpu_ids if no further cpus set in both. | |
47 | */ | |
48 | int cpumask_next_and(int n, const struct cpumask *src1p, | |
49 | const struct cpumask *src2p) | |
50 | { | |
51 | while ((n = cpumask_next(n, src1p)) < nr_cpu_ids) | |
52 | if (cpumask_test_cpu(n, src2p)) | |
53 | break; | |
54 | return n; | |
55 | } | |
56 | EXPORT_SYMBOL(cpumask_next_and); | |
57 | ||
58 | /** | |
59 | * cpumask_any_but - return a "random" in a cpumask, but not this one. | |
60 | * @mask: the cpumask to search | |
61 | * @cpu: the cpu to ignore. | |
62 | * | |
63 | * Often used to find any cpu but smp_processor_id() in a mask. | |
64 | * Returns >= nr_cpu_ids if no cpus set. | |
65 | */ | |
66 | int cpumask_any_but(const struct cpumask *mask, unsigned int cpu) | |
67 | { | |
68 | unsigned int i; | |
69 | ||
984f2f37 | 70 | cpumask_check(cpu); |
2d3854a3 RR |
71 | for_each_cpu(i, mask) |
72 | if (i != cpu) | |
73 | break; | |
74 | return i; | |
75 | } | |
76 | ||
77 | /* These are not inline because of header tangles. */ | |
78 | #ifdef CONFIG_CPUMASK_OFFSTACK | |
ec26b805 MT |
79 | /** |
80 | * alloc_cpumask_var_node - allocate a struct cpumask on a given node | |
81 | * @mask: pointer to cpumask_var_t where the cpumask is returned | |
82 | * @flags: GFP_ flags | |
83 | * | |
84 | * Only defined when CONFIG_CPUMASK_OFFSTACK=y, otherwise is | |
85 | * a nop returning a constant 1 (in <linux/cpumask.h>) | |
86 | * Returns TRUE if memory allocation succeeded, FALSE otherwise. | |
87 | * | |
88 | * In addition, mask will be NULL if this fails. Note that gcc is | |
89 | * usually smart enough to know that mask can never be NULL if | |
90 | * CONFIG_CPUMASK_OFFSTACK=n, so does code elimination in that case | |
91 | * too. | |
92 | */ | |
7b4967c5 | 93 | bool alloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags, int node) |
2d3854a3 RR |
94 | { |
95 | if (likely(slab_is_available())) | |
7b4967c5 | 96 | *mask = kmalloc_node(cpumask_size(), flags, node); |
2d3854a3 RR |
97 | else { |
98 | #ifdef CONFIG_DEBUG_PER_CPU_MAPS | |
99 | printk(KERN_ERR | |
100 | "=> alloc_cpumask_var: kmalloc not available!\n"); | |
2d3854a3 RR |
101 | #endif |
102 | *mask = NULL; | |
103 | } | |
104 | #ifdef CONFIG_DEBUG_PER_CPU_MAPS | |
105 | if (!*mask) { | |
106 | printk(KERN_ERR "=> alloc_cpumask_var: failed!\n"); | |
107 | dump_stack(); | |
108 | } | |
109 | #endif | |
2a530080 RR |
110 | /* FIXME: Bandaid to save us from old primitives which go to NR_CPUS. */ |
111 | if (*mask) { | |
112 | unsigned int tail; | |
113 | tail = BITS_TO_LONGS(NR_CPUS - nr_cpumask_bits) * sizeof(long); | |
114 | memset(cpumask_bits(*mask) + cpumask_size() - tail, | |
115 | 0, tail); | |
116 | } | |
117 | ||
2d3854a3 RR |
118 | return *mask != NULL; |
119 | } | |
7b4967c5 MT |
120 | EXPORT_SYMBOL(alloc_cpumask_var_node); |
121 | ||
ec26b805 MT |
122 | /** |
123 | * alloc_cpumask_var - allocate a struct cpumask | |
124 | * @mask: pointer to cpumask_var_t where the cpumask is returned | |
125 | * @flags: GFP_ flags | |
126 | * | |
127 | * Only defined when CONFIG_CPUMASK_OFFSTACK=y, otherwise is | |
128 | * a nop returning a constant 1 (in <linux/cpumask.h>). | |
129 | * | |
130 | * See alloc_cpumask_var_node. | |
131 | */ | |
7b4967c5 MT |
132 | bool alloc_cpumask_var(cpumask_var_t *mask, gfp_t flags) |
133 | { | |
134 | return alloc_cpumask_var_node(mask, flags, numa_node_id()); | |
135 | } | |
2d3854a3 RR |
136 | EXPORT_SYMBOL(alloc_cpumask_var); |
137 | ||
ec26b805 MT |
138 | /** |
139 | * alloc_bootmem_cpumask_var - allocate a struct cpumask from the bootmem arena. | |
140 | * @mask: pointer to cpumask_var_t where the cpumask is returned | |
141 | * | |
142 | * Only defined when CONFIG_CPUMASK_OFFSTACK=y, otherwise is | |
e9690a6e | 143 | * a nop (in <linux/cpumask.h>). |
ec26b805 MT |
144 | * Either returns an allocated (zero-filled) cpumask, or causes the |
145 | * system to panic. | |
146 | */ | |
2d3854a3 RR |
147 | void __init alloc_bootmem_cpumask_var(cpumask_var_t *mask) |
148 | { | |
149 | *mask = alloc_bootmem(cpumask_size()); | |
150 | } | |
151 | ||
ec26b805 MT |
152 | /** |
153 | * free_cpumask_var - frees memory allocated for a struct cpumask. | |
154 | * @mask: cpumask to free | |
155 | * | |
156 | * This is safe on a NULL mask. | |
157 | */ | |
2d3854a3 RR |
158 | void free_cpumask_var(cpumask_var_t mask) |
159 | { | |
160 | kfree(mask); | |
161 | } | |
162 | EXPORT_SYMBOL(free_cpumask_var); | |
cd83e42c | 163 | |
ec26b805 MT |
164 | /** |
165 | * free_bootmem_cpumask_var - frees result of alloc_bootmem_cpumask_var | |
166 | * @mask: cpumask to free | |
167 | */ | |
984f2f37 | 168 | void __init free_bootmem_cpumask_var(cpumask_var_t mask) |
cd83e42c RR |
169 | { |
170 | free_bootmem((unsigned long)mask, cpumask_size()); | |
171 | } | |
2d3854a3 | 172 | #endif |