linux-kernel - Re: [PATCH v2 5/7] acpi, nfit: Show bus_dsm

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Date:   Wed, 28 Jun 2017 14:07:20 -0700
From:   Dan Williams <dan.j.williams@...el.com>
To:     Jerry Hoemann <jerry.hoemann@....com>
Cc:     "linux-nvdimm@...ts.01.org" <linux-nvdimm@...ts.01.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 5/7] acpi, nfit: Show bus_dsm_mask

On Tue, Jun 20, 2017 at 9:51 AM, Jerry Hoemann <jerry.hoemann@....com> wrote:
> Add bus_dsm_mask to sysfs display under /sys/bus/nd/devices/ndbusX/nfit.
>
> Signed-off-by: Jerry Hoemann <jerry.hoemann@....com>
> ---
>  drivers/acpi/nfit/core.c | 10 ++++++++++
>  1 file changed, 10 insertions(+)
>
> diff --git a/drivers/acpi/nfit/core.c b/drivers/acpi/nfit/core.c
> index 9d281a4..f133b3e 100644
> --- a/drivers/acpi/nfit/core.c
> +++ b/drivers/acpi/nfit/core.c
> @@ -928,6 +928,15 @@ static int nfit_mem_init(struct acpi_nfit_desc *acpi_desc)
>         return 0;
>  }
>
> +static ssize_t bus_dsm_mask_show(struct device *dev,
> +               struct device_attribute *attr, char *buf)
> +{
> +       struct nvdimm_bus *nvdimm_bus = to_nvdimm_bus(dev);
> +       struct nvdimm_bus_descriptor *nd_desc = to_nd_desc(nvdimm_bus);
> +       return sprintf(buf, "%#lx\n", nd_desc->bus_dsm_mask);
> +}
> +static DEVICE_ATTR_RO(bus_dsm_mask);
> +
>  static ssize_t revision_show(struct device *dev,
>                 struct device_attribute *attr, char *buf)
>  {
> @@ -1064,6 +1073,7 @@ static umode_t nfit_visible(struct kobject *kobj, struct attribute *a, int n)
>         &dev_attr_revision.attr,
>         &dev_attr_scrub.attr,
>         &dev_attr_hw_error_scrub.attr,
> +       &dev_attr_bus_dsm_mask.attr,
>         NULL,
>  };

I think it's redundant to keep 'bus_' in the name of the attribute
since 'bus' is included in the sysfs path. You can use DEVICE_ATTR()
instead of DEVICE_ATTR_RO() to specify the attribute name manually,
and get around the collision with the existing dsm_mash_show()
routine.