linux-kernel - Re: Fix for genalloc locking

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Message-Id: <20081021083949.3b1473c8.randy.dunlap@oracle.com>
Date:	Tue, 21 Oct 2008 08:39:49 -0700
From:	Randy Dunlap <randy.dunlap@...cle.com>
To:	Iwo Mergler <iwo@...l-direct.com.au>
Cc:	linux-kernel@...r.kernel.org, Jes Sorensen <jes@...ined-monkey.org>
Subject: Re: Fix for genalloc locking

On Fri, 17 Oct 2008 16:43:12 +1000 Iwo Mergler wrote:

> Hi,
> 
> I hit a little problem while using genalloc with a mix
> of interrupt/non-interrupt context. I believe the correct
> fix is to replace the locking calls with the _irqsave/_irqrestore
> variants. Patch follows.
> 
> Is this correct?
> 
> BTW, is there any documentation on the Lockdep warnings?
> What exactly is the meaning of {--+.} in 
> 
> (&pool->lock){--+.}, at: [<c0125d1c>] gen_pool_free+0x34/0x120

Did you read Documentation/lockdep-design.txt ?

---
~Randy
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