From: peterz@infradead.org (Peter Zijlstra)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH] arm: Use arch_spin_lock for unwind to avoid lockdep deadlock
Date: Tue, 17 May 2011 16:20:21 +0200 [thread overview]
Message-ID: <1305642021.2466.5799.camel@twins> (raw)
In-Reply-To: <alpine.LFD.2.02.1105171605080.3078@ionos>
On Tue, 2011-05-17 at 16:11 +0200, Thomas Gleixner wrote:
> When lockdep traces a lock taken in a module the arm unwinder takes
> unwind_lock which causes a recursive lockdep call deadlocking itself
> on the unwind_lock.
>
> Make unwind_lock an arch_spin_lock to avoid the lockdep call and use
> the raw_local_irq_save/restore() variants to avoid irq tracing as
> well.
That doesn't parse, lockdep has recursion protection, this shouldn't
happen.
next prev parent reply other threads:[~2011-05-17 14:20 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-05-17 14:11 [PATCH] arm: Use arch_spin_lock for unwind to avoid lockdep deadlock Thomas Gleixner
2011-05-17 14:20 ` Peter Zijlstra [this message]
2011-05-17 15:45 ` Thomas Gleixner
2011-05-17 19:31 ` Thomas Gleixner
2011-05-17 15:26 ` Catalin Marinas
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