linux-kernel - Re: lockdep oddity

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Message-Id: <1157486867.22250.9.camel@dwalker1.mvista.com>
Date:	Tue, 05 Sep 2006 13:07:47 -0700
From:	Daniel Walker <dwalker@...sta.com>
To:	Heiko Carstens <heiko.carstens@...ibm.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, 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?

Daniel

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