linux-kernel - Re: [RFC PATCH] tools/memory-model: Remove (dep ; rfi) from ppo

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Date:   Fri, 22 Feb 2019 12:21:28 +0100
From:   Andrea Parri <andrea.parri@...rulasolutions.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     "Paul E. McKenney" <paulmck@...ux.ibm.com>,
        linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
        Alan Stern <stern@...land.harvard.edu>,
        Will Deacon <will.deacon@....com>,
        Boqun Feng <boqun.feng@...il.com>,
        Nicholas Piggin <npiggin@...il.com>,
        David Howells <dhowells@...hat.com>,
        Jade Alglave <j.alglave@....ac.uk>,
        Luc Maranget <luc.maranget@...ia.fr>,
        Akira Yokosawa <akiyks@...il.com>,
        Daniel Lustig <dlustig@...dia.com>
Subject: Re: [RFC PATCH] tools/memory-model: Remove (dep ; rfi) from ppo

> What I do object to is a model that's weaker than any possible sane
> hardware.

Not the first time I hear you calling this out.  And inevitably, every
time, other slogans come to my mind:  "C is not an assembly language",
"No features (ordering) without users", ...

For the record, I won't try to push this patch further; I also have no
plans to touch herd7 internals in order to add the ad-hoc flag for the
(dep ; rfi) thing.  (Maybe others will/can step in here.)

In the meantime, the hope (admittedly, probably vain) is that this RFC
could serve as a further warning or as a reference to those developers
who are quivering to use (dep ; rfi): enjoy it, be careful.

  Andrea