On 2021-01-25 08:30:12 [+0000], Christoph Hellwig wrote:

quoted

+static void blk_mq_complete_send_ipi(struct request *rq)
+{
+	struct llist_head *list;
+	unsigned int cpu;
+
+	cpu = rq->mq_ctx->cpu;
+	list = &per_cpu(blk_cpu_done, cpu);
+	if (llist_add(&rq->ipi_list, list)) {
+		INIT_CSD(&rq->csd, __blk_mq_complete_request_remote, rq);
+		smp_call_function_single_async(cpu, &rq->csd);
+	}
+}

Nit: it would be nice to initialize cpu and list in the declaration
lines.

Why? They get initialized later.

Otherwise looks good:

Reviewed-by: Christoph Hellwig <hch@lst.de>

Sebastian