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

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Date:   Tue, 2 Apr 2019 19:46:29 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Bart Van Assche <bvanassche@....org>
Cc:     Kimberly Brown <kimbrownkd@...il.com>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        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 Tue, Apr 02, 2019 at 09:02:38AM -0700, Bart Van Assche wrote:
> 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.

4?  I could maybe see 3, how would you make 4 patches out of this?

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

Thanks for the review, I'll queue this up in a few days.

greg k-h