From mboxrd@z Thu Jan 1 00:00:00 1970 From: Boqun Feng Subject: [RFC 2/3] tools/memory-model: Add a litmus test for atomic_set() Date: Fri, 14 Feb 2020 12:01:31 +0800 Message-ID: <20200214040132.91934-3-boqun.feng@gmail.com> References: <20200214040132.91934-1-boqun.feng@gmail.com> Mime-Version: 1.0 Content-Transfer-Encoding: 8bit Return-path: In-Reply-To: <20200214040132.91934-1-boqun.feng@gmail.com> Sender: linux-kernel-owner@vger.kernel.org To: linux-kernel@vger.kernel.org Cc: Alan Stern , Andrea Parri , Will Deacon , Peter Zijlstra , Boqun Feng , Nicholas Piggin , David Howells , Jade Alglave , Luc Maranget , "Paul E. McKenney" , Akira Yokosawa , Daniel Lustig , Jonathan Corbet , linux-arch@vger.kernel.org, linux-doc@vger.kernel.org List-Id: linux-arch.vger.kernel.org We already use a litmus test in atomic_t.txt to describe the behavior of an atomic_set() with the an atomic RMW, so add it into the litmus-tests directory to make it easily accessible for anyone who cares about the semantics of our atomic APIs. Signed-off-by: Boqun Feng --- .../Atomic-set-observable-to-RMW.litmus | 24 +++++++++++++++++++ tools/memory-model/litmus-tests/README | 3 +++ 2 files changed, 27 insertions(+) create mode 100644 tools/memory-model/litmus-tests/Atomic-set-observable-to-RMW.litmus diff --git a/tools/memory-model/litmus-tests/Atomic-set-observable-to-RMW.litmus b/tools/memory-model/litmus-tests/Atomic-set-observable-to-RMW.litmus new file mode 100644 index 000000000000..4326f56f2c1a --- /dev/null +++ b/tools/memory-model/litmus-tests/Atomic-set-observable-to-RMW.litmus @@ -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); +} + +P1(atomic_t *v) +{ + atomic_set(v, 0); +} + +exists +(v=2) diff --git a/tools/memory-model/litmus-tests/README b/tools/memory-model/litmus-tests/README index 681f9067fa9e..81eeacebd160 100644 --- a/tools/memory-model/litmus-tests/README +++ b/tools/memory-model/litmus-tests/README @@ -2,6 +2,9 @@ LITMUS TESTS ============ +Atomic-set-observable-to-RMW.litmus + Test of the result of atomic_set() must be observable to atomic RMWs. + CoRR+poonceonce+Once.litmus Test of read-read coherence, that is, whether or not two successive reads from the same variable are ordered. -- 2.25.0 From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-qk1-f196.google.com ([209.85.222.196]:38123 "EHLO mail-qk1-f196.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728309AbgBNEBw (ORCPT ); Thu, 13 Feb 2020 23:01:52 -0500 From: Boqun Feng Subject: [RFC 2/3] tools/memory-model: Add a litmus test for atomic_set() Date: Fri, 14 Feb 2020 12:01:31 +0800 Message-ID: <20200214040132.91934-3-boqun.feng@gmail.com> In-Reply-To: <20200214040132.91934-1-boqun.feng@gmail.com> References: <20200214040132.91934-1-boqun.feng@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-arch-owner@vger.kernel.org List-ID: To: linux-kernel@vger.kernel.org Cc: Alan Stern , Andrea Parri , Will Deacon , Peter Zijlstra , Boqun Feng , Nicholas Piggin , David Howells , Jade Alglave , Luc Maranget , "Paul E. McKenney" , Akira Yokosawa , Daniel Lustig , Jonathan Corbet , linux-arch@vger.kernel.org, linux-doc@vger.kernel.org Message-ID: <20200214040131.9wVg-u0uY_EpkAo0ztjl8ZO_yPis3KpjLEujo-j9EIA@z> We already use a litmus test in atomic_t.txt to describe the behavior of an atomic_set() with the an atomic RMW, so add it into the litmus-tests directory to make it easily accessible for anyone who cares about the semantics of our atomic APIs. Signed-off-by: Boqun Feng --- .../Atomic-set-observable-to-RMW.litmus | 24 +++++++++++++++++++ tools/memory-model/litmus-tests/README | 3 +++ 2 files changed, 27 insertions(+) create mode 100644 tools/memory-model/litmus-tests/Atomic-set-observable-to-RMW.litmus diff --git a/tools/memory-model/litmus-tests/Atomic-set-observable-to-RMW.litmus b/tools/memory-model/litmus-tests/Atomic-set-observable-to-RMW.litmus new file mode 100644 index 000000000000..4326f56f2c1a --- /dev/null +++ b/tools/memory-model/litmus-tests/Atomic-set-observable-to-RMW.litmus @@ -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); +} + +P1(atomic_t *v) +{ + atomic_set(v, 0); +} + +exists +(v=2) diff --git a/tools/memory-model/litmus-tests/README b/tools/memory-model/litmus-tests/README index 681f9067fa9e..81eeacebd160 100644 --- a/tools/memory-model/litmus-tests/README +++ b/tools/memory-model/litmus-tests/README @@ -2,6 +2,9 @@ LITMUS TESTS ============ +Atomic-set-observable-to-RMW.litmus + Test of the result of atomic_set() must be observable to atomic RMWs. + CoRR+poonceonce+Once.litmus Test of read-read coherence, that is, whether or not two successive reads from the same variable are ordered. -- 2.25.0