linux-kernel - Re: [PATCH v2 08/17] locking/lockdep: Add support for nestable terminal locks

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Date:   Fri, 7 Dec 2018 10:22:52 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Waiman Long <longman@...hat.com>
Cc:     Ingo Molnar <mingo@...hat.com>, Will Deacon <will.deacon@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-kernel@...r.kernel.org, kasan-dev@...glegroups.com,
        linux-mm@...ck.org, iommu@...ts.linux-foundation.org,
        Petr Mladek <pmladek@...e.com>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Tejun Heo <tj@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH v2 08/17] locking/lockdep: Add support for nestable
 terminal locks

On Mon, Nov 19, 2018 at 01:55:17PM -0500, Waiman Long wrote:
> There are use cases where we want to allow nesting of one terminal lock
> underneath another terminal-like lock. That new lock type is called
> nestable terminal lock which can optionally allow the acquisition of
> no more than one regular (non-nestable) terminal lock underneath it.

I think I asked for a more coherent changelog on this. The above is
still self contradictory and doesn't explain why you'd ever want such a
'misfeature' :-)