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TOMOYO Linux Cross Reference
Linux/lib/cpumask.c

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  1 #include <linux/slab.h>
  2 #include <linux/kernel.h>
  3 #include <linux/bitops.h>
  4 #include <linux/cpumask.h>
  5 #include <linux/module.h>
  6 #include <linux/bootmem.h>
  7 
  8 int __first_cpu(const cpumask_t *srcp)
  9 {
 10         return min_t(int, NR_CPUS, find_first_bit(srcp->bits, NR_CPUS));
 11 }
 12 EXPORT_SYMBOL(__first_cpu);
 13 
 14 int __next_cpu(int n, const cpumask_t *srcp)
 15 {
 16         return min_t(int, NR_CPUS, find_next_bit(srcp->bits, NR_CPUS, n+1));
 17 }
 18 EXPORT_SYMBOL(__next_cpu);
 19 
 20 #if NR_CPUS > 64
 21 int __next_cpu_nr(int n, const cpumask_t *srcp)
 22 {
 23         return min_t(int, nr_cpu_ids,
 24                                 find_next_bit(srcp->bits, nr_cpu_ids, n+1));
 25 }
 26 EXPORT_SYMBOL(__next_cpu_nr);
 27 #endif
 28 
 29 int __any_online_cpu(const cpumask_t *mask)
 30 {
 31         int cpu;
 32 
 33         for_each_cpu_mask(cpu, *mask) {
 34                 if (cpu_online(cpu))
 35                         break;
 36         }
 37         return cpu;
 38 }
 39 EXPORT_SYMBOL(__any_online_cpu);
 40 
 41 /**
 42  * cpumask_next_and - get the next cpu in *src1p & *src2p
 43  * @n: the cpu prior to the place to search (ie. return will be > @n)
 44  * @src1p: the first cpumask pointer
 45  * @src2p: the second cpumask pointer
 46  *
 47  * Returns >= nr_cpu_ids if no further cpus set in both.
 48  */
 49 int cpumask_next_and(int n, const struct cpumask *src1p,
 50                      const struct cpumask *src2p)
 51 {
 52         while ((n = cpumask_next(n, src1p)) < nr_cpu_ids)
 53                 if (cpumask_test_cpu(n, src2p))
 54                         break;
 55         return n;
 56 }
 57 EXPORT_SYMBOL(cpumask_next_and);
 58 
 59 /**
 60  * cpumask_any_but - return a "random" in a cpumask, but not this one.
 61  * @mask: the cpumask to search
 62  * @cpu: the cpu to ignore.
 63  *
 64  * Often used to find any cpu but smp_processor_id() in a mask.
 65  * Returns >= nr_cpu_ids if no cpus set.
 66  */
 67 int cpumask_any_but(const struct cpumask *mask, unsigned int cpu)
 68 {
 69         unsigned int i;
 70 
 71         cpumask_check(cpu);
 72         for_each_cpu(i, mask)
 73                 if (i != cpu)
 74                         break;
 75         return i;
 76 }
 77 
 78 /* These are not inline because of header tangles. */
 79 #ifdef CONFIG_CPUMASK_OFFSTACK
 80 /**
 81  * alloc_cpumask_var_node - allocate a struct cpumask on a given node
 82  * @mask: pointer to cpumask_var_t where the cpumask is returned
 83  * @flags: GFP_ flags
 84  *
 85  * Only defined when CONFIG_CPUMASK_OFFSTACK=y, otherwise is
 86  * a nop returning a constant 1 (in <linux/cpumask.h>)
 87  * Returns TRUE if memory allocation succeeded, FALSE otherwise.
 88  *
 89  * In addition, mask will be NULL if this fails.  Note that gcc is
 90  * usually smart enough to know that mask can never be NULL if
 91  * CONFIG_CPUMASK_OFFSTACK=n, so does code elimination in that case
 92  * too.
 93  */
 94 bool alloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags, int node)
 95 {
 96         *mask = kmalloc_node(cpumask_size(), flags, node);
 97 
 98 #ifdef CONFIG_DEBUG_PER_CPU_MAPS
 99         if (!*mask) {
100                 printk(KERN_ERR "=> alloc_cpumask_var: failed!\n");
101                 dump_stack();
102         }
103 #endif
104         /* FIXME: Bandaid to save us from old primitives which go to NR_CPUS. */
105         if (*mask) {
106                 unsigned char *ptr = (unsigned char *)cpumask_bits(*mask);
107                 unsigned int tail;
108                 tail = BITS_TO_LONGS(NR_CPUS - nr_cpumask_bits) * sizeof(long);
109                 memset(ptr + cpumask_size() - tail, 0, tail);
110         }
111 
112         return *mask != NULL;
113 }
114 EXPORT_SYMBOL(alloc_cpumask_var_node);
115 
116 bool zalloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags, int node)
117 {
118         return alloc_cpumask_var_node(mask, flags | __GFP_ZERO, node);
119 }
120 EXPORT_SYMBOL(zalloc_cpumask_var_node);
121 
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  */
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 }
136 EXPORT_SYMBOL(alloc_cpumask_var);
137 
138 bool zalloc_cpumask_var(cpumask_var_t *mask, gfp_t flags)
139 {
140         return alloc_cpumask_var(mask, flags | __GFP_ZERO);
141 }
142 EXPORT_SYMBOL(zalloc_cpumask_var);
143 
144 /**
145  * alloc_bootmem_cpumask_var - allocate a struct cpumask from the bootmem arena.
146  * @mask: pointer to cpumask_var_t where the cpumask is returned
147  *
148  * Only defined when CONFIG_CPUMASK_OFFSTACK=y, otherwise is
149  * a nop (in <linux/cpumask.h>).
150  * Either returns an allocated (zero-filled) cpumask, or causes the
151  * system to panic.
152  */
153 void __init alloc_bootmem_cpumask_var(cpumask_var_t *mask)
154 {
155         *mask = alloc_bootmem(cpumask_size());
156 }
157 
158 /**
159  * free_cpumask_var - frees memory allocated for a struct cpumask.
160  * @mask: cpumask to free
161  *
162  * This is safe on a NULL mask.
163  */
164 void free_cpumask_var(cpumask_var_t mask)
165 {
166         kfree(mask);
167 }
168 EXPORT_SYMBOL(free_cpumask_var);
169 
170 /**
171  * free_bootmem_cpumask_var - frees result of alloc_bootmem_cpumask_var
172  * @mask: cpumask to free
173  */
174 void __init free_bootmem_cpumask_var(cpumask_var_t mask)
175 {
176         free_bootmem((unsigned long)mask, cpumask_size());
177 }
178 #endif
179 

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