diff options
| -rw-r--r-- | include/linux/cpumask.h | 15 | ||||
| -rw-r--r-- | lib/cpumask.c | 17 |
2 files changed, 23 insertions, 9 deletions
diff --git a/include/linux/cpumask.h b/include/linux/cpumask.h index 4b29e508a0b..f770039344c 100644 --- a/include/linux/cpumask.h +++ b/include/linux/cpumask.h @@ -396,6 +396,12 @@ extern cpumask_t cpu_present_map; #define cpu_present(cpu) ((cpu) == 0) #endif +#ifdef CONFIG_SMP +int highest_possible_processor_id(void); +#else +#define highest_possible_processor_id() 0 +#endif + #define any_online_cpu(mask) \ ({ \ int cpu; \ @@ -409,14 +415,5 @@ extern cpumask_t cpu_present_map; #define for_each_online_cpu(cpu) for_each_cpu_mask((cpu), cpu_online_map) #define for_each_present_cpu(cpu) for_each_cpu_mask((cpu), cpu_present_map) -/* Find the highest possible smp_processor_id() */ -#define highest_possible_processor_id() \ -({ \ - unsigned int cpu, highest = 0; \ - for_each_cpu_mask(cpu, cpu_possible_map) \ - highest = cpu; \ - highest; \ -}) - #endif /* __LINUX_CPUMASK_H */ diff --git a/lib/cpumask.c b/lib/cpumask.c index ba2f8543052..ea25a034276 100644 --- a/lib/cpumask.c +++ b/lib/cpumask.c @@ -14,3 +14,20 @@ 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); + +/* + * Find the highest possible smp_processor_id() + * + * Note: if we're prepared to assume that cpu_possible_map never changes + * (reasonable) then this function should cache its return value. + */ +int highest_possible_processor_id(void) +{ + unsigned int cpu; + unsigned highest = 0; + + for_each_cpu_mask(cpu, cpu_possible_map) + highest = cpu; + return highest; +} +EXPORT_SYMBOL(highest_possible_processor_id); |