linux-kernel - Re: [RFC][PATCH 0/2] preempt: Track unmatched preempt_enable() to preempt

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Message-ID: <20140116174536.GB9655@laptop.programming.kicks-ass.net>
Date:	Thu, 16 Jan 2014 18:45:36 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	linux-kernel@...r.kernel.org, linux-rt-users@...r.kernel.org,
	Ingo Molnar <mingo@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Clark Williams <williams@...hat.com>
Subject: Re: [RFC][PATCH 0/2] preempt: Track unmatched preempt_enable() to
 preempt_disable()

On Thu, Jan 16, 2014 at 12:18:24PM -0500, Steven Rostedt wrote:

Didn't see anything horrible in there, so fine with me.

Another thing I recently ran into was:

  local_irq_disable();
  preempt_disable();
  local_irq_enable();

  local_irq_disable();
  preempt_enable();
  local_irq_enable();

I'm not sure any of our debugging catches that, I meant to extend
lockdep, but maybe it could also be hooked into something else.
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