From: Boqun Feng <boqun.feng@gmail.com>
To: linux-kernel@vger.kernel.org
Cc: Alan Stern <stern@rowland.harvard.edu>,
Andrea Parri <parri.andrea@gmail.com>,
Will Deacon <will@kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
Boqun Feng <boqun.feng@gmail.com>,
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>,
Mauro Carvalho Chehab <mchehab+samsung@kernel.org>,
"David S. Miller" <davem@davemloft.net>,
Rob Herring <robh@kernel.org>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Jonathan Cameron <Jonathan.Cameron@huawei.com>,
Joel Fernandes <joel@joelfernandes.org>,
linux-arch@vger.kernel.org, linux-doc@vger.kernel.org
Subject: [PATCH v4 1/4] tools/memory-model: Add an exception for limitations on _unless() family
Date: Thu, 26 Mar 2020 10:40:19 +0800 [thread overview]
Message-ID: <20200326024022.7566-2-boqun.feng@gmail.com> (raw)
In-Reply-To: <20200326024022.7566-1-boqun.feng@gmail.com>
According to Luc, atomic_add_unless() is directly provided by herd7,
therefore it can be used in litmus tests. So change the limitation
section in README to unlimit the use of atomic_add_unless().
Cc: Luc Maranget <luc.maranget@inria.fr>
Signed-off-by: Boqun Feng <boqun.feng@gmail.com>
Acked-by: Andrea Parri <parri.andrea@gmail.com>
---
tools/memory-model/README | 10 +++++++---
1 file changed, 7 insertions(+), 3 deletions(-)
diff --git a/tools/memory-model/README b/tools/memory-model/README
index fc07b52f2028..b9c562e92981 100644
--- a/tools/memory-model/README
+++ b/tools/memory-model/README
@@ -207,11 +207,15 @@ The Linux-kernel memory model (LKMM) has the following limitations:
case as a store release.
b. The "unless" RMW operations are not currently modeled:
- atomic_long_add_unless(), atomic_add_unless(),
- atomic_inc_unless_negative(), and
- atomic_dec_unless_positive(). These can be emulated
+ atomic_long_add_unless(), atomic_inc_unless_negative(),
+ and atomic_dec_unless_positive(). These can be emulated
in litmus tests, for example, by using atomic_cmpxchg().
+ One exception of this limitation is atomic_add_unless(),
+ which is provided directly by herd7 (so no corresponding
+ definition in linux-kernel.def). atomic_add_unless() is
+ modeled by herd7 therefore it can be used in litmus tests.
+
c. The call_rcu() function is not modeled. It can be
emulated in litmus tests by adding another process that
invokes synchronize_rcu() and the body of the callback
--
2.25.1
next prev parent reply other threads:[~2020-03-26 2:40 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-26 2:40 [PATCH v4 0/4] Documentation/litmus-tests: Add litmus tests for atomic APIs Boqun Feng
2020-03-26 2:40 ` Boqun Feng [this message]
2020-03-26 2:40 ` [PATCH v4 2/4] Documentation/litmus-tests: Introduce atomic directory Boqun Feng
2020-03-26 2:40 ` [PATCH v4 3/4] Documentation/litmus-tests/atomic: Add a test for atomic_set() Boqun Feng
2020-03-26 14:23 ` Alan Stern
2020-03-26 2:40 ` [PATCH v4 4/4] Documentation/litmus-tests/atomic: Add a test for smp_mb__after_atomic() Boqun Feng
2020-03-27 22:18 ` [PATCH v4 0/4] Documentation/litmus-tests: Add litmus tests for atomic APIs Joel Fernandes
2020-03-31 1:40 ` Boqun Feng
2020-04-02 3:58 ` Joel Fernandes
2020-04-02 8:03 ` Boqun Feng
2020-04-04 19:57 ` Joel Fernandes
2020-04-01 16:34 ` Paul E. McKenney
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20200326024022.7566-2-boqun.feng@gmail.com \
--to=boqun.feng@gmail.com \
--cc=Jonathan.Cameron@huawei.com \
--cc=akiyks@gmail.com \
--cc=corbet@lwn.net \
--cc=davem@davemloft.net \
--cc=dhowells@redhat.com \
--cc=dlustig@nvidia.com \
--cc=gregkh@linuxfoundation.org \
--cc=j.alglave@ucl.ac.uk \
--cc=joel@joelfernandes.org \
--cc=linux-arch@vger.kernel.org \
--cc=linux-doc@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=luc.maranget@inria.fr \
--cc=mchehab+samsung@kernel.org \
--cc=npiggin@gmail.com \
--cc=parri.andrea@gmail.com \
--cc=paulmck@kernel.org \
--cc=peterz@infradead.org \
--cc=robh@kernel.org \
--cc=stern@rowland.harvard.edu \
--cc=will@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).