linux-kernel - Re: Fix false positive by LOCKDEP

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Message-ID: <1508336995.2923.2.camel@wdc.com>
Date:   Wed, 18 Oct 2017 14:29:56 +0000
From:   Bart Van Assche <Bart.VanAssche@....com>
To:     "mingo@...nel.org" <mingo@...nel.org>,
        "peterz@...radead.org" <peterz@...radead.org>,
        "byungchul.park@....com" <byungchul.park@....com>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "amir73il@...il.com" <amir73il@...il.com>,
        "linux-block@...r.kernel.org" <linux-block@...r.kernel.org>,
        "hch@...radead.org" <hch@...radead.org>,
        "linux-xfs@...r.kernel.org" <linux-xfs@...r.kernel.org>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "oleg@...hat.com" <oleg@...hat.com>,
        "darrick.wong@...cle.com" <darrick.wong@...cle.com>,
        "johannes.berg@...el.com" <johannes.berg@...el.com>,
        "linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
        "idryomov@...il.com" <idryomov@...il.com>,
        "tj@...nel.org" <tj@...nel.org>,
        "kernel-team@....com" <kernel-team@....com>,
        "david@...morbit.com" <david@...morbit.com>
Subject: Re: Fix false positive by LOCKDEP_CROSSRELEASE

On Wed, 2017-10-18 at 18:38 +0900, Byungchul Park wrote:
> Several false positives were reported, so I tried to fix them.
> 
> It would be appreciated if you tell me if it works as expected, or let
> me know your opinion.

What I have been wondering about is whether the crosslock checking makes
sense from a conceptual point of view. I tried to find documentation for the
crosslock checking in Documentation/locking/lockdep-design.txt but
couldn't find a description of the crosslock checking. Shouldn't it be
documented somewhere what the crosslock checks do and what the theory is
behind these checks?

Bart.