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);