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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 | ||
70 | for_each_cpu(i, mask) | |
71 | if (i != cpu) | |
72 | break; | |
73 | return i; | |
74 | } | |
75 | ||
76 | /* These are not inline because of header tangles. */ | |
77 | #ifdef CONFIG_CPUMASK_OFFSTACK | |
78 | bool alloc_cpumask_var(cpumask_var_t *mask, gfp_t flags) | |
79 | { | |
80 | if (likely(slab_is_available())) | |
81 | *mask = kmalloc(cpumask_size(), flags); | |
82 | else { | |
83 | #ifdef CONFIG_DEBUG_PER_CPU_MAPS | |
84 | printk(KERN_ERR | |
85 | "=> alloc_cpumask_var: kmalloc not available!\n"); | |
86 | dump_stack(); | |
87 | #endif | |
88 | *mask = NULL; | |
89 | } | |
90 | #ifdef CONFIG_DEBUG_PER_CPU_MAPS | |
91 | if (!*mask) { | |
92 | printk(KERN_ERR "=> alloc_cpumask_var: failed!\n"); | |
93 | dump_stack(); | |
94 | } | |
95 | #endif | |
96 | return *mask != NULL; | |
97 | } | |
98 | EXPORT_SYMBOL(alloc_cpumask_var); | |
99 | ||
100 | void __init alloc_bootmem_cpumask_var(cpumask_var_t *mask) | |
101 | { | |
102 | *mask = alloc_bootmem(cpumask_size()); | |
103 | } | |
104 | ||
105 | void free_cpumask_var(cpumask_var_t mask) | |
106 | { | |
107 | kfree(mask); | |
108 | } | |
109 | EXPORT_SYMBOL(free_cpumask_var); | |
110 | #endif |