linux-kernel - Re: [PATCH] tools/memory-model: document the "one-time init" pattern

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Message-ID: <20200720164850.GF119549@hirez.programming.kicks-ass.net>
Date:   Mon, 20 Jul 2020 18:48:50 +0200
From:   peterz@...radead.org
To:     "Paul E. McKenney" <paulmck@...nel.org>
Cc:     Matthew Wilcox <willy@...radead.org>,
        Alan Stern <stern@...land.harvard.edu>,
        Dave Chinner <david@...morbit.com>,
        Eric Biggers <ebiggers@...nel.org>,
        linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, Akira Yokosawa <akiyks@...il.com>,
        Andrea Parri <parri.andrea@...il.com>,
        Boqun Feng <boqun.feng@...il.com>,
        Daniel Lustig <dlustig@...dia.com>,
        "Darrick J . Wong" <darrick.wong@...cle.com>,
        David Howells <dhowells@...hat.com>,
        Jade Alglave <j.alglave@....ac.uk>,
        Luc Maranget <luc.maranget@...ia.fr>,
        Nicholas Piggin <npiggin@...il.com>,
        Will Deacon <will@...nel.org>
Subject: Re: [PATCH] tools/memory-model: document the "one-time init" pattern

On Mon, Jul 20, 2020 at 09:04:34AM -0700, Paul E. McKenney wrote:
> 2.	If we were to say "unlock" instead of "release", consistency
> 	would demand that we also say "lock" instead of "acquire".
> 	But "lock" is subtlely different than "acquire", and there is
> 	a history of people requesting further divergence.

This, acquire/release are RCpc, while (with the exception of Power)
LOCK/UNLOCK are RCsc.

( Or did we settle on RCtso for our release/acquire order? I have vague
memories of a long-ish thread, but seem to have forgotten the outcome,
if any. )

Lots of subtlety and head-aches right about there. Anyway, it would be
awesome if we can get Power into the RCsc locking camp :-)