linux-kernel - Re: [PATCH -v4 1/8] locking/drm: Kill mutex trickery

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Message-ID: <20161007161314.GD3142@twins.programming.kicks-ass.net>
Date:   Fri, 7 Oct 2016 18:13:14 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Waiman Long <waiman.long@....com>, Jason Low <jason.low2@....com>,
        Ding Tianhong <dingtianhong@...wei.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Will Deacon <Will.Deacon@....com>,
        Ingo Molnar <mingo@...hat.com>,
        Imre Deak <imre.deak@...el.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Davidlohr Bueso <dave@...olabs.net>,
        Tim Chen <tim.c.chen@...ux.intel.com>,
        Terry Rudd <terry.rudd@....com>,
        "Paul E. McKenney" <paulmck@...ibm.com>,
        Chris Wilson <chris@...is-wilson.co.uk>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        Rob Clark <robdclark@...il.com>
Subject: Re: [PATCH -v4 1/8] locking/drm: Kill mutex trickery

On Fri, Oct 07, 2016 at 08:58:43AM -0700, Linus Torvalds wrote:
> Ugh. I think the concept is fine, but can we place make these enum's
> be all upper case or something to make them really stand out visually.

OK.

> The other choice would be to just make the choices be negative (==
> recursive), zero (== failed) or positive (== got lock), which allows
> for the same value re-use for the non-recursive case, and you could
> avoid the enum entirely.

I thought about that, but liked the enum better for having to then spell
it out.

I'll go make the enum shout and add comment as you suggest.