linux-kernel - Re: [PATCH 2/3] perf_events: fix validation of events using an extra reg (v2)

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Date:	Mon, 23 May 2011 09:47:58 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Stephane Eranian <eranian@...gle.com>
Cc:	linux-kernel@...r.kernel.org, mingo@...e.hu, andi@...stfloor.org,
	ming.m.lin@...el.com
Subject: Re: [PATCH 2/3] perf_events: fix validation of events using an
 extra reg (v2)

On Fri, 2011-05-20 at 18:45 +0200, Stephane Eranian wrote:
> On Fri, May 20, 2011 at 5:05 PM, Peter Zijlstra <peterz@...radead.org> wrote:
> > On Fri, 2011-05-20 at 16:37 +0200, Stephane Eranian wrote:
> >> The is_fake field is necessary to avoid a lockdep issue having
> >> to do with interrupt masking and era->lock.
> >
> > Why not simply disable IRQs in both validate_* functions?
> >
> Could do that too if you think that's cleaner.

Its saner than making that code path conditional, but an alternative
solution is to give the fake thing a different lock class.
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