linux-kernel - Re: [RFC PATCH 07/12] locking/lockdep: Add support for nested terminal locks

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Message-ID: <20181110142023.GG3339@worktop.programming.kicks-ass.net>
Date:   Sat, 10 Nov 2018 15:20:23 +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, 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: [RFC PATCH 07/12] locking/lockdep: Add support for nested
 terminal locks

On Thu, Nov 08, 2018 at 03:34:23PM -0500, Waiman Long wrote:
> There are use cases where we want to allow 2-level nesting of one
> terminal lock underneath another one. So the terminal lock type is now
> extended to support a new nested terminal lock where it can allow the
> acquisition of another regular terminal lock underneath it.

You're stretching things here... If you're allowing things under it, it
is no longer a terminal lock.

Why would you want to do such a thing?