From: Heiko Carstens <heiko.carstens@de.ibm.com>
To: Ingo Molnar <mingo@elte.hu>
Cc: Arjan van de Ven <arjan@infradead.org>,
Andrew Morton <akpm@osdl.org>,
linux-kernel@vger.kernel.org,
Martin Schwidefsky <schwidefsky@de.ibm.com>
Subject: Re: [patch 7/8] lock validator: s390 use raw_spinlock in mcck handler
Date: Wed, 14 Jun 2006 20:47:57 +0200 [thread overview]
Message-ID: <20060614184757.GA10391@osiris.ibm.com> (raw)
In-Reply-To: <20060614182516.GB31243@elte.hu>
On Wed, Jun 14, 2006 at 09:25:16PM +0200, Ingo Molnar wrote:
>
> * Heiko Carstens <heiko.carstens@de.ibm.com> wrote:
>
> > From: Heiko Carstens <heiko.carstens@de.ibm.com>
> >
> > Machine checks on s390 are always enabled (except in the machine check
> > handler itself). Therefore use a raw_spinlock in the machine check
> > handler to avoid deadlocks in the lock validator.
>
> hm, couldnt you use the ->lockdep_recursion mechanism to take care of
> such cases? Just call lockdep_off() when entering a machine exception
> handler, and lockdep_on() when exiting it.
Ah, sure. Wasn't aware that there is such an interface. Will do.
prev parent reply other threads:[~2006-06-14 18:48 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-06-14 14:23 [patch 7/8] lock validator: s390 use raw_spinlock in mcck handler Heiko Carstens
2006-06-14 18:25 ` Ingo Molnar
2006-06-14 18:47 ` Heiko Carstens [this message]
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