linux-kernel - Re: [PATCH v3 3/5] Documentation/locking/atomic: Introduce atomic-tests directory

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Date:   Thu, 27 Feb 2020 11:36:06 -0500 (EST)
From:   Alan Stern <stern@...land.harvard.edu>
To:     Boqun Feng <boqun.feng@...il.com>
cc:     linux-kernel@...r.kernel.org,
        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>,
        "Paul E. McKenney" <paulmck@...nel.org>,
        Akira Yokosawa <akiyks@...il.com>,
        Daniel Lustig <dlustig@...dia.com>,
        Jonathan Corbet <corbet@....net>,
        Mauro Carvalho Chehab <mchehab+samsung@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Rob Herring <robh@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        <linux-arch@...r.kernel.org>, <linux-doc@...r.kernel.org>
Subject: Re: [PATCH v3 3/5] Documentation/locking/atomic: Introduce atomic-tests
 directory

On Thu, 27 Feb 2020, Boqun Feng wrote:

> Although we have atomic_t.txt and its friends to describe the semantics
> of atomic APIs and lib/atomic64_test.c for build testing and testing in
> UP mode, the tests for our atomic APIs in real SMP mode are still
> missing. Since now we have the LKMM tool in kernel and litmus tests can
> be used to generate kernel modules for testing purpose with "klitmus" (a
> tool from the LKMM toolset), it makes sense to put a few typical litmus
> tests into kernel so that
> 
> 1)	they are the examples to describe the conceptual mode of the
> 	semantics of atomic APIs, and
> 
> 2)	they can be used to generate kernel test modules for anyone
> 	who is interested to test the atomic APIs implementation (in
> 	most cases, is the one who implements the APIs for a new arch)
> 
> Therefore, introduce the atomic-tests directory for this purpose. The
> directory is maintained by the LKMM group to make sure the litmus tests
> are always aligned with our memory model.
> 
> Signed-off-by: Boqun Feng <boqun.feng@...il.com>

Acked-by: Alan Stern <stern@...land.harvard.edu>

> ---
>  Documentation/atomic-tests/README | 4 ++++
>  MAINTAINERS                       | 1 +
>  2 files changed, 5 insertions(+)
>  create mode 100644 Documentation/atomic-tests/README
> 
> diff --git a/Documentation/atomic-tests/README b/Documentation/atomic-tests/README
> new file mode 100644
> index 000000000000..ae61201a4271
> --- /dev/null
> +++ b/Documentation/atomic-tests/README
> @@ -0,0 +1,4 @@
> +This directory contains litmus tests that are typical to describe the semantics
> +of our atomic APIs. For more information about how to "run" a litmus test or
> +how to generate a kernel test module based on a litmus test, please see
> +tools/memory-model/README.
> diff --git a/MAINTAINERS b/MAINTAINERS
> index ffc7d5712735..ebca5f6263bb 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -9718,6 +9718,7 @@ T:	git git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git dev
>  F:	tools/memory-model/
>  F:	Documentation/atomic_bitops.txt
>  F:	Documentation/atomic_t.txt
> +F:	Documentation/atomic-tests/
>  F:	Documentation/core-api/atomic_ops.rst
>  F:	Documentation/core-api/refcount-vs-atomic.rst
>  F:	Documentation/memory-barriers.txt
>