Re: [PATCH 06/16] libnvdimm: Move nd_mapping_attribute_group to device_type

From: "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>
To: Dan Williams <dan.j.williams@intel.com>, linux-nvdimm@lists.01.org
Cc: Michael Ellerman <mpe@ellerman.id.au>,
	peterz@infradead.org, dave.hansen@linux.intel.com,
	linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: [PATCH 06/16] libnvdimm: Move nd_mapping_attribute_group to device_type
Date: Tue, 12 Nov 2019 17:15:58 +0530	[thread overview]
Message-ID: <87woc5s4g9.fsf@linux.ibm.com> (raw)
In-Reply-To: <157309902686.1582359.6749533709859492704.stgit@dwillia2-desk3.amr.corp.intel.com>

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

> A 'struct device_type' instance can carry default attributes for the
> device. Use this facility to remove the export of
> nd_mapping_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@linux.ibm.com>

> Cc: Ira Weiny <ira.weiny@intel.com>
> Cc: Michael Ellerman <mpe@ellerman.id.au>
> Cc: "Oliver O'Halloran" <oohall@gmail.com>
> Cc: Vishal Verma <vishal.l.verma@intel.com>
> Cc: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
> ---
>  arch/powerpc/platforms/pseries/papr_scm.c |    6 ------
>  drivers/acpi/nfit/core.c                  |    1 -
>  drivers/nvdimm/region_devs.c              |    4 ++--
>  include/linux/libnvdimm.h                 |    1 -
>  4 files changed, 2 insertions(+), 10 deletions(-)
>
> diff --git a/arch/powerpc/platforms/pseries/papr_scm.c b/arch/powerpc/platforms/pseries/papr_scm.c
> index 6428834d7cd5..0405fb769336 100644
> --- a/arch/powerpc/platforms/pseries/papr_scm.c
> +++ b/arch/powerpc/platforms/pseries/papr_scm.c
> @@ -284,11 +284,6 @@ int papr_scm_ndctl(struct nvdimm_bus_descriptor *nd_desc, struct nvdimm *nvdimm,
>  	return 0;
>  }
>  
> -static const struct attribute_group *region_attr_groups[] = {
> -	&nd_mapping_attribute_group,
> -	NULL,
> -};
> -
>  static const struct attribute_group *bus_attr_groups[] = {
>  	&nvdimm_bus_attribute_group,
>  	NULL,
> @@ -362,7 +357,6 @@ static int papr_scm_nvdimm_init(struct papr_scm_priv *p)
>  	mapping.size = p->blocks * p->block_size; // XXX: potential overflow?
>  
>  	memset(&ndr_desc, 0, sizeof(ndr_desc));
> -	ndr_desc.attr_groups = region_attr_groups;
>  	target_nid = dev_to_node(&p->pdev->dev);
>  	online_nid = papr_scm_node(target_nid);
>  	ndr_desc.numa_node = online_nid;
> diff --git a/drivers/acpi/nfit/core.c b/drivers/acpi/nfit/core.c
> index 99e20b8b6ea0..69c406ecc3a6 100644
> --- a/drivers/acpi/nfit/core.c
> +++ b/drivers/acpi/nfit/core.c
> @@ -2196,7 +2196,6 @@ static const struct attribute_group acpi_nfit_region_attribute_group = {
>  };
>  
>  static const struct attribute_group *acpi_nfit_region_attribute_groups[] = {
> -	&nd_mapping_attribute_group,
>  	&acpi_nfit_region_attribute_group,
>  	NULL,
>  };
> diff --git a/drivers/nvdimm/region_devs.c b/drivers/nvdimm/region_devs.c
> index f97166583294..0afc1973e938 100644
> --- a/drivers/nvdimm/region_devs.c
> +++ b/drivers/nvdimm/region_devs.c
> @@ -751,11 +751,10 @@ static struct attribute *mapping_attributes[] = {
>  	NULL,
>  };
>  
> -struct attribute_group nd_mapping_attribute_group = {
> +static const struct attribute_group nd_mapping_attribute_group = {
>  	.is_visible = mapping_visible,
>  	.attrs = mapping_attributes,
>  };
> -EXPORT_SYMBOL_GPL(nd_mapping_attribute_group);
>  
>  static const struct attribute_group nd_region_attribute_group = {
>  	.attrs = nd_region_attributes,
> @@ -766,6 +765,7 @@ static const struct attribute_group *nd_region_attribute_groups[] = {
>  	&nd_device_attribute_group,
>  	&nd_region_attribute_group,
>  	&nd_numa_attribute_group,
> +	&nd_mapping_attribute_group,
>  	NULL,
>  };
>  
> diff --git a/include/linux/libnvdimm.h b/include/linux/libnvdimm.h
> index 312248d334c7..eb597d1cb891 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_mapping_attribute_group;
>  
>  struct nvdimm;
>  struct nvdimm_bus_descriptor;
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