blk_mq_hctx_set_fq_lock_class
EXPORT_SYMBOL_GPL(blk_mq_hctx_set_fq_lock_class);
blk_mq_hctx_set_fq_lock_class(hctx, &loop_hctx_fq_lock_key);
void blk_mq_hctx_set_fq_lock_class(struct blk_mq_hw_ctx *hctx,