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From:   Thomas Gleixner <tglx@linutronix.de>
To:     Steven Rostedt <rostedt@goodmis.org>,
        Ingo Molnar <mingo@kernel.org>
Cc:     Byungchul Park <byungchul.park@lge.com>,
        torvalds@linux-foundation.org, peterz@infradead.org,
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        duyuyang@gmail.com, johannes.berg@intel.com, tj@kernel.org,
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        gregkh@linuxfoundation.org, kernel-team@lge.com
Subject: Re: [RFC] Are you good with Lockdep?
In-Reply-To: <20201111093609.1bd2b637@gandalf.local.home>
References: <20201111050559.GA24438@X58A-UD3R> <20201111105441.GA78848@gmail.com> <20201111093609.1bd2b637@gandalf.local.home>
Date:   Thu, 12 Nov 2020 00:16:50 +0100
Message-ID: <87d00jo55p.fsf@nanos.tec.linutronix.de>
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On Wed, Nov 11 2020 at 09:36, Steven Rostedt wrote:
> Ingo Molnar <mingo@kernel.org> wrote:
>> Not sure I understand the "problem 2)" outlined here, but I'm looking 
>> forward to your patchset!
>> 
> I think I understand it. For things like completions and other "wait for
> events" we have lockdep annotation, but it is rather awkward to implement.
> Having something that says "lockdep_wait_event()" and
> "lockdep_exec_event()" wrappers would be useful.

Wrappers which make things simpler are always useful, but the lack of
wrappers does not justify a wholesale replacement.

We all know that lockdep has limitations but I yet have to see a proper
argument why this can't be solved incrementaly on top of the existing
infrastructure.

That said, I'm not at all interested in a wholesale replacement of
lockdep which will take exactly the same amount of time to stabilize and
weed out the shortcomings again.

Thanks,

        tglx