linux-kernel - Re: [PATCH -v4 6/8] locking/mutex: Restructure wait loop

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Message-ID: <20161017154938.GV3142@twins.programming.kicks-ass.net>
Date:   Mon, 17 Oct 2016 17:49:38 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Boqun Feng <boqun.feng@...il.com>
Cc:     Will Deacon <will.deacon@....com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Waiman Long <waiman.long@....com>,
        Jason Low <jason.low2@....com>,
        Ding Tianhong <dingtianhong@...wei.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        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>,
        Jason Low <jason.low2@...com>,
        Chris Wilson <chris@...is-wilson.co.uk>,
        Daniel Vetter <daniel.vetter@...ll.ch>
Subject: Re: [PATCH -v4 6/8] locking/mutex: Restructure wait loop

On Mon, Oct 17, 2016 at 09:45:01PM +0800, Boqun Feng wrote:
> But __mutex_set_flag() and __mutex_trylock() actually touch the same
> atomic word? So we don't need extra things to order them?

Right.. in any case brain is confused. I'll look again at it later.