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-rw-r--r--block/blk-stat.c18
1 files changed, 18 insertions, 0 deletions
diff --git a/block/blk-stat.c b/block/blk-stat.c
index ae3dd1fb8e61..efb2a80db906 100644
--- a/block/blk-stat.c
+++ b/block/blk-stat.c
@@ -219,3 +219,21 @@ void blk_free_queue_stats(struct blk_queue_stats *stats)
kfree(stats);
}
+
+bool blk_stats_alloc_enable(struct request_queue *q)
+{
+ struct blk_rq_stat *poll_stat;
+
+ poll_stat = kcalloc(BLK_MQ_POLL_STATS_BKTS, sizeof(*poll_stat),
+ GFP_ATOMIC);
+ if (!poll_stat)
+ return false;
+
+ if (cmpxchg(&q->poll_stat, NULL, poll_stat) != NULL) {
+ kfree(poll_stat);
+ return true;
+ }
+
+ blk_stat_add_callback(q, q->poll_cb);
+ return false;
+}