linux-kernel - Re: [PATCH memory-model 3/8] tools/memory-model: Document categories of ordering primitives

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Message-ID: <20201106191147.GY3249@paulmck-ThinkPad-P72>
Date:   Fri, 6 Nov 2020 11:11:47 -0800
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     Alan Stern <stern@...land.harvard.edu>
Cc:     linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
        kernel-team@...com, mingo@...nel.org, parri.andrea@...il.com,
        will@...nel.org, peterz@...radead.org, boqun.feng@...il.com,
        npiggin@...il.com, dhowells@...hat.com, j.alglave@....ac.uk,
        luc.maranget@...ia.fr, akiyks@...il.com
Subject: Re: [PATCH memory-model 3/8] tools/memory-model: Document categories
 of ordering primitives

On Fri, Nov 06, 2020 at 11:56:54AM -0500, Alan Stern wrote:
> On Thu, Nov 05, 2020 at 02:00:12PM -0800, paulmck@...nel.org wrote:
> > From: "Paul E. McKenney" <paulmck@...nel.org>
> > 
> > The Linux kernel has a number of categories of ordering primitives, which
> > are recorded in the LKMM implementation and hinted at by cheatsheet.txt.
> > But there is no overview of these categories, and such an overview
> > is needed in order to understand multithreaded LKMM litmus tests.
> > This commit therefore adds an ordering.txt as well as extracting a
> > control-dependencies.txt from memory-barriers.txt.  It also updates the
> > README file.
> > 
> > [ paulmck:  Apply Akira Yokosawa file-placement feedback. ]
> > [ paulmck:  Apply Alan Stern feedback. ]
> > [ paulmck:  Apply self-review feedback. ]
> > Signed-off-by: Paul E. McKenney <paulmck@...nel.org>
> > ---
> > diff --git a/tools/memory-model/Documentation/README b/tools/memory-model/Documentation/README
> > index 2d9539f..a50ea81 100644
> > --- a/tools/memory-model/Documentation/README
> > +++ b/tools/memory-model/Documentation/README
> 
> > @@ -41,13 +50,21 @@ README
> >  cheatsheet.txt
> >  	Quick-reference guide to the Linux-kernel memory model.
> >  
> > +control-dependencies.txt
> > +	Guide to preventing compiler optimizations from destroying
> > +	your control dependencies.
> > +
> >  explanation.txt
> > -	Detailed description of the memory model.
> > +	Detailed description of the memory model in detail.
> 
> A redundantly redundant change.

I will revert the reversion of the removal of the added detail "in
detail".  ;-)

Good catch, thank you!

						Thanx, Paul