linux-kernel - Re: [PATCH RFC v6 00/21] DEPT(Dependency Tracker)

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Message-ID: <20220510232633.GA18445@X58A-UD3R>
Date:   Wed, 11 May 2022 08:26:33 +0900
From:   Byungchul Park <byungchul.park@....com>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     Hyeonggon Yoo <42.hyeyoo@...il.com>, torvalds@...ux-foundation.org,
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Subject: Re: [PATCH RFC v6 00/21] DEPT(Dependency Tracker)

On Tue, May 10, 2022 at 10:12:54AM -0400, Steven Rostedt wrote:
> On Tue, 10 May 2022 08:38:38 +0900
> Byungchul Park <byungchul.park@....com> wrote:
> 
> > Yes, I was talking about A and L'.
> > 
> > > detect that regardless of L. A nested lock associates the the nesting with  
> > 
> > When I checked Lockdep code, L' with depth n + 1 and L' with depth n
> > have different classes in Lockdep.
> 
> If that's the case, then that's a bug in lockdep.

Yes, agree. I should've said 'Lockdep doesn't detect it currently.'
rather than 'Lockdep can't detect it.'.

I also think we make it for this case by fixing the bug in Lockdep.

> > 
> > That's why I said Lockdep cannot detect it. By any chance, has it
> > changed so as to consider this case? Or am I missing something?
> 
> No, it's not that lockdep cannot detect it, it should detect it. If it is
> not detecting it, then we need to fix that.

Yes.

	Byungchul
> 
> -- Steve