linux-kernel - Re: acquire_console_mutex: WARNING: at 2.6.33.4-rt20/kernel/mutex-debug.c:65 mutex_remove

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Message-Id: <201005311329.07182.arnd@arndb.de>
Date:	Mon, 31 May 2010 13:29:07 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Olaf Hering <olaf@...fle.de>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: acquire_console_mutex: WARNING: at 2.6.33.4-rt20/kernel/mutex-debug.c:65 mutex_remove_waiter+0xe8/0x11c()

On Sunday 30 May 2010, Olaf Hering wrote:
> > You could try to pull in the blk/tty branch from
> > http://git.kernel.org/?p=linux/kernel/git/arnd/playground.git and enable
> > CONFIG_TTY_MUTEX to see if that gives you better lockdep output,
> > because that replaces the implicit dropping of the BKL with mutex operations
> > that lockdep is aware of.
> 
> CONFIG_TTY_MUTEX depends on SMP and this ARM system does not support
> CONFIG_SMP, its hidden by Kconfig dependencies.
> 
Ah right, sorry about that.

It should be

	depends on SMP || PREEMPT

	Arnd


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