From: Sven Eckelmann <sven@narfation.org>
To: Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@redhat.com>,
linux-kernel@vger.kernel.org
Cc: simon.wunderlich@s2003.tu-chemnitz.de,
Marek Lindner <lindner_marek@yahoo.de>
Subject: Using nested locking for spin_lock_bh
Date: Wed, 28 Mar 2012 18:36:39 +0200 [thread overview]
Message-ID: <2108147.Aqyix6xDmB@bentobox> (raw)
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Hi,
I started to run some experimental batman-adv code inside some virtual
machines with different debugging functions enabled. One of them was lockdep.
There we noticed a false positive for a lock class that is actually used in
two different data structures. Therefore, lockdep noticed that there could be
a deadlock for this class in a function that locks the two different data
structures.
To resolve this problem, I wanted to define two different subclasses and
replace the spin_lock_bh with its nested version. The only problem now is the
absence of spin_lock_bh_nested. I could only find spin_lock_bh and
spin_lock_irqsave_nested.
Is there another way how this should be done or is there a general problem why
there is no nested support for this incarnation of spin_lock?
Kind regards,
Sven
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next reply other threads:[~2012-03-28 16:44 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-03-28 16:36 Sven Eckelmann [this message]
2012-03-29 3:11 ` Using nested locking for spin_lock_bh Yong Zhang
2012-03-29 10:41 ` Sven Eckelmann
2012-04-15 11:18 ` Peter Zijlstra
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