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Date:   Tue, 02 Apr 2019 11:06:40 -0700
From:   Bart Van Assche <bvanassche@....org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.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, 2019-04-02 at 19:46 +0200, Greg Kroah-Hartman wrote:
> 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?

Hi Greg,

Not that it matters, but I see four changes in this patch: three conversions
from default_attrs into default_groups and also the removal of default_ctx_attrs.

Thanks,

Bart.

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