linux-kernel - Re: [PATCH 09/12] nvme-pci: Use PCI p2pmem subsystem to manage the CMB

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Message-ID: <281272464.115248600.1515166226009.JavaMail.zimbra@kalray.eu>
Date:   Fri, 5 Jan 2018 16:30:26 +0100 (CET)
From:   Marta Rybczynska <mrybczyn@...ray.eu>
To:     Logan Gunthorpe <logang@...tatee.com>
Cc:     linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
        linux-nvme@...ts.infradead.org, linux-rdma@...r.kernel.org,
        linux-nvdimm@...ts.01.org, linux-block@...r.kernel.org,
        Stephen Bates <sbates@...thlin.com>,
        Christoph Hellwig <hch@....de>, Jens Axboe <axboe@...nel.dk>,
        Keith Busch <keith.busch@...el.com>,
        Sagi Grimberg <sagi@...mberg.me>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Jason Gunthorpe <jgg@...lanox.com>,
        Max Gurtovoy <maxg@...lanox.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Jérôme Glisse <jglisse@...hat.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>
Subject: Re: [PATCH 09/12] nvme-pci: Use PCI p2pmem subsystem to manage the
 CMB

> @@ -429,10 +429,7 @@ static void __nvme_submit_cmd(struct nvme_queue *nvmeq,
> {
> 	u16 tail = nvmeq->sq_tail;
> 
> -	if (nvmeq->sq_cmds_io)
> -		memcpy_toio(&nvmeq->sq_cmds_io[tail], cmd, sizeof(*cmd));
> -	else
> -		memcpy(&nvmeq->sq_cmds[tail], cmd, sizeof(*cmd));
> +	memcpy(&nvmeq->sq_cmds[tail], cmd, sizeof(*cmd));
> 

Why is it always memcpy() and not memcpy_toio()? I'd expect something like
if (nvmeq->sq_cmds_is_io)
	memcpy_toio(&nvmeq->sq_cmds_io[tail], cmd, sizeof(*cmd));
else
	memcpy(&nvmeq->sq_cmds[tail], cmd, sizeof(*cmd));

Marta