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From: Andrea Parri <parri.andrea@gmail.com>
To: Boqun Feng <boqun.feng@gmail.com>
Cc: linux-kernel@vger.kernel.org,
	Alan Stern <stern@rowland.harvard.edu>,
	Will Deacon <will@kernel.org>,
	Peter Zijlstra <peterz@infradead.org>,
	Nicholas Piggin <npiggin@gmail.com>,
	David Howells <dhowells@redhat.com>,
	Jade Alglave <j.alglave@ucl.ac.uk>,
	Luc Maranget <luc.maranget@inria.fr>,
	"Paul E. McKenney" <paulmck@kernel.org>,
	Akira Yokosawa <akiyks@gmail.com>,
	Daniel Lustig <dlustig@nvidia.com>,
	Jonathan Corbet <corbet@lwn.net>,
	linux-arch@vger.kernel.org, linux-doc@vger.kernel.org
Subject: Re: [RFC 2/3] tools/memory-model: Add a litmus test for atomic_set()
Date: Fri, 14 Feb 2020 09:12:13 +0100	[thread overview]
Message-ID: <20200214081213.GA17708@andrea> (raw)
In-Reply-To: <20200214040132.91934-3-boqun.feng@gmail.com>

> @@ -0,0 +1,24 @@
> +C Atomic-set-observable-to-RMW
> +
> +(*
> + * Result: Never
> + *
> + * Test of the result of atomic_set() must be observable to atomic RMWs.
> + *)
> +
> +{
> +	atomic_t v = ATOMIC_INIT(1);
> +}
> +
> +P0(atomic_t *v)
> +{
> +	(void)atomic_add_unless(v,1,0);

We blacklisted this primitive some time ago, cf. section "LIMITATIONS",
entry (6b) in tools/memory-model/README; the discussion was here:

  https://lkml.kernel.org/r/20180829211053.20531-3-paulmck@linux.vnet.ibm.com

but unfortunately I can't remember other details at the moment: maybe
it is just a matter of or the proper time to update that section.

Thanks,
  Andrea

  reply	other threads:[~2020-02-14  8:12 UTC|newest]

Thread overview: 34+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-02-14  4:01 [RFC 0/3] tools/memory-model: Add litmus tests for atomic APIs Boqun Feng
2020-02-14  4:01 ` [RFC 1/3] Documentation/locking/atomic: Fix atomic-set litmus test Boqun Feng
2020-02-14  4:01 ` [RFC 2/3] tools/memory-model: Add a litmus test for atomic_set() Boqun Feng
2020-02-14  8:12   ` Andrea Parri [this message]
2020-02-14 10:40     ` Boqun Feng
2020-02-25  7:34       ` Boqun Feng
2020-02-25  7:34         ` Boqun Feng
2020-02-25  7:34         ` Boqun Feng
2020-02-25 13:01         ` Luc Maranget
2020-02-25 21:42           ` More on reader-writer locks Alan Stern
2020-02-26  9:46             ` Luc Maranget
2020-02-26  2:51           ` [RFC 2/3] tools/memory-model: Add a litmus test for atomic_set() Boqun Feng
2020-02-14 15:47   ` Alan Stern
2020-02-14 15:47     ` Alan Stern
2020-02-14 23:52     ` Boqun Feng
2020-02-17 11:02       ` Peter Zijlstra
2020-02-14  4:01 ` [RFC 3/3] tools/memory-model: Add litmus test for RMW + smp_mb__after_atomic() Boqun Feng
2020-02-14  6:15   ` Boqun Feng
2020-02-14  8:18     ` Andrea Parri
2020-02-14  8:20       ` Boqun Feng
2020-02-14 15:58   ` Alan Stern
2020-02-14 15:58     ` Alan Stern
2020-02-15  0:09     ` Boqun Feng
2020-02-14  9:55 ` [RFC 0/3] tools/memory-model: Add litmus tests for atomic APIs Peter Zijlstra
2020-02-14 10:20 ` Paul E. McKenney
2020-02-14 15:27 ` Alan Stern
2020-02-14 15:27   ` Alan Stern
2020-02-14 23:39   ` Boqun Feng
2020-02-15 15:25   ` Paul E. McKenney
2020-02-16  5:43     ` Boqun Feng
2020-02-16 12:06       ` Paul E. McKenney
2020-02-16 16:16         ` Alan Stern
2020-02-16 16:16           ` Alan Stern
2020-02-17  1:27           ` Boqun Feng

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