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

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Date:	Wed, 27 Mar 2013 13:02:56 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Michel Lespinasse <walken@...gle.com>
Cc:	Rik van Riel <riel@...riel.com>,
	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, Ingo Molnar <mingo@...hat.com>
Subject: Re: [PATCH -mm -next] ipc,sem: fix lockdep false positive

On Wed, 2013-03-27 at 04:22 -0700, Michel Lespinasse wrote:
> >> Not without breaking your scheme above :)
> >
> > How would making sma->global_lock a mutex wreck anything?
> 
> I don't remember the details (rik probably will), but rcu is also
> already involved, so there is a non trivial chance that it would...

Ah, that might be true, the callsite might not be able to deal with it,
but the proposed global/local lock thing doesn't care -- which is how I
read Rik's comment above.

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