Andrew Morton | ccb4600 | 2006-03-25 03:08:08 -0800 | [diff] [blame] | 1 | #include <linux/kernel.h> |
| 2 | #include <linux/bitops.h> |
| 3 | #include <linux/cpumask.h> |
| 4 | #include <linux/module.h> |
Rusty Russell | 2d3854a | 2008-11-05 13:39:10 +1100 | [diff] [blame] | 5 | #include <linux/bootmem.h> |
Andrew Morton | ccb4600 | 2006-03-25 03:08:08 -0800 | [diff] [blame] | 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 | |
Andrew Morton | 3d18bd7 | 2006-03-25 03:08:09 -0800 | [diff] [blame] | 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); |
Andrew Morton | 8630282 | 2006-03-25 03:08:09 -0800 | [diff] [blame] | 18 | |
Mike Travis | 41df0d61 | 2008-05-12 21:21:13 +0200 | [diff] [blame] | 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 | |
Andrew Morton | 96a9b4d | 2006-03-25 03:08:10 -0800 | [diff] [blame] | 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); |
Rusty Russell | 2d3854a | 2008-11-05 13:39:10 +1100 | [diff] [blame] | 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 | |
Rusty Russell | 984f2f3 | 2008-11-08 20:24:19 +1100 | [diff] [blame] | 70 | cpumask_check(cpu); |
Rusty Russell | 2d3854a | 2008-11-05 13:39:10 +1100 | [diff] [blame] | 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 |
Mike Travis | ec26b80 | 2008-12-19 16:56:52 +1030 | [diff] [blame] | 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 | */ |
Mike Travis | 7b4967c | 2008-12-19 16:56:37 +1030 | [diff] [blame] | 93 | bool alloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags, int node) |
Rusty Russell | 2d3854a | 2008-11-05 13:39:10 +1100 | [diff] [blame] | 94 | { |
Yinghai Lu | 38c7fed | 2009-05-25 15:10:58 +0300 | [diff] [blame] | 95 | *mask = kmalloc_node(cpumask_size(), flags, node); |
| 96 | |
Rusty Russell | 2d3854a | 2008-11-05 13:39:10 +1100 | [diff] [blame] | 97 | #ifdef CONFIG_DEBUG_PER_CPU_MAPS |
| 98 | if (!*mask) { |
| 99 | printk(KERN_ERR "=> alloc_cpumask_var: failed!\n"); |
| 100 | dump_stack(); |
| 101 | } |
| 102 | #endif |
Rusty Russell | 2a53008 | 2009-01-01 10:12:30 +1030 | [diff] [blame] | 103 | /* FIXME: Bandaid to save us from old primitives which go to NR_CPUS. */ |
| 104 | if (*mask) { |
Jack Steiner | 4f032ac | 2009-04-02 16:59:48 -0700 | [diff] [blame] | 105 | unsigned char *ptr = (unsigned char *)cpumask_bits(*mask); |
Rusty Russell | 2a53008 | 2009-01-01 10:12:30 +1030 | [diff] [blame] | 106 | unsigned int tail; |
| 107 | tail = BITS_TO_LONGS(NR_CPUS - nr_cpumask_bits) * sizeof(long); |
Jack Steiner | 4f032ac | 2009-04-02 16:59:48 -0700 | [diff] [blame] | 108 | memset(ptr + cpumask_size() - tail, 0, tail); |
Rusty Russell | 2a53008 | 2009-01-01 10:12:30 +1030 | [diff] [blame] | 109 | } |
| 110 | |
Rusty Russell | 2d3854a | 2008-11-05 13:39:10 +1100 | [diff] [blame] | 111 | return *mask != NULL; |
| 112 | } |
Mike Travis | 7b4967c | 2008-12-19 16:56:37 +1030 | [diff] [blame] | 113 | EXPORT_SYMBOL(alloc_cpumask_var_node); |
| 114 | |
Yinghai Lu | 0281b5d | 2009-06-06 14:50:36 -0700 | [diff] [blame] | 115 | bool zalloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags, int node) |
| 116 | { |
| 117 | return alloc_cpumask_var_node(mask, flags | __GFP_ZERO, node); |
| 118 | } |
| 119 | EXPORT_SYMBOL(zalloc_cpumask_var_node); |
| 120 | |
Mike Travis | ec26b80 | 2008-12-19 16:56:52 +1030 | [diff] [blame] | 121 | /** |
| 122 | * alloc_cpumask_var - allocate a struct cpumask |
| 123 | * @mask: pointer to cpumask_var_t where the cpumask is returned |
| 124 | * @flags: GFP_ flags |
| 125 | * |
| 126 | * Only defined when CONFIG_CPUMASK_OFFSTACK=y, otherwise is |
| 127 | * a nop returning a constant 1 (in <linux/cpumask.h>). |
| 128 | * |
| 129 | * See alloc_cpumask_var_node. |
| 130 | */ |
Mike Travis | 7b4967c | 2008-12-19 16:56:37 +1030 | [diff] [blame] | 131 | bool alloc_cpumask_var(cpumask_var_t *mask, gfp_t flags) |
| 132 | { |
| 133 | return alloc_cpumask_var_node(mask, flags, numa_node_id()); |
| 134 | } |
Rusty Russell | 2d3854a | 2008-11-05 13:39:10 +1100 | [diff] [blame] | 135 | EXPORT_SYMBOL(alloc_cpumask_var); |
| 136 | |
Yinghai Lu | 0281b5d | 2009-06-06 14:50:36 -0700 | [diff] [blame] | 137 | bool zalloc_cpumask_var(cpumask_var_t *mask, gfp_t flags) |
| 138 | { |
| 139 | return alloc_cpumask_var(mask, flags | __GFP_ZERO); |
| 140 | } |
| 141 | EXPORT_SYMBOL(zalloc_cpumask_var); |
| 142 | |
Mike Travis | ec26b80 | 2008-12-19 16:56:52 +1030 | [diff] [blame] | 143 | /** |
| 144 | * alloc_bootmem_cpumask_var - allocate a struct cpumask from the bootmem arena. |
| 145 | * @mask: pointer to cpumask_var_t where the cpumask is returned |
| 146 | * |
| 147 | * Only defined when CONFIG_CPUMASK_OFFSTACK=y, otherwise is |
Li Zefan | e9690a6 | 2008-12-31 16:45:50 +0800 | [diff] [blame] | 148 | * a nop (in <linux/cpumask.h>). |
Mike Travis | ec26b80 | 2008-12-19 16:56:52 +1030 | [diff] [blame] | 149 | * Either returns an allocated (zero-filled) cpumask, or causes the |
| 150 | * system to panic. |
| 151 | */ |
Rusty Russell | 2d3854a | 2008-11-05 13:39:10 +1100 | [diff] [blame] | 152 | void __init alloc_bootmem_cpumask_var(cpumask_var_t *mask) |
| 153 | { |
| 154 | *mask = alloc_bootmem(cpumask_size()); |
| 155 | } |
| 156 | |
Mike Travis | ec26b80 | 2008-12-19 16:56:52 +1030 | [diff] [blame] | 157 | /** |
| 158 | * free_cpumask_var - frees memory allocated for a struct cpumask. |
| 159 | * @mask: cpumask to free |
| 160 | * |
| 161 | * This is safe on a NULL mask. |
| 162 | */ |
Rusty Russell | 2d3854a | 2008-11-05 13:39:10 +1100 | [diff] [blame] | 163 | void free_cpumask_var(cpumask_var_t mask) |
| 164 | { |
| 165 | kfree(mask); |
| 166 | } |
| 167 | EXPORT_SYMBOL(free_cpumask_var); |
Rusty Russell | cd83e42 | 2008-11-07 11:12:29 +1100 | [diff] [blame] | 168 | |
Mike Travis | ec26b80 | 2008-12-19 16:56:52 +1030 | [diff] [blame] | 169 | /** |
| 170 | * free_bootmem_cpumask_var - frees result of alloc_bootmem_cpumask_var |
| 171 | * @mask: cpumask to free |
| 172 | */ |
Rusty Russell | 984f2f3 | 2008-11-08 20:24:19 +1100 | [diff] [blame] | 173 | void __init free_bootmem_cpumask_var(cpumask_var_t mask) |
Rusty Russell | cd83e42 | 2008-11-07 11:12:29 +1100 | [diff] [blame] | 174 | { |
| 175 | free_bootmem((unsigned long)mask, cpumask_size()); |
| 176 | } |
Rusty Russell | 2d3854a | 2008-11-05 13:39:10 +1100 | [diff] [blame] | 177 | #endif |