linux-kernel - Re: [PATCH 03/32] locking/lockdep: lockdep_set_no_check

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Message-ID: <ZFqlmrL27is3AofY@moria.home.lan>
Date:   Tue, 9 May 2023 15:57:14 -0400
From:   Kent Overstreet <kent.overstreet@...ux.dev>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-bcachefs@...r.kernel.org, Ingo Molnar <mingo@...hat.com>,
        Will Deacon <will@...nel.org>,
        Waiman Long <longman@...hat.com>,
        Boqun Feng <boqun.feng@...il.com>
Subject: Re: [PATCH 03/32] locking/lockdep: lockdep_set_no_check_recursion()

On Tue, May 09, 2023 at 09:31:47PM +0200, Peter Zijlstra wrote:
> On Tue, May 09, 2023 at 12:56:28PM -0400, Kent Overstreet wrote:
> > This adds a method to tell lockdep not to check lock ordering within a
> > lock class - but to still check lock ordering w.r.t. other lock types.
> > 
> > This is for bcachefs, where for btree node locks we have our own
> > deadlock avoidance strategy w.r.t. other btree node locks (cycle
> > detection), but we still want lockdep to check lock ordering w.r.t.
> > other lock types.
> > 
> 
> ISTR you had a much nicer version of this where you gave a custom order
> function -- what happend to that?

Probably in the other branch that I was meaning to re-mail you separately,
clearly I hadn't pulled the latest versions back into here... expect
that shortly :)