From: Oleg Nesterov <oleg@redhat.com>
To: Dave Chinner <david@fromorbit.com>
Cc: Jan Kara <jack@suse.cz>, Al Viro <viro@zeniv.linux.org.uk>,
Nikolay Borisov <kernel@kyup.com>,
"Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
fstests@vger.kernel.org
Subject: Re: [PATCH V2 2/2] fs/super.c: don't fool lockdep in freeze_super() and thaw_super() paths
Date: Thu, 13 Oct 2016 18:58:08 +0200 [thread overview]
Message-ID: <20161013165807.GA21138@redhat.com> (raw)
In-Reply-To: <20161010010250.GO9806@dastard>
Dave, I am sorry for delay.
On 10/10, Dave Chinner wrote:
>
> So, it's time to waste more time explaining why lockdep is telling
> us about something that *isn't a bug*.
> [... snip ...]
OK, thanks. I am not surprised although I have to admit I wasn't sure.
> Basically, what we are seeing here is yet another case of "lockdep
> is just smart enough to be really dumb" because we cannot fully
> express or cleanly annotate the contexts in which it is being asked
> to validate.
Yes... perhaps we can add the new lockdep helpers to avoid the false-
positives like this one, but so far it is not clear to me what we can do.
Somehow we need to tell it to to avoid check_prev_add() because we know
that the work function won't take sb_internal, but at the same time we
should complain if it actually does this. Lets ignore this patch for now.
Oleg.
next prev parent reply other threads:[~2016-10-13 16:59 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-09-26 16:07 [PATCH 0/2] (Was: BUG_ON in rcu_sync_func triggered) Oleg Nesterov
2016-09-26 16:07 ` [PATCH 1/2] fs/super.c: fix race between freeze_super() and thaw_super() Oleg Nesterov
2016-09-26 16:11 ` Jan Kara
2016-09-26 16:08 ` [PATCH 2/2] fs/super.c: don't fool lockdep in freeze_super() and thaw_super() paths Oleg Nesterov
2016-09-26 16:18 ` Jan Kara
2016-09-26 16:55 ` [PATCH V2 " Oleg Nesterov
2016-09-27 6:51 ` Jan Kara
2016-09-27 7:14 ` Dave Chinner
2016-09-27 17:29 ` Oleg Nesterov
2016-09-30 17:14 ` Oleg Nesterov
2016-10-02 21:42 ` Dave Chinner
2016-10-03 16:44 ` Oleg Nesterov
2016-10-04 11:43 ` Oleg Nesterov
2016-10-04 11:48 ` Michal Hocko
2016-10-06 13:44 ` Johannes Weiner
2016-10-07 16:52 ` Oleg Nesterov
2016-10-04 16:58 ` Oleg Nesterov
2016-10-04 20:03 ` Dave Chinner
2016-10-05 16:33 ` Oleg Nesterov
2016-10-04 19:44 ` Dave Chinner
2016-10-05 16:44 ` Oleg Nesterov
2016-10-06 7:27 ` Jan Kara
2016-10-06 17:17 ` Oleg Nesterov
2016-10-06 21:59 ` Dave Chinner
2016-10-07 17:15 ` Oleg Nesterov
2016-10-07 22:52 ` Dave Chinner
2016-10-09 16:14 ` Oleg Nesterov
2016-10-10 1:02 ` Dave Chinner
2016-10-13 16:58 ` Oleg Nesterov [this message]
2016-10-13 17:10 ` [PATCH 0/2] (Was: BUG_ON in rcu_sync_func triggered) Oleg Nesterov
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=20161013165807.GA21138@redhat.com \
--to=oleg@redhat.com \
--cc=david@fromorbit.com \
--cc=fstests@vger.kernel.org \
--cc=jack@suse.cz \
--cc=kernel@kyup.com \
--cc=linux-fsdevel@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=paulmck@linux.vnet.ibm.com \
--cc=viro@zeniv.linux.org.uk \
/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.