linux-kernel - Re: [PATCH v5 07/13] block: Add PCI P2P flag for request queue and check support for requests

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Message-ID: <3af4d1d4-da07-c0a6-8464-9ddc1378f2f4@kernel.dk>
Date:   Wed, 5 Sep 2018 14:19:39 -0600
From:   Jens Axboe <axboe@...nel.dk>
To:     Logan Gunthorpe <logang@...tatee.com>,
        Christoph Hellwig <hch@....de>
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>,
        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>,
        Alex Williamson <alex.williamson@...hat.com>,
        Christian König <christian.koenig@....com>
Subject: Re: [PATCH v5 07/13] block: Add PCI P2P flag for request queue and
 check support for requests

On 9/5/18 2:18 PM, Logan Gunthorpe wrote:
> 
> 
> On 05/09/18 02:14 PM, Jens Axboe wrote:
>> But if the caller must absolutely know where the bio will end up, then
>> it seems super redundant. So I'd vote for killing this check, it buys
>> us absolutely nothing and isn't even exhaustive in its current form.
> 
> 
> Ok, I'll remove it for v6.

Since the drivers needs to know it's doing it right, it might not
hurt to add a sanity check helper for that. Just have the driver
call it, and don't add it in the normal IO submission path.

-- 
Jens Axboe