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Message-ID: <1471539134.28391.64.camel@intel.com>
Subject: Re: [PATCH v5 3/3] locking/mutex: Ensure forward progress of
 waiter-spinner
From: Imre Deak <imre.deak@intel.com>
Reply-To: imre.deak@intel.com
To: Peter Zijlstra <peterz@infradead.org>,
        Waiman Long <waiman.long@hpe.com>
Cc: Ingo Molnar <mingo@redhat.com>, linux-kernel@vger.kernel.org,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Ding Tianhong <dingtianhong@huawei.com>,
        Jason Low <jason.low2@hpe.com>, Davidlohr Bueso <dave@stgolabs.net>,
        "Paul E. McKenney" <paulmck@us.ibm.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        Will Deacon <Will.Deacon@arm.com>,
        Tim Chen <tim.c.chen@linux.intel.com>
Date: Thu, 18 Aug 2016 19:52:14 +0300
In-Reply-To: <20160818155829.GA10138@twins.programming.kicks-ass.net>
References: <1470853530-37540-1-git-send-email-Waiman.Long@hpe.com>
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         <57AC9347.1060105@hpe.com>
         <20160818155829.GA10138@twins.programming.kicks-ass.net>
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On to, 2016-08-18 at 17:58 +0200, Peter Zijlstra wrote:
> On Thu, Aug 11, 2016 at 11:01:27AM -0400, Waiman Long wrote:
> > The following is the updated patch that should fix the build error
> > in
> > non-x86 platform.
> > 
> 
> This patch was whitespace challenged, but I think I munged it
> properly.
> 
> I've also stuck something based on Jason's patch on top. Please have
> a
> look at:
> 
>   https://git.kernel.org/cgit/linux/kernel/git/peterz/queue.git/log/?
> h=locking/core
> 
> compile tested only so far..

It works for me and fixes my test case.

Nitpick: "Try-acquire now that we got woken at the head of the queue."
would be more accurate by also adding "or received a signal."

--Imre