linux-kernel - [PATCH v2] Make lockdep happy with configfs

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Message-Id: <1233166713-9668-1-git-send-email-louis.rilling@kerlabs.com>
Date:	Wed, 28 Jan 2009 19:18:31 +0100
From:	Louis Rilling <louis.rilling@...labs.com>
To:	Joel Becker <Joel.Becker@...cle.com>
Cc:	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	cluster-devel@...hat.com, swhiteho@...hat.com, peterz@...radead.org
Subject: [PATCH v2] Make lockdep happy with configfs


Hi Joel,

Here is a revised version of the patchset making lockdep happy with configfs.
I still don't have a good setup to test the second patch beyond compilation, and
I still guess that you have one :)

Louis

Changelog:
- put s_depth logic in separate functions and remove #ifdef LOCKDEP in the
  hooked functions.
- added the following note to explain why configfs_depend_prep() is correct
  when examining attaching items:
+ * Note: items in the middle of attachment start with s_type = 0
+ * (configfs_new_dirent()), and configfs_make_dirent() (called from
+ * create_dir()) sets s_type = CONFIGFS_DIR|CONFIGFS_USET_CREATING. In both
+ * cases the item is ignored. Since s_type is an int, we rely on the CPU to
+ * atomically update the value, without making configfs_make_dirent() take
+ * configfs_dirent_lock.

- fixed parenthesis on pattern !a & b && c --> !(a & b) && c
- quiet checkpatch

Louis Rilling (2):
      configfs: Silence lockdep on mkdir() and rmdir()
      configfs: Rework configfs_depend_item() locking and make lockdep happy

 fs/configfs/configfs_internal.h |    3 +
 fs/configfs/dir.c               |  188 ++++++++++++++++++++++++++++-----------
 fs/configfs/inode.c             |   38 ++++++++
 3 files changed, 175 insertions(+), 54 deletions(-)
-- 
Dr Louis Rilling			Kerlabs
Skype: louis.rilling			Batiment Germanium
Phone: (+33|0) 6 80 89 08 23		80 avenue des Buttes de Coesmes
http://www.kerlabs.com/			35700 Rennes
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