From: paulmck@kernel.org
To: linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org,
kernel-team@fb.com, mingo@kernel.org
Cc: stern@rowland.harvard.edu, parri.andrea@gmail.com,
will@kernel.org, peterz@infradead.org, boqun.feng@gmail.com,
npiggin@gmail.com, dhowells@redhat.com, j.alglave@ucl.ac.uk,
luc.maranget@inria.fr, akiyks@gmail.com,
"Paul E . McKenney" <paulmck@kernel.org>
Subject: [PATCH tip/core/rcu 13/14] tools/memory-model/README: Expand dependency of klitmus7
Date: Mon, 22 Jun 2020 17:52:30 -0700 [thread overview]
Message-ID: <20200623005231.27712-13-paulmck@kernel.org> (raw)
In-Reply-To: <20200623005152.GA27459@paulmck-ThinkPad-P72>
From: Akira Yokosawa <akiyks@gmail.com>
klitmus7 is independent of the memory model but depends on the
build-target kernel release.
It occasionally lost compatibility due to kernel API changes [1, 2, 3].
It was remedied in a backwards-compatible manner respectively [4, 5, 6].
Reflect this fact in README.
[1]: b899a850431e ("compiler.h: Remove ACCESS_ONCE()")
[2]: 0bb95f80a38f ("Makefile: Globally enable VLA warning")
[3]: d56c0d45f0e2 ("proc: decouple proc from VFS with "struct proc_ops"")
[4]: https://github.com/herd/herdtools7/commit/e87d7f9287d1
("klitmus: Use WRITE_ONCE and READ_ONCE in place of deprecated ACCESS_ONCE")
[5]: https://github.com/herd/herdtools7/commit/a0cbb10d02be
("klitmus: Avoid variable length array")
[6]: https://github.com/herd/herdtools7/commit/46b9412d3a58
("klitmus: Linux kernel v5.6.x compat")
NOTE: [5] was ahead of herdtools7 7.53, which did not make an
official release. Code generated by klitmus7 without [5] can still be
built targeting Linux 4.20--5.5 if you don't care VLA warnings.
Acked-by: Andrea Parri <parri.andrea@gmail.com>
Signed-off-by: Akira Yokosawa <akiyks@gmail.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
---
tools/memory-model/README | 30 ++++++++++++++++++++++++++++--
1 file changed, 28 insertions(+), 2 deletions(-)
diff --git a/tools/memory-model/README b/tools/memory-model/README
index b9c562e..90af203 100644
--- a/tools/memory-model/README
+++ b/tools/memory-model/README
@@ -28,8 +28,34 @@ downloaded separately:
See "herdtools7/INSTALL.md" for installation instructions.
Note that although these tools usually provide backwards compatibility,
-this is not absolutely guaranteed. Therefore, if a later version does
-not work, please try using the exact version called out above.
+this is not absolutely guaranteed.
+
+For example, a future version of herd7 might not work with the model
+in this release. A compatible model will likely be made available in
+a later release of Linux kernel.
+
+If you absolutely need to run the model in this particular release,
+please try using the exact version called out above.
+
+klitmus7 is independent of the model provided here. It has its own
+dependency on a target kernel release where converted code is built
+and executed. Any change in kernel APIs essential to klitmus7 will
+necessitate an upgrade of klitmus7.
+
+If you find any compatibility issues in klitmus7, please inform the
+memory model maintainers.
+
+klitmus7 Compatibility Table
+----------------------------
+
+ ============ ==========
+ target Linux herdtools7
+ ------------ ----------
+ -- 4.18 7.48 --
+ 4.15 -- 4.19 7.49 --
+ 4.20 -- 5.5 7.54 --
+ 5.6 -- HEAD
+ ============ ==========
==================
--
2.9.5
next prev parent reply other threads:[~2020-06-23 0:52 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-23 0:51 [PATCH memory-model 0/14] LKMM updates for v5.9 Paul E. McKenney
2020-06-23 0:52 ` [PATCH tip/core/rcu 01/14] tools/memory-model: Add recent references paulmck
2020-06-23 0:52 ` [PATCH tip/core/rcu 02/14] tools/memory-model: Fix "conflict" definition paulmck
2020-06-23 0:52 ` [PATCH tip/core/rcu 03/14] Documentation: LKMM: Add litmus test for RCU GP guarantee where updater frees object paulmck
2020-06-23 0:52 ` [PATCH tip/core/rcu 04/14] Documentation: LKMM: Add litmus test for RCU GP guarantee where reader stores paulmck
2020-06-23 0:52 ` [PATCH tip/core/rcu 05/14] MAINTAINERS: Update maintainers for new Documentation/litmus-tests paulmck
2020-06-23 0:52 ` [PATCH tip/core/rcu 06/14] tools/memory-model: Add an exception for limitations on _unless() family paulmck
2020-06-23 0:52 ` [PATCH tip/core/rcu 07/14] Documentation/litmus-tests: Introduce atomic directory paulmck
2020-06-23 0:52 ` [PATCH tip/core/rcu 08/14] Documentation/litmus-tests/atomic: Add a test for atomic_set() paulmck
2020-06-23 0:52 ` [PATCH tip/core/rcu 09/14] Documentation/litmus-tests/atomic: Add a test for smp_mb__after_atomic() paulmck
2020-06-23 0:52 ` [PATCH tip/core/rcu 10/14] tools/memory-model: Fix reference to litmus test in recipes.txt paulmck
2020-06-23 0:52 ` [PATCH tip/core/rcu 11/14] Documentation/litmus-tests: Merge atomic's README into top-level one paulmck
2020-06-23 0:52 ` [PATCH tip/core/rcu 12/14] Documentation/litmus-tests: Cite an RCU litmus test paulmck
2020-06-23 0:52 ` paulmck [this message]
2020-06-23 14:37 ` [PATCH tip/core/rcu 13/14] tools/memory-model/README: Expand dependency of klitmus7 Akira Yokosawa
2020-06-23 15:54 ` Paul E. McKenney
2020-06-23 22:06 ` [PATCH 1/2] tools/memory-model/README: Mention herdtools7 7.56 in compatibility table Akira Yokosawa
2020-06-23 22:09 ` [PATCH 2/2] Documentation/litmus-tests: Add note on herd7 7.56 in atomic litmus test Akira Yokosawa
2020-06-23 23:24 ` Andrea Parri
2020-06-24 4:05 ` Paul E. McKenney
2020-06-23 22:57 ` [PATCH 1/2] tools/memory-model/README: Mention herdtools7 7.56 in compatibility table Andrea Parri
2020-06-23 0:52 ` [PATCH tip/core/rcu 14/14] docs: fix references for DMA*.txt files paulmck
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