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

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Message-ID: <20200720090050.GK10769@hirez.programming.kicks-ass.net>
Date:   Mon, 20 Jul 2020 11:00:50 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Dave Chinner <david@...morbit.com>
Cc:     Eric Biggers <ebiggers@...nel.org>,
        Matthew Wilcox <willy@...radead.org>,
        linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
        "Paul E . McKenney" <paulmck@...nel.org>,
        linux-fsdevel@...r.kernel.org, Akira Yokosawa <akiyks@...il.com>,
        Alan Stern <stern@...land.harvard.edu>,
        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 12:07:31PM +1000, Dave Chinner wrote:
> The whole serialisation/atomic/ordering APIs have fallen badly off
> the macro cliff, to the point where finding out something as simple
> as the order of parameters passed to cmpxchg and what semantics it
> provides requires macro-spelunking 5 layers deep to find the generic
> implementation function that contains a comment describing what it
> does....
> 
> That's yet another barrier to understanding what all the different
> synchronisation primitives do.

Documentation/atomic_t.txt ?