blob: 7bb4142a502f3a8ceb57fb9e24d24d8bfe81332d [file] [log] [blame]
Andrew Mortonccb46002006-03-25 03:08:08 -08001#include <linux/kernel.h>
2#include <linux/bitops.h>
3#include <linux/cpumask.h>
4#include <linux/module.h>
Rusty Russell2d3854a2008-11-05 13:39:10 +11005#include <linux/bootmem.h>
Andrew Mortonccb46002006-03-25 03:08:08 -08006
7int __first_cpu(const cpumask_t *srcp)
8{
9 return min_t(int, NR_CPUS, find_first_bit(srcp->bits, NR_CPUS));
10}
11EXPORT_SYMBOL(__first_cpu);
12
Andrew Morton3d18bd72006-03-25 03:08:09 -080013int __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}
17EXPORT_SYMBOL(__next_cpu);
Andrew Morton86302822006-03-25 03:08:09 -080018
Mike Travis41df0d612008-05-12 21:21:13 +020019#if NR_CPUS > 64
20int __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}
25EXPORT_SYMBOL(__next_cpu_nr);
26#endif
27
Andrew Morton96a9b4d2006-03-25 03:08:10 -080028int __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}
38EXPORT_SYMBOL(__any_online_cpu);
Rusty Russell2d3854a2008-11-05 13:39:10 +110039
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 */
48int 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}
56EXPORT_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 */
66int cpumask_any_but(const struct cpumask *mask, unsigned int cpu)
67{
68 unsigned int i;
69
Rusty Russell984f2f32008-11-08 20:24:19 +110070 cpumask_check(cpu);
Rusty Russell2d3854a2008-11-05 13:39:10 +110071 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 Travisec26b802008-12-19 16:56:52 +103079/**
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 Travis7b4967c2008-12-19 16:56:37 +103093bool alloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags, int node)
Rusty Russell2d3854a2008-11-05 13:39:10 +110094{
Yinghai Lu38c7fed2009-05-25 15:10:58 +030095 *mask = kmalloc_node(cpumask_size(), flags, node);
96
Rusty Russell2d3854a2008-11-05 13:39:10 +110097#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 Russell2a530082009-01-01 10:12:30 +1030103 /* FIXME: Bandaid to save us from old primitives which go to NR_CPUS. */
104 if (*mask) {
Jack Steiner4f032ac2009-04-02 16:59:48 -0700105 unsigned char *ptr = (unsigned char *)cpumask_bits(*mask);
Rusty Russell2a530082009-01-01 10:12:30 +1030106 unsigned int tail;
107 tail = BITS_TO_LONGS(NR_CPUS - nr_cpumask_bits) * sizeof(long);
Jack Steiner4f032ac2009-04-02 16:59:48 -0700108 memset(ptr + cpumask_size() - tail, 0, tail);
Rusty Russell2a530082009-01-01 10:12:30 +1030109 }
110
Rusty Russell2d3854a2008-11-05 13:39:10 +1100111 return *mask != NULL;
112}
Mike Travis7b4967c2008-12-19 16:56:37 +1030113EXPORT_SYMBOL(alloc_cpumask_var_node);
114
Yinghai Lu0281b5d2009-06-06 14:50:36 -0700115bool 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}
119EXPORT_SYMBOL(zalloc_cpumask_var_node);
120
Mike Travisec26b802008-12-19 16:56:52 +1030121/**
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 Travis7b4967c2008-12-19 16:56:37 +1030131bool alloc_cpumask_var(cpumask_var_t *mask, gfp_t flags)
132{
133 return alloc_cpumask_var_node(mask, flags, numa_node_id());
134}
Rusty Russell2d3854a2008-11-05 13:39:10 +1100135EXPORT_SYMBOL(alloc_cpumask_var);
136
Yinghai Lu0281b5d2009-06-06 14:50:36 -0700137bool zalloc_cpumask_var(cpumask_var_t *mask, gfp_t flags)
138{
139 return alloc_cpumask_var(mask, flags | __GFP_ZERO);
140}
141EXPORT_SYMBOL(zalloc_cpumask_var);
142
Mike Travisec26b802008-12-19 16:56:52 +1030143/**
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 Zefane9690a62008-12-31 16:45:50 +0800148 * a nop (in <linux/cpumask.h>).
Mike Travisec26b802008-12-19 16:56:52 +1030149 * Either returns an allocated (zero-filled) cpumask, or causes the
150 * system to panic.
151 */
Rusty Russell2d3854a2008-11-05 13:39:10 +1100152void __init alloc_bootmem_cpumask_var(cpumask_var_t *mask)
153{
154 *mask = alloc_bootmem(cpumask_size());
155}
156
Mike Travisec26b802008-12-19 16:56:52 +1030157/**
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 Russell2d3854a2008-11-05 13:39:10 +1100163void free_cpumask_var(cpumask_var_t mask)
164{
165 kfree(mask);
166}
167EXPORT_SYMBOL(free_cpumask_var);
Rusty Russellcd83e422008-11-07 11:12:29 +1100168
Mike Travisec26b802008-12-19 16:56:52 +1030169/**
170 * free_bootmem_cpumask_var - frees result of alloc_bootmem_cpumask_var
171 * @mask: cpumask to free
172 */
Rusty Russell984f2f32008-11-08 20:24:19 +1100173void __init free_bootmem_cpumask_var(cpumask_var_t mask)
Rusty Russellcd83e422008-11-07 11:12:29 +1100174{
175 free_bootmem((unsigned long)mask, cpumask_size());
176}
Rusty Russell2d3854a2008-11-05 13:39:10 +1100177#endif