linux-kernel - Re: [PATCH v6 04/13] PCI/P2PDMA: Introduce configfs/sysfs enable attribute helpers

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Date:   Fri, 21 Sep 2018 15:12:10 -0600
From:   Logan Gunthorpe <logang@...tatee.com>
To:     Bjorn Helgaas <helgaas@...nel.org>
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>,
        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>,
        Jens Axboe <axboe@...nel.dk>
Subject: Re: [PATCH v6 04/13] PCI/P2PDMA: Introduce configfs/sysfs enable
 attribute helpers



On 2018-09-21 10:18 a.m., Bjorn Helgaas wrote:
> It'd be sort of nice if the contents of the sysfs file were valid
> things you could put *back* into it.  But it looks like the contents
> might be "none", which isn't valid for the store.  And the contents
> are never "on" or "off".

In fact, "none" would be accepted by strtobool() as a false (seeing it
starts with 'n' and strtobool() only looks at the first character).
However, per the rest of your feedback I've changed show() to report
"0", "1" or  pci_name() and dropped "auto". This matches what the other
strtobool configfs attributes are doing in NVMe target.

Logan