Date:   Mon, 20 Mar 2023 10:06:14 -0700
From:   Davidlohr Bueso <dave@stgolabs.net>
To:     Boqun Feng <boqun.feng@gmail.com>
Cc:     rcu@vger.kernel.org, Peter Zijlstra <peterz@infradead.org>,
        Ingo Molnar <mingo@redhat.com>, Will Deacon <will@kernel.org>,
        Waiman Long <longman@redhat.com>,
        Lai Jiangshan <jiangshanlai@gmail.com>,
        "Paul E. McKenney" <paulmck@kernel.org>,
        Josh Triplett <josh@joshtriplett.org>,
        Steven Rostedt <rostedt@goodmis.org>,
        Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
        Frederic Weisbecker <frederic@kernel.org>,
        Neeraj Upadhyay <quic_neeraju@quicinc.com>,
        Joel Fernandes <joel@joelfernandes.org>,
        Shuah Khan <shuah@kernel.org>,
        David Woodhouse <dwmw2@infradead.org>,
        Paolo Bonzini <pbonzini@redhat.com>, kvm@vger.kernel.org,
        seanjc@google.com, linux-kernel@vger.kernel.org,
        linux-kselftest@vger.kernel.org
Subject: Re: [PATCH rcu 1/7] locking/lockdep: Introduce lock_sync()
Message-ID: <20230320170614.ttnqyhemnelgmzgd@offworld>
References: <20230317031339.10277-1-boqun.feng@gmail.com>
 <20230317031339.10277-2-boqun.feng@gmail.com>
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On Thu, 16 Mar 2023, Boqun Feng wrote:

>+/*
>+ * lock_sync() - A special annotation for synchronize_{s,}rcu()-like API.
>+ *
>+ * No actual critical section is created by the APIs annotated with this: these
>+ * APIs are used to wait for one or multiple critical sections (on other CPUs
>+ * or threads), and it means that calling these APIs inside these critical
>+ * sections is potential deadlock.
>+ *
>+ * This annotation acts as an acqurie+release anontation pair with hardirqoff
				^acquire