linux-kernel - Re: [PATCH 2/3] LKMM: Add litmus test for RCU GP guarantee where reader stores

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Message-ID: <Pine.LNX.4.44L0.2003201101060.27303-100000@netrider.rowland.org>
Date:   Fri, 20 Mar 2020 11:03:30 -0400 (EDT)
From:   Alan Stern <stern@...land.harvard.edu>
To:     "Joel Fernandes (Google)" <joel@...lfernandes.org>
cc:     linux-kernel@...r.kernel.org, Akira Yokosawa <akiyks@...il.com>,
        Andrea Parri <parri.andrea@...il.com>,
        Boqun Feng <boqun.feng@...il.com>,
        Daniel Lustig <dlustig@...dia.com>,
        David Howells <dhowells@...hat.com>,
        Jade Alglave <j.alglave@....ac.uk>,
        <linux-arch@...r.kernel.org>, Luc Maranget <luc.maranget@...ia.fr>,
        Nicholas Piggin <npiggin@...il.com>,
        "Paul E. McKenney" <paulmck@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Will Deacon <will@...nel.org>
Subject: Re: [PATCH 2/3] LKMM: Add litmus test for RCU GP guarantee where
 reader stores

On Fri, 20 Mar 2020, Joel Fernandes (Google) wrote:

> This adds an example for the important RCU grace period guarantee, which
> shows an RCU reader can never span a grace period.
> 
> Signed-off-by: Joel Fernandes (Google) <joel@...lfernandes.org>
> ---
>  .../litmus-tests/RCU+sync+read.litmus         | 37 +++++++++++++++++++
>  1 file changed, 37 insertions(+)
>  create mode 100644 tools/memory-model/litmus-tests/RCU+sync+read.litmus
> 
> diff --git a/tools/memory-model/litmus-tests/RCU+sync+read.litmus b/tools/memory-model/litmus-tests/RCU+sync+read.litmus
> new file mode 100644
> index 0000000000000..73557772e2a32
> --- /dev/null
> +++ b/tools/memory-model/litmus-tests/RCU+sync+read.litmus

Do these new tests really belong here?  I thought we were adding a new 
directory under Documentation/ for litmus tests that illustrate parts 
of the LKMM or memory-barriers.txt.

By contrast, the tests under tools/memory-model are merely to show 
people what litmus tests look like and how they should be written.

Alan