linux-kernel - Re: lockdep oddity

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Message-ID: <20060906071827.GB6898@osiris.boeblingen.de.ibm.com>
Date:	Wed, 6 Sep 2006 09:18:27 +0200
From:	Heiko Carstens <heiko.carstens@...ibm.com>
To:	Daniel Walker <dwalker@...sta.com>
Cc:	Andrew Morton <akpm@...l.org>, linux-kernel@...r.kernel.org,
	Ingo Molnar <mingo@...e.hu>,
	Arjan van de Ven <arjan@...radead.org>,
	Hua Zhong <hzhong@...il.com>
Subject: Re: lockdep oddity

On Tue, Sep 05, 2006 at 01:07:47PM -0700, Daniel Walker wrote:
> On Tue, 2006-09-05 at 15:03 +0200, Heiko Carstens wrote:
> > Found this will debugging some random memory corruptions that happen when
> > CONFIG_PROVE_LOCKING and CONFIG_PROFILE_LIKELY are both on.
> > Switching both off or having only one of them on seems to work.
> 
> There's potential for a some issues in current -mm , given the config
> above. If you us the generic atomic operations
> (asm-generic/bitops/atomic.h) for test_and_set_bit(). It eventually
> calls into trace_hardirqs_off() and then back into likely profiling. 
> 
> What architecture are you running this on?

This was s390. We have our own bitops and trace_hardirqs_off() won't
be called for test_and_set_bit(). Must be something different.
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