linux-kernel - Re: [PATCH -mm -next] ipc,sem: fix lockdep false positive

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Message-ID: <CANN689G5dGv2Hn2epbG8Pi8=bH=Lmz0hHxCS405FbPBvwDJ=gg@mail.gmail.com>
Date:	Mon, 25 Mar 2013 14:51:19 -0700
From:	Michel Lespinasse <walken@...gle.com>
To:	Rik van Riel <riel@...riel.com>
Cc:	Sasha Levin <sasha.levin@...cle.com>,
	torvalds@...ux-foundation.org, davidlohr.bueso@...com,
	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	hhuang@...hat.com, jason.low2@...com, lwoodman@...hat.com,
	chegu_vinod@...com, Dave Jones <davej@...hat.com>,
	benisty.e@...il.com, Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>
Subject: Re: [PATCH -mm -next] ipc,sem: fix lockdep false positive

On Mon, Mar 25, 2013 at 2:42 PM, Michel Lespinasse <walken@...gle.com> wrote:
> I'll be surprised if it does, because we don't actually have single
> depth nesting here...
> Adding Peter & Ingo for advice about how to proceed
> (the one solution I know would involve using arch_spin_lock() directly
> to bypass the lockdep checks, but there's got to be a better way...)

Maybe spin_lock_nest_lock() can help too. I'm not sure, the feature is
undocumented.

-- 
Michel "Walken" Lespinasse
A program is never fully debugged until the last user dies.
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