diff options
| -rw-r--r-- | include/linux/percpu_ida.h | 1 | ||||
| -rw-r--r-- | lib/percpu_ida.c | 17 |
2 files changed, 18 insertions, 0 deletions
diff --git a/include/linux/percpu_ida.h b/include/linux/percpu_ida.h index 63510ae6f933..1900bd0fa639 100644 --- a/include/linux/percpu_ida.h +++ b/include/linux/percpu_ida.h @@ -77,4 +77,5 @@ typedef int (*percpu_ida_cb)(unsigned, void *); int percpu_ida_for_each_free(struct percpu_ida *pool, percpu_ida_cb fn, void *data); +unsigned percpu_ida_free_tags(struct percpu_ida *pool, int cpu); #endif /* __PERCPU_IDA_H__ */ diff --git a/lib/percpu_ida.c b/lib/percpu_ida.c index 0f51c1b556cf..b0698ea972c6 100644 --- a/lib/percpu_ida.c +++ b/lib/percpu_ida.c @@ -371,3 +371,20 @@ out: return err; } EXPORT_SYMBOL_GPL(percpu_ida_for_each_free); + +/** + * percpu_ida_free_tags - return free tags number of a specific cpu or global pool + * @pool: pool related + * @cpu: specific cpu or global pool if @cpu == nr_cpu_ids + * + * Note: this just returns a snapshot of free tags number. + */ +unsigned percpu_ida_free_tags(struct percpu_ida *pool, int cpu) +{ + struct percpu_ida_cpu *remote; + if (cpu == nr_cpu_ids) + return pool->nr_free; + remote = per_cpu_ptr(pool->tag_cpu, cpu); + return remote->nr_free; +} +EXPORT_SYMBOL_GPL(percpu_ida_free_tags); |