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Date:   Tue, 12 May 2020 07:19:44 -0700
From:   "Paul E. McKenney" <paulmck@kernel.org>
To:     Joel Fernandes <joel@joelfernandes.org>
Cc:     Akira Yokosawa <akiyks@gmail.com>,
        Boqun Feng <boqun.feng@gmail.com>,
        linux-kernel@vger.kernel.org, vpillai@digitalocean.com,
        Jonathan Corbet <corbet@lwn.net>,
        Alan Stern <stern@rowland.harvard.edu>,
        Andrea Parri <parri.andrea@gmail.com>,
        Will Deacon <will@kernel.org>,
        Peter Zijlstra <peterz@infradead.org>,
        Nicholas Piggin <npiggin@gmail.com>,
        David Howells <dhowells@redhat.com>,
        Jade Alglave <j.alglave@ucl.ac.uk>,
        Luc Maranget <luc.maranget@inria.fr>,
        Daniel Lustig <dlustig@nvidia.com>, linux-doc@vger.kernel.org
Subject: Re: [PATCH 0/3] tools/memory-model, Documentation/litmus-test: Sort
 out location of litmus test and README
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On Tue, May 12, 2020 at 08:19:36AM -0400, Joel Fernandes wrote:
> On Tue, May 12, 2020 at 08:50:45PM +0900, Akira Yokosawa wrote:
> [...]
> > > I think on top of this patch, I'd like to add a reference to the to the
> > > litmus test in tools/memory-model/ from Documentation/rcu/.
> > 
> > Sounds reasonable to me. But for most people, it never changes its location.
> > Please find inline comments below.
> > 
> > > 
> > > Just to mention my rationale for Documentation/litmus-tests/rcu/, I was
> > > basically looking for a central place for RCU related litmus tests in the
> > > kernel sources and the idea of this new directory came up.
> > > 
> > > For Akira's series,
> > > Acked-by: Joel Fernandes (Google) <joel@joelfernandes.org>
> > 
> > Thank you!
> > 
> > > 
> > > And could we add the following patch on top of Akira's series so we still
> > > maintain a reference to the moved RCU test?> 
> > > ---8<-----------------------
> > > 
> > > From 52fdb57551cc769d8bd690f4f2b22de36ddece99 Mon Sep 17 00:00:00 2001
> > > From: "Joel Fernandes (Google)" <joel@joelfernandes.org>
> > > Date: Mon, 11 May 2020 22:06:46 -0400
> > > Subject: [PATCH] docs: litmus-tests: Clarify about the RCU pre-initialization
> > >  test
> > > 
> > > Since this test was moved to tools/memory-model/, make sure that it is
> > > at least referenced from Documentation/litmus-tests/'s README.
> > > 
> > > Signed-off-by: Joel Fernandes (Google) <joel@joelfernandes.org>
> > > ---
> > >  Documentation/litmus-tests/README | 6 ++++--
> > >  1 file changed, 4 insertions(+), 2 deletions(-)
> > > 
> > > diff --git a/Documentation/litmus-tests/README b/Documentation/litmus-tests/README
> > > index ac0b270b456c1..53f09e74734a4 100644
> > > --- a/Documentation/litmus-tests/README
> > > +++ b/Documentation/litmus-tests/README
> > > @@ -11,7 +11,6 @@ tools/memory-model/README.
> > >  
> > >  atomic (/atomic derectory)
> > >  --------------------------
> > > -
> > >  Atomic-RMW+mb__after_atomic-is-stronger-than-acquire.litmus
> > >      Test that an atomic RMW followed by a smp_mb__after_atomic() is
> > >      stronger than a normal acquire: both the read and write parts of
> > > @@ -23,8 +22,11 @@ Atomic-RMW-ops-are-atomic-WRT-atomic_set.litmus
> > >  
> > >  RCU (/rcu directory)
> > >  --------------------
> > > -
> > 
> > I loosely followed the convention of ReST documents in putting these empty
> > lines.  But I don't mind if they are removed.
> > 
> > >  RCU+sync+read.litmus
> > >  RCU+sync+free.litmus
> > >      Both the above litmus tests demonstrate the RCU grace period guarantee
> > >      that an RCU read-side critical section can never span a grace period.
> > > +
> > > +MP+onceassign+derefonce.litmus (moved to tools/memory-model/litmus-tests/)
> > 
> > As I said above, for those who don't follow developments in the lkmm branch, 
> > MP+onceassign+derefonce.litmus stays in tools/memory-model/litmus-tests/.
> > So,
> > 
> > +MP+onceassign+derefonce.litmus (under tools/memory-model/litmus-tests/)
> > 
> > looks better to me.
> 
> Yes it stays under tools/.. but is referenced here. Sounds like you agree and
> the only change from my follow-up patch that you want is to change "moved to"
> to "under".
> 
> If so, Paul do you mind applying my patch and fixing this up? Or do you want
> to apply Akira's 3-patch series first and then have me send you another one
> on top?

Let's get something that you, Akira, and Alan are good with, then I will
apply that, either on top of or in place of the current commits (just
tell me which).

							Thanx, Paul