1 #include <linux/kernel.h>
2 #include <linux/bitops.h>
3 #include <linux/cpumask.h>
4 #include <linux/module.h>
5 #include <linux/bootmem.h>
7 int __first_cpu(const cpumask_t
*srcp
)
9 return min_t(int, NR_CPUS
, find_first_bit(srcp
->bits
, NR_CPUS
));
11 EXPORT_SYMBOL(__first_cpu
);
13 int __next_cpu(int n
, const cpumask_t
*srcp
)
15 return min_t(int, NR_CPUS
, find_next_bit(srcp
->bits
, NR_CPUS
, n
+1));
17 EXPORT_SYMBOL(__next_cpu
);
20 int __next_cpu_nr(int n
, const cpumask_t
*srcp
)
22 return min_t(int, nr_cpu_ids
,
23 find_next_bit(srcp
->bits
, nr_cpu_ids
, n
+1));
25 EXPORT_SYMBOL(__next_cpu_nr
);
28 int __any_online_cpu(const cpumask_t
*mask
)
32 for_each_cpu_mask(cpu
, *mask
) {
38 EXPORT_SYMBOL(__any_online_cpu
);
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
46 * Returns >= nr_cpu_ids if no further cpus set in both.
48 int cpumask_next_and(int n
, const struct cpumask
*src1p
,
49 const struct cpumask
*src2p
)
51 while ((n
= cpumask_next(n
, src1p
)) < nr_cpu_ids
)
52 if (cpumask_test_cpu(n
, src2p
))
56 EXPORT_SYMBOL(cpumask_next_and
);
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.
63 * Often used to find any cpu but smp_processor_id() in a mask.
64 * Returns >= nr_cpu_ids if no cpus set.
66 int cpumask_any_but(const struct cpumask
*mask
, unsigned int cpu
)
77 /* These are not inline because of header tangles. */
78 #ifdef CONFIG_CPUMASK_OFFSTACK
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
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.
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
93 bool alloc_cpumask_var_node(cpumask_var_t
*mask
, gfp_t flags
, int node
)
95 if (likely(slab_is_available()))
96 *mask
= kmalloc_node(cpumask_size(), flags
, node
);
98 #ifdef CONFIG_DEBUG_PER_CPU_MAPS
100 "=> alloc_cpumask_var: kmalloc not available!\n");
104 #ifdef CONFIG_DEBUG_PER_CPU_MAPS
106 printk(KERN_ERR
"=> alloc_cpumask_var: failed!\n");
110 /* FIXME: Bandaid to save us from old primitives which go to NR_CPUS. */
112 unsigned char *ptr
= (unsigned char *)cpumask_bits(*mask
);
114 tail
= BITS_TO_LONGS(NR_CPUS
- nr_cpumask_bits
) * sizeof(long);
115 memset(ptr
+ cpumask_size() - tail
, 0, tail
);
118 return *mask
!= NULL
;
120 EXPORT_SYMBOL(alloc_cpumask_var_node
);
123 * alloc_cpumask_var - allocate a struct cpumask
124 * @mask: pointer to cpumask_var_t where the cpumask is returned
127 * Only defined when CONFIG_CPUMASK_OFFSTACK=y, otherwise is
128 * a nop returning a constant 1 (in <linux/cpumask.h>).
130 * See alloc_cpumask_var_node.
132 bool alloc_cpumask_var(cpumask_var_t
*mask
, gfp_t flags
)
134 return alloc_cpumask_var_node(mask
, flags
, numa_node_id());
136 EXPORT_SYMBOL(alloc_cpumask_var
);
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
142 * Only defined when CONFIG_CPUMASK_OFFSTACK=y, otherwise is
143 * a nop (in <linux/cpumask.h>).
144 * Either returns an allocated (zero-filled) cpumask, or causes the
147 void __init
alloc_bootmem_cpumask_var(cpumask_var_t
*mask
)
149 *mask
= alloc_bootmem(cpumask_size());
153 * free_cpumask_var - frees memory allocated for a struct cpumask.
154 * @mask: cpumask to free
156 * This is safe on a NULL mask.
158 void free_cpumask_var(cpumask_var_t mask
)
162 EXPORT_SYMBOL(free_cpumask_var
);
165 * free_bootmem_cpumask_var - frees result of alloc_bootmem_cpumask_var
166 * @mask: cpumask to free
168 void __init
free_bootmem_cpumask_var(cpumask_var_t mask
)
170 free_bootmem((unsigned long)mask
, cpumask_size());
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