linux-kernel - Re: lockdep warning after recent cleanup in console code

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Message-ID: <20140428201305.GG9091@quack.suse.cz>
Date:	Mon, 28 Apr 2014 22:13:05 +0200
From:	Jan Kara <jack@...e.cz>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Jan Kara <jack@...e.cz>, Peter Zijlstra <peterz@...radead.org>,
	"Shevchenko, Andriy" <andriy.shevchenko@...el.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...nel.org>
Subject: Re: lockdep warning after recent cleanup in console code

On Mon 28-04-14 15:36:42, Steven Rostedt wrote:
> On Mon, 28 Apr 2014 21:24:16 +0200
> Jan Kara <jack@...e.cz> wrote:
> 
> 
> >   So I had a look and we are missing mutex_release() in
> > console_trylock_for_printk() if we don't have a console to print to.
> > Attached patch should fix the problem.
> > 
> 
> Note, your patch changes the logic a bit. It causes the
> mutex_acquire(&console_lock_dep_map) to happen on console_suspend,
> which the original code never did.
  Yes, I know. That's actually intentional and also fixes a lockdep warning
- there was a separate patch doing exactly that flying around because
otherwise when you suspend-resume & CPU hotplug, lockdep complains because
of some cpu hotplug locks. Maybe I should note that in a changelog.

								Honza
-- 
Jan Kara <jack@...e.cz>
SUSE Labs, CR
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