linux-kernel - Re: [RFC 0/3] tools/memory-model: Add litmus tests for atomic APIs

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Message-ID: <Pine.LNX.4.44L0.2002141024141.1579-100000@iolanthe.rowland.org>
Date:   Fri, 14 Feb 2020 10:27:44 -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>, <linux-arch@...r.kernel.org>,
        <linux-doc@...r.kernel.org>
Subject: Re: [RFC 0/3] tools/memory-model: Add litmus tests for atomic APIs

On Fri, 14 Feb 2020, 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 into memory-model.

It might be worth discussing this point a little more fully.  The 
set of tests in tools/memory-model/litmus-tests/ is deliberately rather 
limited.  Paul has a vastly more expansive set of litmus tests in a 
GitHub repository, and I am doubtful about how many new tests we want 
to keep in the kernel source.

Perhaps it makes sense to have tests corresponding to all the examples
in Documentation/, perhaps not.  How do people feel about this?

Alan