linux-kernel - Re: [PATCH memory-model] docs: memory-barriers: Add note on compiler transformation and address deps

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Message-ID: <f8d82079-bd45-428f-ab3b-593fd3757baf@paulmck-laptop>
Date:   Sat, 21 Oct 2023 13:07:25 -0700
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     Alan Stern <stern@...land.harvard.edu>
Cc:     Jonas Oberhauser <jonas.oberhauser@...weicloud.com>,
        linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
        linux-doc@...r.kernel.org, Andrea Parri <parri.andrea@...il.com>,
        Will Deacon <will@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        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>,
        Joel Fernandes <joel@...lfernandes.org>,
        Jonathan Corbet <corbet@....net>
Subject: Re: [PATCH memory-model] docs: memory-barriers: Add note on compiler
 transformation and address deps

On Sat, Oct 21, 2023 at 12:03:30PM -0400, Alan Stern wrote:
> On Sat, Oct 21, 2023 at 08:10:27AM -0700, Paul E. McKenney wrote:
> > On Sat, Oct 21, 2023 at 03:36:21PM +0200, Jonas Oberhauser wrote:
> > > 
> > > Am 10/20/2023 um 8:13 PM schrieb Paul E. McKenney:
> > > > Fair enough in general, but I cannot promise to never confuse people.
> > > > This is after all memory ordering.  And different people will be confused
> > > > by different things.
> > > 
> > > You can say that twice. In fact I suspect this is not the first time you say
> > > that :))
> > 
> > Easy for me to say, "that that that that that that that that that that"!
> 
> This reminds me of a sentence I once heard as an example of 
> inscrutability.  Written without punctuation, it goes:
> 
> 	Jack when Joe had had had had had had had had had had
> 	the teachers approval.
> 
> Properly punctuated, it says:
> 
> 	Jack, when Joe had had "had", had had "had had"; "had had" had 
> 	the teacher's approval.
> 
> The context is supposed to be a comparison of the words two students 
> used in their essays and how their teacher reacted.  It actually 
> makes sense when read carefully.

Cute!

In contrast, any sensible interpretationof my string of "that"s is
pure coincidence.  ;-)

							Thanx, Paul