All of lore.kernel.org
 help / color / mirror / Atom feed
From: NeilBrown <neilb@suse.com>
To: Keith Busch <keith.busch@intel.com>,
	Maxim Levitsky <maximlevitsky@gmail.com>,
	Vishal Verma <vishal.l.verma@intel.com>,
	Jens Axboe <axboe@fb.com>,
	Dan Williams <dan.j.williams@intel.com>,
	Ross Zwisler <ross.zwisler@linux.intel.com>
Cc: linux-kernel@vger.kernel.org, linux-nvme@lists.infradead.org,
	linux-nvdimm@lists.01.org
Subject: [PATCH 2/4] nvdimm/btt: don't allocate unused major device number
Date: Thu, 10 Mar 2016 08:59:28 +1100	[thread overview]
Message-ID: <20160309215928.20904.21111.stgit@noble> (raw)
In-Reply-To: <20160309215702.20904.61407.stgit@noble>

alloc_disk(0) does not require or use a ->major number,
all devices are allocated with a major of BLOCK_EXT_MAJOR.

So don't allocate btt_major.

Signed-off-by: NeilBrown <neilb@suse.com>
---
 drivers/nvdimm/btt.c |   19 ++-----------------
 1 file changed, 2 insertions(+), 17 deletions(-)

diff --git a/drivers/nvdimm/btt.c b/drivers/nvdimm/btt.c
index efb2c1ceef98..c32cbb593600 100644
--- a/drivers/nvdimm/btt.c
+++ b/drivers/nvdimm/btt.c
@@ -31,8 +31,6 @@ enum log_ent_request {
 	LOG_OLD_ENT
 };
 
-static int btt_major;
-
 static int arena_read_bytes(struct arena_info *arena, resource_size_t offset,
 		void *buf, size_t n)
 {
@@ -1246,7 +1244,6 @@ static int btt_blk_init(struct btt *btt)
 
 	nvdimm_namespace_disk_name(ndns, btt->btt_disk->disk_name);
 	btt->btt_disk->driverfs_dev = &btt->nd_btt->dev;
-	btt->btt_disk->major = btt_major;
 	btt->btt_disk->first_minor = 0;
 	btt->btt_disk->fops = &btt_fops;
 	btt->btt_disk->private_data = btt;
@@ -1423,22 +1420,11 @@ EXPORT_SYMBOL(nvdimm_namespace_detach_btt);
 
 static int __init nd_btt_init(void)
 {
-	int rc;
-
-	btt_major = register_blkdev(0, "btt");
-	if (btt_major < 0)
-		return btt_major;
+	int rc = 0;
 
 	debugfs_root = debugfs_create_dir("btt", NULL);
-	if (IS_ERR_OR_NULL(debugfs_root)) {
+	if (IS_ERR_OR_NULL(debugfs_root))
 		rc = -ENXIO;
-		goto err_debugfs;
-	}
-
-	return 0;
-
- err_debugfs:
-	unregister_blkdev(btt_major, "btt");
 
 	return rc;
 }
@@ -1446,7 +1432,6 @@ static int __init nd_btt_init(void)
 static void __exit nd_btt_exit(void)
 {
 	debugfs_remove_recursive(debugfs_root);
-	unregister_blkdev(btt_major, "btt");
 }
 
 MODULE_ALIAS_ND_DEVICE(ND_DEVICE_BTT);


_______________________________________________
Linux-nvdimm mailing list
Linux-nvdimm@lists.01.org
https://lists.01.org/mailman/listinfo/linux-nvdimm

WARNING: multiple messages have this Message-ID (diff)
From: neilb@suse.com (NeilBrown)
Subject: [PATCH 2/4] nvdimm/btt: don't allocate unused major device number
Date: Thu, 10 Mar 2016 08:59:28 +1100	[thread overview]
Message-ID: <20160309215928.20904.21111.stgit@noble> (raw)
In-Reply-To: <20160309215702.20904.61407.stgit@noble>

alloc_disk(0) does not require or use a ->major number,
all devices are allocated with a major of BLOCK_EXT_MAJOR.

So don't allocate btt_major.

Signed-off-by: NeilBrown <neilb at suse.com>
---
 drivers/nvdimm/btt.c |   19 ++-----------------
 1 file changed, 2 insertions(+), 17 deletions(-)

diff --git a/drivers/nvdimm/btt.c b/drivers/nvdimm/btt.c
index efb2c1ceef98..c32cbb593600 100644
--- a/drivers/nvdimm/btt.c
+++ b/drivers/nvdimm/btt.c
@@ -31,8 +31,6 @@ enum log_ent_request {
 	LOG_OLD_ENT
 };
 
-static int btt_major;
-
 static int arena_read_bytes(struct arena_info *arena, resource_size_t offset,
 		void *buf, size_t n)
 {
@@ -1246,7 +1244,6 @@ static int btt_blk_init(struct btt *btt)
 
 	nvdimm_namespace_disk_name(ndns, btt->btt_disk->disk_name);
 	btt->btt_disk->driverfs_dev = &btt->nd_btt->dev;
-	btt->btt_disk->major = btt_major;
 	btt->btt_disk->first_minor = 0;
 	btt->btt_disk->fops = &btt_fops;
 	btt->btt_disk->private_data = btt;
@@ -1423,22 +1420,11 @@ EXPORT_SYMBOL(nvdimm_namespace_detach_btt);
 
 static int __init nd_btt_init(void)
 {
-	int rc;
-
-	btt_major = register_blkdev(0, "btt");
-	if (btt_major < 0)
-		return btt_major;
+	int rc = 0;
 
 	debugfs_root = debugfs_create_dir("btt", NULL);
-	if (IS_ERR_OR_NULL(debugfs_root)) {
+	if (IS_ERR_OR_NULL(debugfs_root))
 		rc = -ENXIO;
-		goto err_debugfs;
-	}
-
-	return 0;
-
- err_debugfs:
-	unregister_blkdev(btt_major, "btt");
 
 	return rc;
 }
@@ -1446,7 +1432,6 @@ static int __init nd_btt_init(void)
 static void __exit nd_btt_exit(void)
 {
 	debugfs_remove_recursive(debugfs_root);
-	unregister_blkdev(btt_major, "btt");
 }
 
 MODULE_ALIAS_ND_DEVICE(ND_DEVICE_BTT);

WARNING: multiple messages have this Message-ID (diff)
From: NeilBrown <neilb@suse.com>
To: Keith Busch <keith.busch@intel.com>,
	Maxim Levitsky <maximlevitsky@gmail.com>,
	Vishal Verma <vishal.l.verma@intel.com>,
	Jens Axboe <axboe@fb.com>,
	Dan Williams <dan.j.williams@intel.com>,
	Ross Zwisler <ross.zwisler@linux.intel.com>
Cc: linux-nvme@lists.infradead.org, linux-kernel@vger.kernel.org,
	linux-nvdimm@ml01.01.org
Subject: [PATCH 2/4] nvdimm/btt: don't allocate unused major device number
Date: Thu, 10 Mar 2016 08:59:28 +1100	[thread overview]
Message-ID: <20160309215928.20904.21111.stgit@noble> (raw)
In-Reply-To: <20160309215702.20904.61407.stgit@noble>

alloc_disk(0) does not require or use a ->major number,
all devices are allocated with a major of BLOCK_EXT_MAJOR.

So don't allocate btt_major.

Signed-off-by: NeilBrown <neilb@suse.com>
---
 drivers/nvdimm/btt.c |   19 ++-----------------
 1 file changed, 2 insertions(+), 17 deletions(-)

diff --git a/drivers/nvdimm/btt.c b/drivers/nvdimm/btt.c
index efb2c1ceef98..c32cbb593600 100644
--- a/drivers/nvdimm/btt.c
+++ b/drivers/nvdimm/btt.c
@@ -31,8 +31,6 @@ enum log_ent_request {
 	LOG_OLD_ENT
 };
 
-static int btt_major;
-
 static int arena_read_bytes(struct arena_info *arena, resource_size_t offset,
 		void *buf, size_t n)
 {
@@ -1246,7 +1244,6 @@ static int btt_blk_init(struct btt *btt)
 
 	nvdimm_namespace_disk_name(ndns, btt->btt_disk->disk_name);
 	btt->btt_disk->driverfs_dev = &btt->nd_btt->dev;
-	btt->btt_disk->major = btt_major;
 	btt->btt_disk->first_minor = 0;
 	btt->btt_disk->fops = &btt_fops;
 	btt->btt_disk->private_data = btt;
@@ -1423,22 +1420,11 @@ EXPORT_SYMBOL(nvdimm_namespace_detach_btt);
 
 static int __init nd_btt_init(void)
 {
-	int rc;
-
-	btt_major = register_blkdev(0, "btt");
-	if (btt_major < 0)
-		return btt_major;
+	int rc = 0;
 
 	debugfs_root = debugfs_create_dir("btt", NULL);
-	if (IS_ERR_OR_NULL(debugfs_root)) {
+	if (IS_ERR_OR_NULL(debugfs_root))
 		rc = -ENXIO;
-		goto err_debugfs;
-	}
-
-	return 0;
-
- err_debugfs:
-	unregister_blkdev(btt_major, "btt");
 
 	return rc;
 }
@@ -1446,7 +1432,6 @@ static int __init nd_btt_init(void)
 static void __exit nd_btt_exit(void)
 {
 	debugfs_remove_recursive(debugfs_root);
-	unregister_blkdev(btt_major, "btt");
 }
 
 MODULE_ALIAS_ND_DEVICE(ND_DEVICE_BTT);

  parent reply	other threads:[~2016-03-09 22:05 UTC|newest]

Thread overview: 39+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-03-09 21:59 [PATCH 0/4] Remove un-needed 'major' registration when alloc_disk(0) is used NeilBrown
2016-03-09 21:59 ` NeilBrown
2016-03-09 21:59 ` NeilBrown
2016-03-09 21:59 ` [PATCH 4/4] NVMe: don't allocate unused nvme_major NeilBrown
2016-03-09 21:59   ` NeilBrown
2016-03-09 21:59   ` NeilBrown
2016-03-10  9:06   ` Johannes Thumshirn
2016-03-10  9:06     ` Johannes Thumshirn
2016-03-10  9:06     ` Johannes Thumshirn
2016-03-09 21:59 ` NeilBrown [this message]
2016-03-09 21:59   ` [PATCH 2/4] nvdimm/btt: don't allocate unused major device number NeilBrown
2016-03-09 21:59   ` NeilBrown
2016-03-10  9:05   ` Johannes Thumshirn
2016-03-10  9:05     ` Johannes Thumshirn
2016-03-10  9:05     ` Johannes Thumshirn
2016-03-09 21:59 ` [PATCH 1/4] nvdimm/blk: " NeilBrown
2016-03-09 21:59   ` NeilBrown
2016-03-09 21:59   ` NeilBrown
2016-03-10  9:05   ` Johannes Thumshirn
2016-03-10  9:05     ` Johannes Thumshirn
2016-03-10  9:05     ` Johannes Thumshirn
2016-03-09 21:59 ` [PATCH 3/4] memstick: don't allocate unused major for ms_block NeilBrown
2016-03-09 21:59   ` NeilBrown
2016-03-09 21:59   ` NeilBrown
2016-03-10  9:06   ` Johannes Thumshirn
2016-03-10  9:06     ` Johannes Thumshirn
2016-03-10  9:06     ` Johannes Thumshirn
2016-03-09 23:35 ` [PATCH 0/4] Remove un-needed 'major' registration when alloc_disk(0) is used Dan Williams
2016-03-09 23:35   ` Dan Williams
2016-03-09 23:35   ` Dan Williams
2016-03-14 22:50 ` Ross Zwisler
2016-03-14 22:50   ` Ross Zwisler
2016-03-14 22:50   ` Ross Zwisler
2016-03-15 22:15   ` NeilBrown
2016-03-15 22:15     ` NeilBrown
2016-03-15 22:15     ` NeilBrown
2016-03-16  0:20     ` Jens Axboe
2016-03-16  0:20       ` Jens Axboe
2016-03-16  0:20       ` Jens Axboe

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20160309215928.20904.21111.stgit@noble \
    --to=neilb@suse.com \
    --cc=axboe@fb.com \
    --cc=dan.j.williams@intel.com \
    --cc=keith.busch@intel.com \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-nvdimm@lists.01.org \
    --cc=linux-nvme@lists.infradead.org \
    --cc=maximlevitsky@gmail.com \
    --cc=ross.zwisler@linux.intel.com \
    --cc=vishal.l.verma@intel.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.