linux-kernel - Re: [PATCH v2 04/18] libnvdimm: Move nd_numa_attribute_group to device

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Message-ID: <87r225h5zg.fsf@linux.ibm.com>
Date:   Mon, 18 Nov 2019 15:16:27 +0530
From:   "Aneesh Kumar K.V" <aneesh.kumar@...ux.ibm.com>
To:     Dan Williams <dan.j.williams@...el.com>, linux-nvdimm@...ts.01.org
Cc:     Ira Weiny <ira.weiny@...el.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        "Oliver O'Halloran" <oohall@...il.com>,
        Vishal Verma <vishal.l.verma@...el.com>, peterz@...radead.org,
        dave.hansen@...ux.intel.com, hch@....de,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        linux-acpi@...r.kernel.org
Subject: Re: [PATCH v2 04/18] libnvdimm: Move nd_numa_attribute_group to device_type

Dan Williams <dan.j.williams@...el.com> writes:

> A 'struct device_type' instance can carry default attributes for the
> device. Use this facility to remove the export of
> nd_numa_attribute_group and put the responsibility on the core rather
> than leaf implementations to define this attribute.
>
Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@...ux.ibm.com>

> Cc: Ira Weiny <ira.weiny@...el.com>
> Cc: Michael Ellerman <mpe@...erman.id.au>
> Cc: "Oliver O'Halloran" <oohall@...il.com>
> Cc: Vishal Verma <vishal.l.verma@...el.com>
> Cc: Aneesh Kumar K.V <aneesh.kumar@...ux.ibm.com>
> Signed-off-by: Dan Williams <dan.j.williams@...el.com>
> Link: https://lore.kernel.org/r/157309901655.1582359.18126990555058555754.stgit@dwillia2-desk3.amr.corp.intel.com
> ---
>  arch/powerpc/platforms/pseries/papr_scm.c |    1 -
>  drivers/acpi/nfit/core.c                  |    1 -
>  drivers/nvdimm/bus.c                      |    3 +--
>  drivers/nvdimm/nd.h                       |    1 +
>  drivers/nvdimm/region_devs.c              |    1 +
>  include/linux/libnvdimm.h                 |    1 -
>  6 files changed, 3 insertions(+), 5 deletions(-)
>
> diff --git a/arch/powerpc/platforms/pseries/papr_scm.c b/arch/powerpc/platforms/pseries/papr_scm.c
> index 04726f8fd189..6ffda03a6349 100644
> --- a/arch/powerpc/platforms/pseries/papr_scm.c
> +++ b/arch/powerpc/platforms/pseries/papr_scm.c
> @@ -287,7 +287,6 @@ int papr_scm_ndctl(struct nvdimm_bus_descriptor *nd_desc, struct nvdimm *nvdimm,
>  static const struct attribute_group *region_attr_groups[] = {
>  	&nd_region_attribute_group,
>  	&nd_mapping_attribute_group,
> -	&nd_numa_attribute_group,
>  	NULL,
>  };
>  
> diff --git a/drivers/acpi/nfit/core.c b/drivers/acpi/nfit/core.c
> index dec7c2b08672..b3213faf37b5 100644
> --- a/drivers/acpi/nfit/core.c
> +++ b/drivers/acpi/nfit/core.c
> @@ -2198,7 +2198,6 @@ static const struct attribute_group acpi_nfit_region_attribute_group = {
>  static const struct attribute_group *acpi_nfit_region_attribute_groups[] = {
>  	&nd_region_attribute_group,
>  	&nd_mapping_attribute_group,
> -	&nd_numa_attribute_group,
>  	&acpi_nfit_region_attribute_group,
>  	NULL,
>  };
> diff --git a/drivers/nvdimm/bus.c b/drivers/nvdimm/bus.c
> index eb422527dd57..28e1b265aa63 100644
> --- a/drivers/nvdimm/bus.c
> +++ b/drivers/nvdimm/bus.c
> @@ -697,11 +697,10 @@ static umode_t nd_numa_attr_visible(struct kobject *kobj, struct attribute *a,
>  /*
>   * nd_numa_attribute_group - NUMA attributes for all devices on an nd bus
>   */
> -struct attribute_group nd_numa_attribute_group = {
> +const struct attribute_group nd_numa_attribute_group = {
>  	.attrs = nd_numa_attributes,
>  	.is_visible = nd_numa_attr_visible,
>  };
> -EXPORT_SYMBOL_GPL(nd_numa_attribute_group);
>  
>  int nvdimm_bus_create_ndctl(struct nvdimm_bus *nvdimm_bus)
>  {
> diff --git a/drivers/nvdimm/nd.h b/drivers/nvdimm/nd.h
> index 21e018bfa188..ec3d5f619957 100644
> --- a/drivers/nvdimm/nd.h
> +++ b/drivers/nvdimm/nd.h
> @@ -240,6 +240,7 @@ void nvdimm_exit(void);
>  void nd_region_exit(void);
>  struct nvdimm;
>  extern const struct attribute_group nd_device_attribute_group;
> +extern const struct attribute_group nd_numa_attribute_group;
>  struct nvdimm_drvdata *to_ndd(struct nd_mapping *nd_mapping);
>  int nvdimm_check_config_data(struct device *dev);
>  int nvdimm_init_nsarea(struct nvdimm_drvdata *ndd);
> diff --git a/drivers/nvdimm/region_devs.c b/drivers/nvdimm/region_devs.c
> index 710b5111eaa8..e4281f806adc 100644
> --- a/drivers/nvdimm/region_devs.c
> +++ b/drivers/nvdimm/region_devs.c
> @@ -765,6 +765,7 @@ EXPORT_SYMBOL_GPL(nd_region_attribute_group);
>  
>  static const struct attribute_group *nd_region_attribute_groups[] = {
>  	&nd_device_attribute_group,
> +	&nd_numa_attribute_group,
>  	NULL,
>  };
>  
> diff --git a/include/linux/libnvdimm.h b/include/linux/libnvdimm.h
> index d7dbf42498af..e9a4e25fc708 100644
> --- a/include/linux/libnvdimm.h
> +++ b/include/linux/libnvdimm.h
> @@ -67,7 +67,6 @@ enum {
>  
>  extern struct attribute_group nvdimm_bus_attribute_group;
>  extern struct attribute_group nvdimm_attribute_group;
> -extern struct attribute_group nd_numa_attribute_group;
>  extern struct attribute_group nd_region_attribute_group;
>  extern struct attribute_group nd_mapping_attribute_group;
>