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From: Christoph Hellwig <hch@lst.de>
To: Jan Kara <jack@suse.cz>
Cc: Christoph Hellwig <hch@lst.de>, Jens Axboe <axboe@kernel.dk>,
	Tejun Heo <tj@kernel.org>, Josef Bacik <josef@toxicpanda.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
	Coly Li <colyli@suse.de>, Mike Snitzer <snitzer@redhat.com>,
	dm-devel@redhat.com, Richard Weinberger <richard@nod.at>,
	Jan Kara <jack@suse.com>,
	linux-block@vger.kernel.org, xen-devel@lists.xenproject.org,
	linux-bcache@vger.kernel.org, linux-mtd@lists.infradead.org,
	linux-fsdevel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: [PATCH 15/20] block: merge struct block_device and struct hd_struct
Date: Fri, 20 Nov 2020 10:15:46 +0100	[thread overview]
Message-ID: <20201120091546.GE21715@lst.de> (raw)
In-Reply-To: <20201119143921.GX1981@quack2.suse.cz>

On Thu, Nov 19, 2020 at 03:39:21PM +0100, Jan Kara wrote:
> This patch is kind of difficult to review due to the size of mostly
> mechanical changes mixed with not completely mechanical changes. Can we
> perhaps split out the mechanical bits? E.g. the rq->part => rq->bdev
> renaming is mechanical and notable part of the patch. Similarly the
> part->foo => part->bd_foo bits...

We'd end with really weird patches that way.  Never mind that I'm not
even sure how we could mechnically do the renaming.

> 
> Also I'm kind of wondering: AFAIU the new lifetime rules, gendisk holds
> bdev reference and bdev is created on gendisk allocation so bdev lifetime is
> strictly larger than gendisk lifetime. But what now keeps bdev->bd_disk
> reference safe in presence device hot unplug? In most cases we are still
> protected by gendisk reference taken in __blkdev_get() but how about
> disk->lookup_sem and disk->flags dereferences before we actually grab the
> reference?

Good question.  I'll need to think about this a bit more.

> Also I find it rather non-obvious (although elegant ;) that bdev->bd_device
> rules the lifetime of gendisk. Can you perhaps explain this in the
> changelog and probably also add somewhere to source a documentation about
> the new lifetime rules?

Yes.

> > -struct hd_struct *__disk_get_part(struct gendisk *disk, int partno);
> > +static inline struct block_device *__bdget_disk(struct gendisk *disk,
> > +		int partno)
> > +{
> > +	struct disk_part_tbl *ptbl = rcu_dereference(disk->part_tbl);
> > +
> > +	if (unlikely(partno < 0 || partno >= ptbl->len))
> > +		return NULL;
> > +	return rcu_dereference(ptbl->part[partno]);
> > +}
> 
> I understand this is lower-level counterpart of bdget_disk() but it is
> confusing to me that this has 'bdget' in the name and returns no bdev
> reference. Can we call it like __bdev_from_disk() or something like that?

Sure.

WARNING: multiple messages have this Message-ID (diff)
From: Christoph Hellwig <hch@lst.de>
To: Jan Kara <jack@suse.cz>
Cc: Jens Axboe <axboe@kernel.dk>, Mike Snitzer <snitzer@redhat.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
	Richard Weinberger <richard@nod.at>,
	Josef Bacik <josef@toxicpanda.com>, Coly Li <colyli@suse.de>,
	linux-block@vger.kernel.org, linux-fsdevel@vger.kernel.org,
	dm-devel@redhat.com, linux-mtd@lists.infradead.org,
	linux-mm@kvack.org, Jan Kara <jack@suse.com>,
	Tejun Heo <tj@kernel.org>,
	xen-devel@lists.xenproject.org, linux-bcache@vger.kernel.org,
	Christoph Hellwig <hch@lst.de>
Subject: Re: [PATCH 15/20] block: merge struct block_device and struct hd_struct
Date: Fri, 20 Nov 2020 10:15:46 +0100	[thread overview]
Message-ID: <20201120091546.GE21715@lst.de> (raw)
In-Reply-To: <20201119143921.GX1981@quack2.suse.cz>

On Thu, Nov 19, 2020 at 03:39:21PM +0100, Jan Kara wrote:
> This patch is kind of difficult to review due to the size of mostly
> mechanical changes mixed with not completely mechanical changes. Can we
> perhaps split out the mechanical bits? E.g. the rq->part => rq->bdev
> renaming is mechanical and notable part of the patch. Similarly the
> part->foo => part->bd_foo bits...

We'd end with really weird patches that way.  Never mind that I'm not
even sure how we could mechnically do the renaming.

> 
> Also I'm kind of wondering: AFAIU the new lifetime rules, gendisk holds
> bdev reference and bdev is created on gendisk allocation so bdev lifetime is
> strictly larger than gendisk lifetime. But what now keeps bdev->bd_disk
> reference safe in presence device hot unplug? In most cases we are still
> protected by gendisk reference taken in __blkdev_get() but how about
> disk->lookup_sem and disk->flags dereferences before we actually grab the
> reference?

Good question.  I'll need to think about this a bit more.

> Also I find it rather non-obvious (although elegant ;) that bdev->bd_device
> rules the lifetime of gendisk. Can you perhaps explain this in the
> changelog and probably also add somewhere to source a documentation about
> the new lifetime rules?

Yes.

> > -struct hd_struct *__disk_get_part(struct gendisk *disk, int partno);
> > +static inline struct block_device *__bdget_disk(struct gendisk *disk,
> > +		int partno)
> > +{
> > +	struct disk_part_tbl *ptbl = rcu_dereference(disk->part_tbl);
> > +
> > +	if (unlikely(partno < 0 || partno >= ptbl->len))
> > +		return NULL;
> > +	return rcu_dereference(ptbl->part[partno]);
> > +}
> 
> I understand this is lower-level counterpart of bdget_disk() but it is
> confusing to me that this has 'bdget' in the name and returns no bdev
> reference. Can we call it like __bdev_from_disk() or something like that?

Sure.

______________________________________________________
Linux MTD discussion mailing list
http://lists.infradead.org/mailman/listinfo/linux-mtd/

WARNING: multiple messages have this Message-ID (diff)
From: Christoph Hellwig <hch@lst.de>
To: Jan Kara <jack@suse.cz>
Cc: Jens Axboe <axboe@kernel.dk>, Mike Snitzer <snitzer@redhat.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
	Richard Weinberger <richard@nod.at>,
	Josef Bacik <josef@toxicpanda.com>, Coly Li <colyli@suse.de>,
	linux-block@vger.kernel.org, linux-fsdevel@vger.kernel.org,
	dm-devel@redhat.com, linux-mtd@lists.infradead.org,
	linux-mm@kvack.org, Jan Kara <jack@suse.com>,
	Tejun Heo <tj@kernel.org>,
	xen-devel@lists.xenproject.org, linux-bcache@vger.kernel.org,
	Christoph Hellwig <hch@lst.de>
Subject: Re: [dm-devel] [PATCH 15/20] block: merge struct block_device and struct hd_struct
Date: Fri, 20 Nov 2020 10:15:46 +0100	[thread overview]
Message-ID: <20201120091546.GE21715@lst.de> (raw)
In-Reply-To: <20201119143921.GX1981@quack2.suse.cz>

On Thu, Nov 19, 2020 at 03:39:21PM +0100, Jan Kara wrote:
> This patch is kind of difficult to review due to the size of mostly
> mechanical changes mixed with not completely mechanical changes. Can we
> perhaps split out the mechanical bits? E.g. the rq->part => rq->bdev
> renaming is mechanical and notable part of the patch. Similarly the
> part->foo => part->bd_foo bits...

We'd end with really weird patches that way.  Never mind that I'm not
even sure how we could mechnically do the renaming.

> 
> Also I'm kind of wondering: AFAIU the new lifetime rules, gendisk holds
> bdev reference and bdev is created on gendisk allocation so bdev lifetime is
> strictly larger than gendisk lifetime. But what now keeps bdev->bd_disk
> reference safe in presence device hot unplug? In most cases we are still
> protected by gendisk reference taken in __blkdev_get() but how about
> disk->lookup_sem and disk->flags dereferences before we actually grab the
> reference?

Good question.  I'll need to think about this a bit more.

> Also I find it rather non-obvious (although elegant ;) that bdev->bd_device
> rules the lifetime of gendisk. Can you perhaps explain this in the
> changelog and probably also add somewhere to source a documentation about
> the new lifetime rules?

Yes.

> > -struct hd_struct *__disk_get_part(struct gendisk *disk, int partno);
> > +static inline struct block_device *__bdget_disk(struct gendisk *disk,
> > +		int partno)
> > +{
> > +	struct disk_part_tbl *ptbl = rcu_dereference(disk->part_tbl);
> > +
> > +	if (unlikely(partno < 0 || partno >= ptbl->len))
> > +		return NULL;
> > +	return rcu_dereference(ptbl->part[partno]);
> > +}
> 
> I understand this is lower-level counterpart of bdget_disk() but it is
> confusing to me that this has 'bdget' in the name and returns no bdev
> reference. Can we call it like __bdev_from_disk() or something like that?

Sure.

--
dm-devel mailing list
dm-devel@redhat.com
https://www.redhat.com/mailman/listinfo/dm-devel


  reply	other threads:[~2020-11-20  9:16 UTC|newest]

Thread overview: 237+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-11-18  8:47 merge struct block_device and struct hd_struct Christoph Hellwig
2020-11-18  8:47 ` [dm-devel] " Christoph Hellwig
2020-11-18  8:47 ` Christoph Hellwig
2020-11-18  8:47 ` [PATCH 01/20] blk-cgroup: fix a hd_struct leak in blkcg_fill_root_iostats Christoph Hellwig
2020-11-18  8:47   ` [dm-devel] " Christoph Hellwig
2020-11-18  8:47   ` Christoph Hellwig
2020-11-18 14:09   ` Jan Kara
2020-11-18 14:09     ` [dm-devel] " Jan Kara
2020-11-18 14:09     ` Jan Kara
2020-11-19  8:37   ` Johannes Thumshirn
2020-11-19  8:37     ` [dm-devel] " Johannes Thumshirn
2020-11-19  8:37     ` Johannes Thumshirn
2020-11-24 12:26   ` Tejun Heo
2020-11-24 12:26     ` [dm-devel] " Tejun Heo
2020-11-24 12:26     ` Tejun Heo
2020-11-18  8:47 ` [PATCH 02/20] block: remove a duplicate __disk_get_part prototype Christoph Hellwig
2020-11-18  8:47   ` [dm-devel] " Christoph Hellwig
2020-11-18  8:47   ` Christoph Hellwig
2020-11-18 14:10   ` Jan Kara
2020-11-18 14:10     ` [dm-devel] " Jan Kara
2020-11-18 14:10     ` Jan Kara
2020-11-19  8:37   ` Johannes Thumshirn
2020-11-19  8:37     ` [dm-devel] " Johannes Thumshirn
2020-11-19  8:37     ` Johannes Thumshirn
2020-11-18  8:47 ` [PATCH 03/20] block: add a bdev_kobj helper Christoph Hellwig
2020-11-18  8:47   ` [dm-devel] " Christoph Hellwig
2020-11-18  8:47   ` Christoph Hellwig
2020-11-18 14:18   ` Jan Kara
2020-11-18 14:18     ` [dm-devel] " Jan Kara
2020-11-18 14:18     ` Jan Kara
2020-11-19  8:37   ` Johannes Thumshirn
2020-11-19  8:37     ` [dm-devel] " Johannes Thumshirn
2020-11-19  8:37     ` Johannes Thumshirn
2020-11-18  8:47 ` [PATCH 04/20] block: use disk_part_iter_exit in disk_part_iter_next Christoph Hellwig
2020-11-18  8:47   ` [dm-devel] " Christoph Hellwig
2020-11-18  8:47   ` Christoph Hellwig
2020-11-18 14:19   ` Jan Kara
2020-11-18 14:19     ` [dm-devel] " Jan Kara
2020-11-18 14:19     ` Jan Kara
2020-11-19  8:37   ` Johannes Thumshirn
2020-11-19  8:37     ` [dm-devel] " Johannes Thumshirn
2020-11-19  8:37     ` Johannes Thumshirn
2020-11-18  8:47 ` [PATCH 05/20] block: use put_device in put_disk Christoph Hellwig
2020-11-18  8:47   ` [dm-devel] " Christoph Hellwig
2020-11-18  8:47   ` Christoph Hellwig
2020-11-18 14:20   ` Jan Kara
2020-11-18 14:20     ` [dm-devel] " Jan Kara
2020-11-18 14:20     ` Jan Kara
2020-11-19  8:38   ` Johannes Thumshirn
2020-11-19  8:38     ` [dm-devel] " Johannes Thumshirn
2020-11-19  8:38     ` Johannes Thumshirn
2020-11-18  8:47 ` [PATCH 06/20] block: change the hash used for looking up block devices Christoph Hellwig
2020-11-18  8:47   ` [dm-devel] " Christoph Hellwig
2020-11-18  8:47   ` Christoph Hellwig
2020-11-18 14:22   ` Jan Kara
2020-11-18 14:22     ` [dm-devel] " Jan Kara
2020-11-18 14:22     ` Jan Kara
2020-11-18  8:47 ` [PATCH 07/20] init: refactor name_to_dev_t Christoph Hellwig
2020-11-18  8:47   ` [dm-devel] " Christoph Hellwig
2020-11-18  8:47   ` Christoph Hellwig
2020-11-18 14:37   ` Jan Kara
2020-11-18 14:37     ` [dm-devel] " Jan Kara
2020-11-18 14:37     ` Jan Kara
2020-11-19  7:52     ` Christoph Hellwig
2020-11-19  7:52       ` [dm-devel] " Christoph Hellwig
2020-11-19  7:52       ` Christoph Hellwig
2020-11-19  8:25       ` Jan Kara
2020-11-19  8:25         ` [dm-devel] " Jan Kara
2020-11-19  8:25         ` Jan Kara
2020-11-20  8:49         ` Christoph Hellwig
2020-11-20  8:49           ` [dm-devel] " Christoph Hellwig
2020-11-20  8:49           ` Christoph Hellwig
2020-11-19  8:38   ` Johannes Thumshirn
2020-11-19  8:38     ` [dm-devel] " Johannes Thumshirn
2020-11-19  8:38     ` Johannes Thumshirn
2020-11-18  8:47 ` [PATCH 08/20] init: refactor devt_from_partuuid Christoph Hellwig
2020-11-18  8:47   ` [dm-devel] " Christoph Hellwig
2020-11-18  8:47   ` Christoph Hellwig
2020-11-18 14:41   ` Jan Kara
2020-11-18 14:41     ` [dm-devel] " Jan Kara
2020-11-18 14:41     ` Jan Kara
2020-11-18  8:47 ` [PATCH 09/20] init: cleanup match_dev_by_uuid and match_dev_by_label Christoph Hellwig
2020-11-18  8:47   ` [dm-devel] " Christoph Hellwig
2020-11-18  8:47   ` Christoph Hellwig
2020-11-18 14:42   ` Jan Kara
2020-11-18 14:42     ` [dm-devel] " Jan Kara
2020-11-18 14:42     ` Jan Kara
2020-11-19  8:38   ` Johannes Thumshirn
2020-11-19  8:38     ` [dm-devel] " Johannes Thumshirn
2020-11-19  8:38     ` Johannes Thumshirn
2020-11-18  8:47 ` [PATCH 10/20] block: refactor __blkdev_put Christoph Hellwig
2020-11-18  8:47   ` [dm-devel] " Christoph Hellwig
2020-11-18  8:47   ` Christoph Hellwig
2020-11-18 14:46   ` Jan Kara
2020-11-18 14:46     ` [dm-devel] " Jan Kara
2020-11-18 14:46     ` Jan Kara
2020-11-18  8:47 ` [PATCH 11/20] block: reference struct block_device from struct hd_struct Christoph Hellwig
2020-11-18  8:47   ` [dm-devel] " Christoph Hellwig
2020-11-18  8:47   ` Christoph Hellwig
2020-11-19  9:41   ` Jan Kara
2020-11-19  9:41     ` [dm-devel] " Jan Kara
2020-11-19  9:41     ` Jan Kara
2020-11-20  8:56     ` Christoph Hellwig
2020-11-20  8:56       ` [dm-devel] " Christoph Hellwig
2020-11-20  8:56       ` Christoph Hellwig
2020-11-24 16:59   ` Tejun Heo
2020-11-24 16:59     ` [dm-devel] " Tejun Heo
2020-11-24 16:59     ` Tejun Heo
2020-11-25 11:40     ` Jan Kara
2020-11-25 11:40       ` [dm-devel] " Jan Kara
2020-11-25 11:40       ` Jan Kara
2020-11-25 12:09       ` Tejun Heo
2020-11-25 12:09         ` [dm-devel] " Tejun Heo
2020-11-25 12:09         ` Tejun Heo
2020-11-18  8:47 ` [PATCH 12/20] block: simplify the block device claiming interface Christoph Hellwig
2020-11-18  8:47   ` [dm-devel] " Christoph Hellwig
2020-11-18  8:47   ` Christoph Hellwig
2020-11-19 10:07   ` Jan Kara
2020-11-19 10:07     ` [dm-devel] " Jan Kara
2020-11-19 10:07     ` Jan Kara
2020-11-18  8:47 ` [PATCH 13/20] block: remove ->bd_contains Christoph Hellwig
2020-11-18  8:47   ` [dm-devel] " Christoph Hellwig
2020-11-18  8:47   ` Christoph Hellwig
2020-11-19 10:32   ` Jan Kara
2020-11-19 10:32     ` [dm-devel] " Jan Kara
2020-11-19 10:32     ` Jan Kara
2020-11-20  9:01     ` Christoph Hellwig
2020-11-20  9:01       ` [dm-devel] " Christoph Hellwig
2020-11-20  9:01       ` Christoph Hellwig
2020-11-18  8:47 ` [PATCH 14/20] block: remove the nr_sects field in struct hd_struct Christoph Hellwig
2020-11-18  8:47   ` [dm-devel] " Christoph Hellwig
2020-11-18  8:47   ` Christoph Hellwig
2020-11-19 12:05   ` Jan Kara
2020-11-19 12:05     ` [dm-devel] " Jan Kara
2020-11-19 12:05     ` Jan Kara
2020-11-20  9:08     ` Christoph Hellwig
2020-11-20  9:08       ` [dm-devel] " Christoph Hellwig
2020-11-20  9:08       ` Christoph Hellwig
2020-11-20 11:21       ` Jan Kara
2020-11-20 11:21         ` [dm-devel] " Jan Kara
2020-11-20 11:21         ` Jan Kara
2020-11-20 15:32         ` Christoph Hellwig
2020-11-20 15:32           ` [dm-devel] " Christoph Hellwig
2020-11-20 15:32           ` Christoph Hellwig
2020-11-20 15:59           ` Matthew Wilcox
2020-11-20 15:59             ` [dm-devel] " Matthew Wilcox
2020-11-20 15:59             ` Matthew Wilcox
2020-11-20 16:01             ` Christoph Hellwig
2020-11-20 16:01               ` [dm-devel] " Christoph Hellwig
2020-11-20 16:01               ` Christoph Hellwig
2020-11-20 20:05             ` Jan Kara
2020-11-20 20:05               ` [dm-devel] " Jan Kara
2020-11-20 20:05               ` Jan Kara
2020-11-21 16:24               ` Christoph Hellwig
2020-11-21 16:24                 ` [dm-devel] " Christoph Hellwig
2020-11-21 16:24                 ` Christoph Hellwig
2020-11-18  8:47 ` [PATCH 15/20] block: merge struct block_device and " Christoph Hellwig
2020-11-18  8:47   ` [dm-devel] " Christoph Hellwig
2020-11-18  8:47   ` Christoph Hellwig
2020-11-19 14:39   ` Jan Kara
2020-11-19 14:39     ` [dm-devel] " Jan Kara
2020-11-19 14:39     ` Jan Kara
2020-11-20  9:15     ` Christoph Hellwig [this message]
2020-11-20  9:15       ` [dm-devel] " Christoph Hellwig
2020-11-20  9:15       ` Christoph Hellwig
2020-11-20 10:53       ` Jan Kara
2020-11-20 10:53         ` [dm-devel] " Jan Kara
2020-11-20 10:53         ` Jan Kara
2020-11-18  8:47 ` [PATCH 16/20] block: stop using bdget_disk for partition 0 Christoph Hellwig
2020-11-18  8:47   ` [dm-devel] " Christoph Hellwig
2020-11-18  8:47   ` Christoph Hellwig
2020-11-19 14:43   ` Jan Kara
2020-11-19 14:43     ` [dm-devel] " Jan Kara
2020-11-19 14:43     ` Jan Kara
2020-11-18  8:47 ` [PATCH 17/20] filemap: consistently use ->f_mapping over ->i_mapping Christoph Hellwig
2020-11-18  8:47   ` [dm-devel] " Christoph Hellwig
2020-11-18  8:47   ` Christoph Hellwig
2020-11-19 14:53   ` Jan Kara
2020-11-19 14:53     ` [dm-devel] " Jan Kara
2020-11-19 14:53     ` Jan Kara
2020-11-19 15:13   ` Matthew Wilcox
2020-11-19 15:13     ` [dm-devel] " Matthew Wilcox
2020-11-19 15:13     ` Matthew Wilcox
2020-11-20  9:17     ` Christoph Hellwig
2020-11-20  9:17       ` [dm-devel] " Christoph Hellwig
2020-11-20  9:17       ` Christoph Hellwig
2020-11-18  8:47 ` [PATCH 18/20] fs: remove get_super_thawed and get_super_exclusive_thawed Christoph Hellwig
2020-11-18  8:47   ` [dm-devel] " Christoph Hellwig
2020-11-18  8:47   ` Christoph Hellwig
2020-11-19 14:59   ` Jan Kara
2020-11-19 14:59     ` [dm-devel] " Jan Kara
2020-11-19 14:59     ` Jan Kara
2020-11-18  8:47 ` [PATCH 19/20] bcache: remove a superflous lookup_bdev all Christoph Hellwig
2020-11-18  8:47   ` [dm-devel] " Christoph Hellwig
2020-11-18  8:47   ` Christoph Hellwig
2020-11-18  8:54   ` Coly Li
2020-11-18  8:54     ` [dm-devel] " Coly Li
2020-11-18  8:54     ` Coly Li
2020-11-18  9:10     ` Greg KH
2020-11-18  9:10       ` [dm-devel] " Greg KH
2020-11-18  9:10       ` Greg KH
2020-11-18  9:55       ` Coly Li
2020-11-18  9:55         ` [dm-devel] " Coly Li
2020-11-18  9:55         ` Coly Li
2020-11-18 16:24     ` Christoph Hellwig
2020-11-18 16:24       ` [dm-devel] " Christoph Hellwig
2020-11-18 16:24       ` Christoph Hellwig
2020-11-18  8:48 ` [PATCH 20/20] block: remove i_bdev Christoph Hellwig
2020-11-18  8:48   ` [dm-devel] " Christoph Hellwig
2020-11-18  8:48   ` Christoph Hellwig
2020-11-18  8:56 ` merge struct block_device and struct hd_struct Jan Beulich
2020-11-18  8:56   ` [dm-devel] " Jan Beulich
2020-11-18  8:56   ` Jan Beulich
2020-11-18  8:58   ` Christoph Hellwig
2020-11-18  8:58     ` [dm-devel] " Christoph Hellwig
2020-11-18  8:58     ` Christoph Hellwig
2020-11-18  9:04     ` Jan Beulich
2020-11-18  9:04       ` [dm-devel] " Jan Beulich
2020-11-18  9:04       ` Jan Beulich
2020-11-18  9:08       ` Christoph Hellwig
2020-11-18  9:08         ` [dm-devel] " Christoph Hellwig
2020-11-18  9:08         ` Christoph Hellwig
2020-11-18  9:09       ` Greg KH
2020-11-18  9:09         ` [dm-devel] " Greg KH
2020-11-18  9:09         ` Greg KH
2020-11-18  9:23         ` Jan Beulich
2020-11-18  9:23           ` [dm-devel] " Jan Beulich
2020-11-18  9:23           ` Jan Beulich
2020-11-18  9:32           ` Greg KH
2020-11-18  9:32             ` [dm-devel] " Greg KH
2020-11-18  9:32             ` Greg KH
2020-11-18 12:50           ` Matthew Wilcox
2020-11-18 12:50             ` [dm-devel] " Matthew Wilcox
2020-11-18 12:50             ` Matthew Wilcox
2020-11-18  9:13 ` Greg KH
2020-11-18  9:13   ` [dm-devel] " Greg KH
2020-11-18  9:13   ` Greg KH

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