linux-kernel - Re: [PATCH v2 02/10] PCI/P2PDMA: Add sysfs group to display p2pmem stats

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Date:   Thu, 1 Mar 2018 17:37:58 -0700
From:   Logan Gunthorpe <logang@...tatee.com>
To:     Dan Williams <dan.j.williams@...el.com>
Cc:     Bjorn Helgaas <helgaas@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-pci@...r.kernel.org, linux-nvme@...ts.infradead.org,
        linux-rdma <linux-rdma@...r.kernel.org>,
        linux-nvdimm <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>,
        Jérôme Glisse <jglisse@...hat.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Alex Williamson <alex.williamson@...hat.com>
Subject: Re: [PATCH v2 02/10] PCI/P2PDMA: Add sysfs group to display p2pmem
 stats



On 01/03/18 05:36 PM, Dan Williams wrote:
> On Thu, Mar 1, 2018 at 4:15 PM, Logan Gunthorpe <logang@...tatee.com> wrote:
>>
>>
>> On 01/03/18 10:44 AM, Bjorn Helgaas wrote:
>>>
>>> I think these two statements are out of order, since the attributes
>>> dereference pdev->p2pdma.  And it looks like you set "error"
>>> unnecessarily, since you return immediately looking at it.
>>
>>
>> Per the previous series, sysfs_create_group is must_check for some reason. I
>> had a printk there but you didn't think it was necessary. So assigning it to
>> error is the only way to squash the warning.
> 
> Why not fail the setup if the sysfs_create_group() fails? Sure, it may
> not be strictly required for userspace to have access to these
> attributes, but it seems hostile that userspace can't make assumptions
> about the presence of the "p2pmem" directory relative to the
> capability being setup.

Works for me. I'll do that.

Thanks,

Logan