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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/export.h>
  6 #include <linux/bootmem.h>
  7 
  8 /**
  9  * cpumask_next_and - get the next cpu in *src1p & *src2p
 10  * @n: the cpu prior to the place to search (ie. return will be > @n)
 11  * @src1p: the first cpumask pointer
 12  * @src2p: the second cpumask pointer
 13  *
 14  * Returns >= nr_cpu_ids if no further cpus set in both.
 15  */
 16 int cpumask_next_and(int n, const struct cpumask *src1p,
 17                      const struct cpumask *src2p)
 18 {
 19         while ((n = cpumask_next(n, src1p)) < nr_cpu_ids)
 20                 if (cpumask_test_cpu(n, src2p))
 21                         break;
 22         return n;
 23 }
 24 EXPORT_SYMBOL(cpumask_next_and);
 25 
 26 /**
 27  * cpumask_any_but - return a "random" in a cpumask, but not this one.
 28  * @mask: the cpumask to search
 29  * @cpu: the cpu to ignore.
 30  *
 31  * Often used to find any cpu but smp_processor_id() in a mask.
 32  * Returns >= nr_cpu_ids if no cpus set.
 33  */
 34 int cpumask_any_but(const struct cpumask *mask, unsigned int cpu)
 35 {
 36         unsigned int i;
 37 
 38         cpumask_check(cpu);
 39         for_each_cpu(i, mask)
 40                 if (i != cpu)
 41                         break;
 42         return i;
 43 }
 44 
 45 /* These are not inline because of header tangles. */
 46 #ifdef CONFIG_CPUMASK_OFFSTACK
 47 /**
 48  * alloc_cpumask_var_node - allocate a struct cpumask on a given node
 49  * @mask: pointer to cpumask_var_t where the cpumask is returned
 50  * @flags: GFP_ flags
 51  *
 52  * Only defined when CONFIG_CPUMASK_OFFSTACK=y, otherwise is
 53  * a nop returning a constant 1 (in <linux/cpumask.h>)
 54  * Returns TRUE if memory allocation succeeded, FALSE otherwise.
 55  *
 56  * In addition, mask will be NULL if this fails.  Note that gcc is
 57  * usually smart enough to know that mask can never be NULL if
 58  * CONFIG_CPUMASK_OFFSTACK=n, so does code elimination in that case
 59  * too.
 60  */
 61 bool alloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags, int node)
 62 {
 63         *mask = kmalloc_node(cpumask_size(), flags, node);
 64 
 65 #ifdef CONFIG_DEBUG_PER_CPU_MAPS
 66         if (!*mask) {
 67                 printk(KERN_ERR "=> alloc_cpumask_var: failed!\n");
 68                 dump_stack();
 69         }
 70 #endif
 71 
 72         return *mask != NULL;
 73 }
 74 EXPORT_SYMBOL(alloc_cpumask_var_node);
 75 
 76 bool zalloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags, int node)
 77 {
 78         return alloc_cpumask_var_node(mask, flags | __GFP_ZERO, node);
 79 }
 80 EXPORT_SYMBOL(zalloc_cpumask_var_node);
 81 
 82 /**
 83  * alloc_cpumask_var - allocate a struct cpumask
 84  * @mask: pointer to cpumask_var_t where the cpumask is returned
 85  * @flags: GFP_ flags
 86  *
 87  * Only defined when CONFIG_CPUMASK_OFFSTACK=y, otherwise is
 88  * a nop returning a constant 1 (in <linux/cpumask.h>).
 89  *
 90  * See alloc_cpumask_var_node.
 91  */
 92 bool alloc_cpumask_var(cpumask_var_t *mask, gfp_t flags)
 93 {
 94         return alloc_cpumask_var_node(mask, flags, NUMA_NO_NODE);
 95 }
 96 EXPORT_SYMBOL(alloc_cpumask_var);
 97 
 98 bool zalloc_cpumask_var(cpumask_var_t *mask, gfp_t flags)
 99 {
100         return alloc_cpumask_var(mask, flags | __GFP_ZERO);
101 }
102 EXPORT_SYMBOL(zalloc_cpumask_var);
103 
104 /**
105  * alloc_bootmem_cpumask_var - allocate a struct cpumask from the bootmem arena.
106  * @mask: pointer to cpumask_var_t where the cpumask is returned
107  *
108  * Only defined when CONFIG_CPUMASK_OFFSTACK=y, otherwise is
109  * a nop (in <linux/cpumask.h>).
110  * Either returns an allocated (zero-filled) cpumask, or causes the
111  * system to panic.
112  */
113 void __init alloc_bootmem_cpumask_var(cpumask_var_t *mask)
114 {
115         *mask = memblock_virt_alloc(cpumask_size(), 0);
116 }
117 
118 /**
119  * free_cpumask_var - frees memory allocated for a struct cpumask.
120  * @mask: cpumask to free
121  *
122  * This is safe on a NULL mask.
123  */
124 void free_cpumask_var(cpumask_var_t mask)
125 {
126         kfree(mask);
127 }
128 EXPORT_SYMBOL(free_cpumask_var);
129 
130 /**
131  * free_bootmem_cpumask_var - frees result of alloc_bootmem_cpumask_var
132  * @mask: cpumask to free
133  */
134 void __init free_bootmem_cpumask_var(cpumask_var_t mask)
135 {
136         memblock_free_early(__pa(mask), cpumask_size());
137 }
138 #endif
139 
140 /**
141  * cpumask_local_spread - select the i'th cpu with local numa cpu's first
142  * @i: index number
143  * @node: local numa_node
144  *
145  * This function selects an online CPU according to a numa aware policy;
146  * local cpus are returned first, followed by non-local ones, then it
147  * wraps around.
148  *
149  * It's not very efficient, but useful for setup.
150  */
151 unsigned int cpumask_local_spread(unsigned int i, int node)
152 {
153         int cpu;
154 
155         /* Wrap: we always want a cpu. */
156         i %= num_online_cpus();
157 
158         if (node == -1) {
159                 for_each_cpu(cpu, cpu_online_mask)
160                         if (i-- == 0)
161                                 return cpu;
162         } else {
163                 /* NUMA first. */
164                 for_each_cpu_and(cpu, cpumask_of_node(node), cpu_online_mask)
165                         if (i-- == 0)
166                                 return cpu;
167 
168                 for_each_cpu(cpu, cpu_online_mask) {
169                         /* Skip NUMA nodes, done above. */
170                         if (cpumask_test_cpu(cpu, cpumask_of_node(node)))
171                                 continue;
172 
173                         if (i-- == 0)
174                                 return cpu;
175                 }
176         }
177         BUG();
178 }
179 EXPORT_SYMBOL(cpumask_local_spread);
180 

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