linux-kernel - Re: [PATCH 4/3] docs: litmus-tests: Clarify about the RCU pre-initialization test

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Date:   Tue, 12 May 2020 11:25:05 -0400 (EDT)
From:   Alan Stern <stern@...land.harvard.edu>
To:     Akira Yokosawa <akiyks@...il.com>
cc:     "Joel Fernandes (Google)" <joel@...lfernandes.org>,
        Boqun Feng <boqun.feng@...il.com>,
        "Paul E. McKenney" <paulmck@...nel.org>,
        <linux-kernel@...r.kernel.org>, <vpillai@...italocean.com>,
        Jonathan Corbet <corbet@....net>,
        Andrea Parri <parri.andrea@...il.com>,
        Will Deacon <will@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Nicholas Piggin <npiggin@...il.com>,
        David Howells <dhowells@...hat.com>,
        Jade Alglave <j.alglave@....ac.uk>,
        Luc Maranget <luc.maranget@...ia.fr>,
        Daniel Lustig <dlustig@...dia.com>, <linux-doc@...r.kernel.org>
Subject: Re: [PATCH 4/3] docs: litmus-tests: Clarify about the RCU
 pre-initialization test

On Wed, 13 May 2020, Akira Yokosawa wrote:

> From 7bb979aacd8788d174df8a56e9803ba9e5b7a381 Mon Sep 17 00:00:00 2001
> From: Joel Fernandes (Google) <joel@...lfernandes.org>
> Date: Mon, 11 May 2020 22:06:46 -0400
> Subject: [PATCH 4/3] docs: litmus-tests: Clarify about the RCU pre-initialization test
> 
> Since this test returned to tools/memory-model/, make sure that it is
> at least referenced from Documentation/litmus-tests/'s README.
> 
> Co-developed-by: Joel Fernandes (Google) <joel@...lfernandes.org>
> Co-developed-by: Akira Yokosawa <akiyks@...il.com>
> [Alan: grammar nit]
> Suggested-by: Alan Stern <stern@...land.harvard.edu>
> Signed-off-by: Joel Fernandes (Google) <joel@...lfernandes.org>
> Signed-off-by: Akira Yokosawa <akiyks@...il.com>
> ---
> I said in the earlier message:
> 
> > The explanation under tools/memory-model/litmus-tests/README also need the same
> > rewording.
> 
> , but obviously I was confused. It is good as is.
> 
> This is on top of my earlier patch series.
> 
> Joel, Alan, does this work with you?
> 
>         Thanks, Akira
> --
>  Documentation/litmus-tests/README | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/Documentation/litmus-tests/README b/Documentation/litmus-tests/README
> index ac0b270b456c..b79e640214b9 100644
> --- a/Documentation/litmus-tests/README
> +++ b/Documentation/litmus-tests/README
> @@ -24,6 +24,10 @@ Atomic-RMW-ops-are-atomic-WRT-atomic_set.litmus
>  RCU (/rcu directory)
>  --------------------
>  
> +MP+onceassign+derefonce.litmus (under tools/memory-model/litmus-tests/)
> +    Demonstrates the use of rcu_assign_pointer() and rcu_dereference() to
> +    ensure that an RCU reader will not see pre-initialization garbage.
> +
>  RCU+sync+read.litmus
>  RCU+sync+free.litmus
>      Both the above litmus tests demonstrate the RCU grace period guarantee

That's fine with me.

Alan