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Date:   Fri, 7 Jul 2017 13:23:12 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Ingo Molnar <mingo@...nel.org>
Cc:     "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
        David Laight <David.Laight@...LAB.COM>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "netfilter-devel@...r.kernel.org" <netfilter-devel@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "oleg@...hat.com" <oleg@...hat.com>,
        "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "dave@...olabs.net" <dave@...olabs.net>,
        "manfred@...orfullife.com" <manfred@...orfullife.com>,
        "tj@...nel.org" <tj@...nel.org>, "arnd@...db.de" <arnd@...db.de>,
        "linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>,
        "will.deacon@....com" <will.deacon@....com>,
        "stern@...land.harvard.edu" <stern@...land.harvard.edu>,
        "parri.andrea@...il.com" <parri.andrea@...il.com>,
        "torvalds@...ux-foundation.org" <torvalds@...ux-foundation.org>
Subject: Re: [PATCH v2 0/9] Remove spin_unlock_wait()

On Fri, Jul 07, 2017 at 12:33:49PM +0200, Ingo Molnar wrote:

>  [1997/04] v2.1.36:
> 
>       the spin_unlock_wait() primitive gets introduced as part of release()


Whee, that goes _way_ further back than I thought it did :-)

>  [2017/07] v4.12:
> 
>       wait_task_inactive() is still alive and kicking. Its poll loop has
>       increased in complexity, but it still does not use spin_unlock_wait()
> 

I've tried 'fixing' that wait_task_inactive() thing a number of times,
but always failed :/ That is very nasty code indeed.

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