add an API to return free tags, blk-mq-tag will use it Signed-off-by: Shaohua Li --- include/linux/percpu_ida.h | 1 + lib/percpu_ida.c | 17 +++++++++++++++++ 2 files changed, 18 insertions(+) Index: master/include/linux/percpu_ida.h =================================================================== --- master.orig/include/linux/percpu_ida.h 2013-10-11 12:15:06.996416710 +0800 +++ master/include/linux/percpu_ida.h 2013-10-11 12:15:06.992416749 +0800 @@ -76,4 +76,5 @@ static inline int percpu_ida_init(struct int percpu_ida_for_each_free(struct percpu_ida *pool, int (*fn)(int id, void *data), void *data); +unsigned percpu_ida_free_tags(struct percpu_ida *pool, int cpu); #endif /* __PERCPU_IDA_H__ */ Index: master/lib/percpu_ida.c =================================================================== --- master.orig/lib/percpu_ida.c 2013-10-11 12:15:06.996416710 +0800 +++ master/lib/percpu_ida.c 2013-10-11 12:15:06.992416749 +0800 @@ -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); -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/