From: Dave Hansen <haveblue@us.ibm.com>
To: akpm@osdl.org
Cc: linux-kernel@vger.kernel.org, miklos@szeredi.hu,
hch@infradead.org, Dave Hansen <haveblue@us.ibm.com>
Subject: [PATCH 25/27] r-o-bind-mounts-track-number-of-mount-writers-make-lockdep-happy-with-r-o-bind-mounts
Date: Thu, 01 Nov 2007 16:09:00 -0700 [thread overview]
Message-ID: <20071101230900.13469A0F@kernel> (raw)
In-Reply-To: <20071101230826.9A4F6E00@kernel>
With the r/o bind mount patches, we can have as many
spinlocks nested as there are CPUs on the system.
Lockdep freaks out after 8.
So, create a new lockdep class of locks for the
mnt_writer spinlocks, and initialize each of the
cpu locks to be in a different class.
It should shut up warnings like this, while still
allowing some of the lockdep goodness to remain:
=============================================
[ INFO: possible recursive locking detected ]
2.6.23-rc6 #6
---
linux-2.6.git-dave/fs/namespace.c | 2 ++
1 file changed, 2 insertions(+)
diff -puN fs/namespace.c~r-o-bind-mounts-track-number-of-mount-writers-make-lockdep-happy-with-r-o-bind-mounts fs/namespace.c
--- linux-2.6.git/fs/namespace.c~r-o-bind-mounts-track-number-of-mount-writers-make-lockdep-happy-with-r-o-bind-mounts 2007-11-01 14:46:21.000000000 -0700
+++ linux-2.6.git-dave/fs/namespace.c 2007-11-01 14:46:21.000000000 -0700
@@ -112,6 +112,7 @@ struct mnt_writer {
* must be ordered by cpu number.
*/
spinlock_t lock;
+ struct lock_class_key lock_class; /* compiles out with !lockdep */
unsigned long count;
struct vfsmount *mnt;
} ____cacheline_aligned_in_smp;
@@ -123,6 +124,7 @@ static int __init init_mnt_writers(void)
for_each_possible_cpu(cpu) {
struct mnt_writer *writer = &per_cpu(mnt_writers, cpu);
spin_lock_init(&writer->lock);
+ lockdep_set_class(&writer->lock, &writer->lock_class);
writer->count = 0;
}
return 0;
_
next prev parent reply other threads:[~2007-11-01 23:17 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-11-01 23:08 [PATCH 00/27] Read-only bind mounts (-mm resend) Dave Hansen
2007-11-01 23:08 ` [PATCH 01/27] do namei_flags calculation inside open_namei() Dave Hansen
2007-11-01 23:08 ` [PATCH 02/27] make open_namei() return a filp Dave Hansen
2007-11-01 23:08 ` [PATCH 03/27] kill do_filp_open() Dave Hansen
2007-11-01 23:08 ` [PATCH 04/27] kill filp_open() Dave Hansen
2008-01-16 8:52 ` Andrew Morton
2008-01-16 17:04 ` Dave Hansen
2008-01-16 17:10 ` Christoph Hellwig
2008-01-16 17:41 ` Dave Hansen
2008-01-16 17:47 ` Christoph Hellwig
2008-01-16 17:12 ` Bryn M. Reeves
2007-11-01 23:08 ` [PATCH 05/27] rename open_namei() to open_pathname() Dave Hansen
2007-11-26 14:33 ` Christoph Hellwig
2007-11-01 23:08 ` [PATCH 06/27] r-o-bind-mounts-stub-functions Dave Hansen
2007-11-01 23:08 ` [PATCH 07/27] r-o-bind-mounts-do_rmdir-elevate-write-count Dave Hansen
2007-11-01 23:08 ` [PATCH 08/27] r-o-bind-mounts-elevate-mnt-writers-for-callers-of-vfs_mkdir Dave Hansen
2007-11-01 23:08 ` [PATCH 09/27] r-o-bind-mounts-elevate-mnt-writers-for-vfs_unlink-callers Dave Hansen
2007-11-01 23:08 ` [PATCH 10/27] r-o-bind-mounts-elevate-mount-count-for-extended-attributes Dave Hansen
2007-11-01 23:08 ` [PATCH 11/27] r-o-bind-mounts-elevate-write-count-during-entire-ncp_ioctl Dave Hansen
2007-11-01 23:08 ` [PATCH 12/27] r-o-bind-mounts-elevate-write-count-for-do_sys_utime-and-touch_atime Dave Hansen
2007-11-01 23:08 ` [PATCH 13/27] r-o-bind-mounts-elevate-write-count-for-do_utimes Dave Hansen
2007-11-01 23:08 ` [PATCH 14/27] r-o-bind-mounts-elevate-write-count-for-file_update_time Dave Hansen
2007-11-01 23:08 ` [PATCH 15/27] r-o-bind-mounts-elevate-write-count-for-link-and-symlink-calls Dave Hansen
2007-11-01 23:08 ` [PATCH 16/27] r-o-bind-mounts-elevate-write-count-for-some-ioctls Dave Hansen
2007-11-05 23:23 ` Andrew Morton
2007-11-06 9:01 ` Jan Kara
2007-11-06 9:12 ` Andrew Morton
2007-11-01 23:08 ` [PATCH 17/27] r-o-bind-mounts-elevate-write-count-opend-files Dave Hansen
2007-11-01 23:08 ` [PATCH 18/27] r-o-bind-mounts-elevate-write-count-over-calls-to-vfs_rename Dave Hansen
2007-11-01 23:08 ` [PATCH 19/27] r-o-bind-mounts-elevate-writer-count-for-chown-and-friends Dave Hansen
2007-11-01 23:08 ` [PATCH 20/27] r-o-bind-mounts-elevate-writer-count-for-do_sys_truncate Dave Hansen
2007-11-01 23:08 ` [PATCH 21/27] r-o-bind-mounts-make-access-use-mnt-check Dave Hansen
2007-11-01 23:08 ` [PATCH 22/27] r-o-bind-mounts-nfs-check-mnt-instead-of-superblock-directly Dave Hansen
2007-11-01 23:08 ` [PATCH 23/27] r-o-bind-mounts-sys_mknodat-elevate-write-count-for-vfs_mknod-create Dave Hansen
2007-11-01 23:08 ` [PATCH 24/27] r-o-bind-mounts-track-number-of-mount-writers Dave Hansen
2007-11-01 23:09 ` Dave Hansen [this message]
2007-11-05 23:35 ` [PATCH 25/27] r-o-bind-mounts-track-number-of-mount-writers-make-lockdep-happy-with-r-o-bind-mounts Andrew Morton
2007-11-01 23:09 ` [PATCH 26/27] r-o-bind-mounts-honor-r-w-changes-at-do_remount-time Dave Hansen
2007-11-01 23:09 ` [PATCH 27/27] keep track of mnt_writer state of struct file Dave Hansen
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=20071101230900.13469A0F@kernel \
--to=haveblue@us.ibm.com \
--cc=akpm@osdl.org \
--cc=hch@infradead.org \
--cc=linux-kernel@vger.kernel.org \
--cc=miklos@szeredi.hu \
/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 a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox