| #include <linux/kernel.h> |
| #include <linux/bitops.h> |
| #include <linux/cpumask.h> |
| #include <linux/module.h> |
| #include <linux/bootmem.h> |
| |
| int __first_cpu(const cpumask_t *srcp) |
| { |
| return min_t(int, NR_CPUS, find_first_bit(srcp->bits, NR_CPUS)); |
| } |
| EXPORT_SYMBOL(__first_cpu); |
| |
| int __next_cpu(int n, const cpumask_t *srcp) |
| { |
| return min_t(int, NR_CPUS, find_next_bit(srcp->bits, NR_CPUS, n+1)); |
| } |
| EXPORT_SYMBOL(__next_cpu); |
| |
| #if NR_CPUS > 64 |
| int __next_cpu_nr(int n, const cpumask_t *srcp) |
| { |
| return min_t(int, nr_cpu_ids, |
| find_next_bit(srcp->bits, nr_cpu_ids, n+1)); |
| } |
| EXPORT_SYMBOL(__next_cpu_nr); |
| #endif |
| |
| int __any_online_cpu(const cpumask_t *mask) |
| { |
| int cpu; |
| |
| for_each_cpu_mask(cpu, *mask) { |
| if (cpu_online(cpu)) |
| break; |
| } |
| return cpu; |
| } |
| EXPORT_SYMBOL(__any_online_cpu); |
| |
| /** |
| * cpumask_next_and - get the next cpu in *src1p & *src2p |
| * @n: the cpu prior to the place to search (ie. return will be > @n) |
| * @src1p: the first cpumask pointer |
| * @src2p: the second cpumask pointer |
| * |
| * Returns >= nr_cpu_ids if no further cpus set in both. |
| */ |
| int cpumask_next_and(int n, const struct cpumask *src1p, |
| const struct cpumask *src2p) |
| { |
| while ((n = cpumask_next(n, src1p)) < nr_cpu_ids) |
| if (cpumask_test_cpu(n, src2p)) |
| break; |
| return n; |
| } |
| EXPORT_SYMBOL(cpumask_next_and); |
| |
| /** |
| * cpumask_any_but - return a "random" in a cpumask, but not this one. |
| * @mask: the cpumask to search |
| * @cpu: the cpu to ignore. |
| * |
| * Often used to find any cpu but smp_processor_id() in a mask. |
| * Returns >= nr_cpu_ids if no cpus set. |
| */ |
| int cpumask_any_but(const struct cpumask *mask, unsigned int cpu) |
| { |
| unsigned int i; |
| |
| for_each_cpu(i, mask) |
| if (i != cpu) |
| break; |
| return i; |
| } |
| |
| /* These are not inline because of header tangles. */ |
| #ifdef CONFIG_CPUMASK_OFFSTACK |
| bool alloc_cpumask_var(cpumask_var_t *mask, gfp_t flags) |
| { |
| if (likely(slab_is_available())) |
| *mask = kmalloc(cpumask_size(), flags); |
| else { |
| #ifdef CONFIG_DEBUG_PER_CPU_MAPS |
| printk(KERN_ERR |
| "=> alloc_cpumask_var: kmalloc not available!\n"); |
| dump_stack(); |
| #endif |
| *mask = NULL; |
| } |
| #ifdef CONFIG_DEBUG_PER_CPU_MAPS |
| if (!*mask) { |
| printk(KERN_ERR "=> alloc_cpumask_var: failed!\n"); |
| dump_stack(); |
| } |
| #endif |
| return *mask != NULL; |
| } |
| EXPORT_SYMBOL(alloc_cpumask_var); |
| |
| void __init alloc_bootmem_cpumask_var(cpumask_var_t *mask) |
| { |
| *mask = alloc_bootmem(cpumask_size()); |
| } |
| |
| void free_cpumask_var(cpumask_var_t mask) |
| { |
| kfree(mask); |
| } |
| EXPORT_SYMBOL(free_cpumask_var); |
| #endif |