linux-kernel - Re: [PATCH rcu 1/7] locking/lockdep: Introduce lock

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Date:   Mon, 20 Mar 2023 10:06:14 -0700
From:   Davidlohr Bueso <dave@...olabs.net>
To:     Boqun Feng <boqun.feng@...il.com>
Cc:     rcu@...r.kernel.org, Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>, Will Deacon <will@...nel.org>,
        Waiman Long <longman@...hat.com>,
        Lai Jiangshan <jiangshanlai@...il.com>,
        "Paul E. McKenney" <paulmck@...nel.org>,
        Josh Triplett <josh@...htriplett.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Frederic Weisbecker <frederic@...nel.org>,
        Neeraj Upadhyay <quic_neeraju@...cinc.com>,
        Joel Fernandes <joel@...lfernandes.org>,
        Shuah Khan <shuah@...nel.org>,
        David Woodhouse <dwmw2@...radead.org>,
        Paolo Bonzini <pbonzini@...hat.com>, kvm@...r.kernel.org,
        seanjc@...gle.com, linux-kernel@...r.kernel.org,
        linux-kselftest@...r.kernel.org
Subject: Re: [PATCH rcu 1/7] locking/lockdep: Introduce lock_sync()

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