linux-kernel - Re: [PATCH v2 3/8] block: Replace all ktype default

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Date:   Tue, 02 Apr 2019 09:02:38 -0700
From:   Bart Van Assche <bvanassche@....org>
To:     Kimberly Brown <kimbrownkd@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>
Cc:     Jens Axboe <axboe@...nel.dk>, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 3/8] block: Replace all ktype default_attrs with
 groups

On Mon, 2019-04-01 at 22:51 -0400, Kimberly Brown wrote:
> The kobj_type default_attrs field is being replaced by the
> default_groups field. Replace all of the ktype default_attrs fields in
> the block subsystem with default_groups and use the ATTRIBUTE_GROUPS
> macro to create the default groups.
> 
> Remove default_ctx_attrs[] because it doesn't contain any attributes.
> 
> This patch was tested by verifying that the sysfs files for the
> attributes in the default groups were created.
> 
> Signed-off-by: Kimberly Brown <kimbrownkd@...il.com>
> ---
>  block/blk-integrity.c | 3 ++-
>  block/blk-mq-sysfs.c  | 8 ++------
>  block/blk-sysfs.c     | 3 ++-
>  3 files changed, 6 insertions(+), 8 deletions(-)
> 
> diff --git a/block/blk-integrity.c b/block/blk-integrity.c
> index d1ab089e0919..85864c71e858 100644
> --- a/block/blk-integrity.c
> +++ b/block/blk-integrity.c
> @@ -365,6 +365,7 @@ static struct attribute *integrity_attrs[] = {
>  	&integrity_device_entry.attr,
>  	NULL,
>  };
> +ATTRIBUTE_GROUPS(integrity);
>  
>  static const struct sysfs_ops integrity_ops = {
>  	.show	= &integrity_attr_show,
> @@ -372,7 +373,7 @@ static const struct sysfs_ops integrity_ops = {
>  };
>  
>  static struct kobj_type integrity_ktype = {
> -	.default_attrs	= integrity_attrs,
> +	.default_groups = integrity_groups,
>  	.sysfs_ops	= &integrity_ops,
>  };
>  
> diff --git a/block/blk-mq-sysfs.c b/block/blk-mq-sysfs.c
> index 3f9c3f4ac44c..5315e538b3b1 100644
> --- a/block/blk-mq-sysfs.c
> +++ b/block/blk-mq-sysfs.c
> @@ -173,10 +173,6 @@ static ssize_t blk_mq_hw_sysfs_cpus_show(struct blk_mq_hw_ctx *hctx, char *page)
>  	return ret;
>  }
>  
> -static struct attribute *default_ctx_attrs[] = {
> -	NULL,
> -};
> -
>  static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_nr_tags = {
>  	.attr = {.name = "nr_tags", .mode = 0444 },
>  	.show = blk_mq_hw_sysfs_nr_tags_show,
> @@ -196,6 +192,7 @@ static struct attribute *default_hw_ctx_attrs[] = {
>  	&blk_mq_hw_sysfs_cpus.attr,
>  	NULL,
>  };
> +ATTRIBUTE_GROUPS(default_hw_ctx);
>  
>  static const struct sysfs_ops blk_mq_sysfs_ops = {
>  	.show	= blk_mq_sysfs_show,
> @@ -214,13 +211,12 @@ static struct kobj_type blk_mq_ktype = {
>  
>  static struct kobj_type blk_mq_ctx_ktype = {
>  	.sysfs_ops	= &blk_mq_sysfs_ops,
> -	.default_attrs	= default_ctx_attrs,
>  	.release	= blk_mq_ctx_sysfs_release,
>  };
>  
>  static struct kobj_type blk_mq_hw_ktype = {
>  	.sysfs_ops	= &blk_mq_hw_sysfs_ops,
> -	.default_attrs	= default_hw_ctx_attrs,
> +	.default_groups = default_hw_ctx_groups,
>  	.release	= blk_mq_hw_sysfs_release,
>  };
>  
> diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c
> index 422327089e0f..7a95a1eb27e1 100644
> --- a/block/blk-sysfs.c
> +++ b/block/blk-sysfs.c
> @@ -769,6 +769,7 @@ static struct attribute *default_attrs[] = {
>  #endif
>  	NULL,
>  };
> +ATTRIBUTE_GROUPS(default);
>  
>  #define to_queue(atr) container_of((atr), struct queue_sysfs_entry, attr)
>  
> @@ -890,7 +891,7 @@ static const struct sysfs_ops queue_sysfs_ops = {
>  
>  struct kobj_type blk_queue_ktype = {
>  	.sysfs_ops	= &queue_sysfs_ops,
> -	.default_attrs	= default_attrs,
> +	.default_groups = default_groups,
>  	.release	= blk_release_queue,
>  };

I think this should have been four patches instead of one.

Anyway:

Reviewed-by: Bart Van Assche <bvanassche@....org>