linux-kernel - Re: [PATCH 1/2] Documentation/memory-barriers.txt: cross-reference "tools/memory-model/"

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Message-Id: <20180203012103.GD3617@linux.vnet.ibm.com>
Date:   Fri, 2 Feb 2018 17:21:03 -0800
From:   "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:     Andrea Parri <parri.andrea@...il.com>
Cc:     corbet@....net, dhowells@...hat.com, will.deacon@....com,
        peterz@...radead.org, linux-kernel@...r.kernel.org,
        linux-doc@...r.kernel.org, stern@...land.harvard.edu,
        boqun.feng@...il.com, npiggin@...il.com, j.alglave@....ac.uk,
        luc.maranget@...ia.fr
Subject: Re: [PATCH 1/2] Documentation/memory-barriers.txt: cross-reference
 "tools/memory-model/"

On Fri, Feb 02, 2018 at 10:12:48AM +0100, Andrea Parri wrote:
> Recent efforts led to the specification of a memory consistency model
> for the Linux kernel [1], which "can (roughly speaking) be thought of
> as an automated version of memory-barriers.txt" and which is (in turn)
> "accompanied by extensive documentation on its use and its design".
> 
> Make sure that the (occasional) reader of memory-barriers.txt will be
> aware of these developments.
> 
> [1] https://marc.info/?l=linux-kernel&m=151687290114799&w=2
> 
> Signed-off-by: Andrea Parri <parri.andrea@...il.com>

I am inclined to pull in something along these lines, but would like
some feedback on the wording, especially how "official" we want to
make the memory model to be.

Thoughts?

If I don't hear otherwise in a couple of days, I will pull this as is.

							Thanx, Paul

> ---
>  Documentation/memory-barriers.txt | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/Documentation/memory-barriers.txt b/Documentation/memory-barriers.txt
> index a863009849a3b..8cc3f098f4a7d 100644
> --- a/Documentation/memory-barriers.txt
> +++ b/Documentation/memory-barriers.txt
> @@ -17,7 +17,9 @@ meant as a guide to using the various memory barriers provided by Linux, but
>  in case of any doubt (and there are many) please ask.
> 
>  To repeat, this document is not a specification of what Linux expects from
> -hardware.
> +hardware.  For such a specification, in the form of a memory consistency
> +model, and for documentation about its usage and its design, the reader is
> +referred to "tools/memory-model/".
> 
>  The purpose of this document is twofold:
> 
> -- 
> 2.7.4
>