linux-kernel - Re: [PATCH 1/7] lockdep: Print a nice description of an irq locking issue

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Message-ID: <BANLkTikBk2n8x1gJBHHrpxZZrhEpVFxt4A@mail.gmail.com>
Date:	Fri, 22 Apr 2011 09:41:40 +0800
From:	Yong Zhang <yong.zhang0@...il.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [PATCH 1/7] lockdep: Print a nice description of an irq locking issue

On Thu, Apr 21, 2011 at 10:24 PM, Steven Rostedt <rostedt@...dmis.org> wrote:
> On Thu, 2011-04-21 at 21:35 +0800, Yong Zhang wrote:
>> On Thu, Apr 21, 2011 at 07:40:29AM -0400, Steven Rostedt wrote:
>
>> > I
>> > could show the entire chain too.
>>
>> Sure :)
>
> I talked a little about this with Peter Zijlstra on IRC, and we agreed
> that we'll keep this as is until we notice that kernel developers are
> still confused with the output.

OK :)

>
> The more advanced I make this output, the more likely I'll make a
> mistake and show something that is not what actually happens. I wrote a
> module to trigger each of these cases and the problems that lockdep can
> detect grows exponentially as we make the output more specific.
>
> I probably should modify the lockdep selftests to add an option to show
> the output as well as it triggers errors. This would allow me to make
> sure the output still works.

This does make sense to keep things consistent if we have it.

>
> But for now, I have other things to work on ;)

If you want, you can show more details on your ideas,
maybe I could get some time to finish it :)

Thanks,
Yong



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