From: Peter Zijlstra <peterz@infradead.org>
To: Marco Elver <elver@google.com>
Cc: "Paul E . McKenney" <paulmck@kernel.org>,
Alexander Potapenko <glider@google.com>,
Boqun Feng <boqun.feng@gmail.com>, Borislav Petkov <bp@alien8.de>,
Dmitry Vyukov <dvyukov@google.com>,
Ingo Molnar <mingo@kernel.org>,
Josh Poimboeuf <jpoimboe@redhat.com>,
Mark Rutland <mark.rutland@arm.com>,
Thomas Gleixner <tglx@linutronix.de>,
Waiman Long <longman@redhat.com>, Will Deacon <will@kernel.org>,
kasan-dev@googlegroups.com, linux-arch@vger.kernel.org,
linux-doc@vger.kernel.org, linux-kbuild@vger.kernel.org,
linux-kernel@vger.kernel.org, linux-mm@kvack.org, x86@kernel.org
Subject: Re: [PATCH -rcu/kcsan 16/23] locking/atomics, kcsan: Add instrumentation for barriers
Date: Tue, 5 Oct 2021 14:02:40 +0200 [thread overview]
Message-ID: <YVw+4McyFdvU7ZED@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <20211005105905.1994700-17-elver@google.com>
On Tue, Oct 05, 2021 at 12:58:58PM +0200, Marco Elver wrote:
> @@ -59,6 +60,7 @@ atomic_add(int i, atomic_t *v)
> static __always_inline int
> atomic_add_return(int i, atomic_t *v)
> {
> + kcsan_mb();
> instrument_atomic_read_write(v, sizeof(*v));
> return arch_atomic_add_return(i, v);
> }
This and others,.. is this actually correct? Should that not be
something like:
kscan_mb();
instrument_atomic_read_write(...);
ret = arch_atomic_add_return(i, v);
kcsan_mb();
return ret;
?
next prev parent reply other threads:[~2021-10-05 12:04 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-05 10:58 [PATCH -rcu/kcsan 00/23] kcsan: Support detecting a subset of missing memory barriers Marco Elver
2021-10-05 10:58 ` [PATCH -rcu/kcsan 01/23] kcsan: Refactor reading of instrumented memory Marco Elver
2021-10-05 10:58 ` [PATCH -rcu/kcsan 02/23] kcsan: Remove redundant zero-initialization of globals Marco Elver
2021-10-05 10:58 ` [PATCH -rcu/kcsan 03/23] kcsan: Avoid checking scoped accesses from nested contexts Marco Elver
2021-10-05 10:58 ` [PATCH -rcu/kcsan 04/23] kcsan: Add core support for a subset of weak memory modeling Marco Elver
2021-10-05 12:52 ` Peter Zijlstra
2021-10-05 13:13 ` Marco Elver
2021-10-05 14:20 ` Peter Zijlstra
2021-10-05 10:58 ` [PATCH -rcu/kcsan 05/23] kcsan: Add core memory barrier instrumentation functions Marco Elver
2021-10-05 11:41 ` Peter Zijlstra
2021-10-05 11:45 ` Peter Zijlstra
2021-10-05 11:50 ` Marco Elver
2021-10-05 10:58 ` [PATCH -rcu/kcsan 06/23] kcsan, kbuild: Add option for barrier instrumentation only Marco Elver
2021-10-05 10:58 ` [PATCH -rcu/kcsan 07/23] kcsan: Call scoped accesses reordered in reports Marco Elver
2021-10-05 10:58 ` [PATCH -rcu/kcsan 08/23] kcsan: Show location access was reordered to Marco Elver
2021-10-05 10:58 ` [PATCH -rcu/kcsan 09/23] kcsan: Document modeling of weak memory Marco Elver
2021-10-05 10:58 ` [PATCH -rcu/kcsan 10/23] kcsan: test: Match reordered or normal accesses Marco Elver
2021-10-05 10:58 ` [PATCH -rcu/kcsan 11/23] kcsan: test: Add test cases for memory barrier instrumentation Marco Elver
2021-10-05 10:58 ` [PATCH -rcu/kcsan 12/23] kcsan: Ignore GCC 11+ warnings about TSan runtime support Marco Elver
2021-10-05 10:58 ` [PATCH -rcu/kcsan 13/23] kcsan: selftest: Add test case to check memory barrier instrumentation Marco Elver
2021-10-05 10:58 ` [PATCH -rcu/kcsan 14/23] locking/barriers, kcsan: Add instrumentation for barriers Marco Elver
2021-10-05 10:58 ` [PATCH -rcu/kcsan 15/23] locking/barriers, kcsan: Support generic instrumentation Marco Elver
2021-10-05 10:58 ` [PATCH -rcu/kcsan 16/23] locking/atomics, kcsan: Add instrumentation for barriers Marco Elver
2021-10-05 12:02 ` Peter Zijlstra [this message]
2021-10-05 12:16 ` Marco Elver
2021-10-05 10:58 ` [PATCH -rcu/kcsan 17/23] asm-generic/bitops, " Marco Elver
2021-10-05 10:59 ` [PATCH -rcu/kcsan 18/23] x86/barriers, kcsan: Use generic instrumentation for non-smp barriers Marco Elver
2021-10-05 10:59 ` [PATCH -rcu/kcsan 19/23] x86/qspinlock, kcsan: Instrument barrier of pv_queued_spin_unlock() Marco Elver
2021-10-05 10:59 ` [PATCH -rcu/kcsan 20/23] mm, kcsan: Enable barrier instrumentation Marco Elver
2021-10-05 10:59 ` [PATCH -rcu/kcsan 21/23] sched, kcsan: Enable memory " Marco Elver
2021-10-05 10:59 ` [PATCH -rcu/kcsan 22/23] objtool, kcsan: Add memory barrier instrumentation to whitelist Marco Elver
2021-10-05 10:59 ` [PATCH -rcu/kcsan 23/23] objtool, kcsan: Remove memory barrier instrumentation from noinstr Marco Elver
2021-10-05 14:37 ` Peter Zijlstra
2021-10-05 15:13 ` Marco Elver
2021-11-11 10:11 ` Marco Elver
2021-11-11 11:35 ` Peter Zijlstra
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