linux-kernel - Re: [PATCH v3 0/5] Documentation/locking/atomic: Add litmus tests for atomic APIs

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Message-ID: <20200227154755.GJ2935@paulmck-ThinkPad-P72>
Date:   Thu, 27 Feb 2020 07:47:55 -0800
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     Boqun Feng <boqun.feng@...il.com>
Cc:     linux-kernel@...r.kernel.org,
        Alan Stern <stern@...land.harvard.edu>,
        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>,
        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 0/5] Documentation/locking/atomic: Add litmus tests
 for atomic APIs

On Thu, Feb 27, 2020 at 08:40:44AM +0800, Boqun Feng wrote:
> A recent discussion raises up the requirement for having test cases for
> atomic APIs:
> 
> 	https://lore.kernel.org/lkml/20200213085849.GL14897@hirez.programming.kicks-ass.net/
> 
> , and since we already have a way to generate a test module from a
> litmus test with klitmus[1]. It makes sense that we add more litmus
> tests for atomic APIs. And based on the previous discussion, I create a
> new directory Documentation/atomic-tests and put these litmus tests
> here.
> 
> This patchset starts the work by adding the litmus tests which are
> already used in atomic_t.txt, and also improve the atomic_t.txt to make
> it consistent with the litmus tests.
> 
> Previous version:
> v1: https://lore.kernel.org/linux-doc/20200214040132.91934-1-boqun.feng@gmail.com/
> v2: https://lore.kernel.org/lkml/20200219062627.104736-1-boqun.feng@gmail.com/
> 
> Changes since v2:
> 
> *	Change from "RFC" to "PATCH".
> 
> *	Wording improvement in atomic_t.txt as per Alan's suggestion.
> 
> *	Add a new patch describing the usage of atomic_add_unless() is
> 	not limited anymore for LKMM litmus tests.
> 
> My PR on supporting "(void) expr;" statement has been merged by Luc
> (Thank you, Luc). So all the litmus tests in this patchset can be
> handled by the herdtools compiled from latest master branch of the
> source code.
> 
> Comments and suggestions are welcome!
> 
> Regards,
> Boqun

Queued for further review, thank you, Boqun!

							Thanx, Paul

> [1]: http://diy.inria.fr/doc/litmus.html#klitmus
> 
> Boqun Feng (5):
>   tools/memory-model: Add an exception for limitations on _unless()
>     family
>   Documentation/locking/atomic: Fix atomic-set litmus test
>   Documentation/locking/atomic: Introduce atomic-tests directory
>   Documentation/locking/atomic: Add a litmus test for atomic_set()
>   Documentation/locking/atomic: Add a litmus test smp_mb__after_atomic()
> 
>  ...ter_atomic-is-stronger-than-acquire.litmus | 32 +++++++++++++++++++
>  ...c-RMW-ops-are-atomic-WRT-atomic_set.litmus | 24 ++++++++++++++
>  Documentation/atomic-tests/README             | 16 ++++++++++
>  Documentation/atomic_t.txt                    | 24 +++++++-------
>  MAINTAINERS                                   |  1 +
>  tools/memory-model/README                     | 10 ++++--
>  6 files changed, 92 insertions(+), 15 deletions(-)
>  create mode 100644 Documentation/atomic-tests/Atomic-RMW+mb__after_atomic-is-stronger-than-acquire.litmus
>  create mode 100644 Documentation/atomic-tests/Atomic-RMW-ops-are-atomic-WRT-atomic_set.litmus
>  create mode 100644 Documentation/atomic-tests/README
> 
> -- 
> 2.25.0
>