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Date:   Thu, 6 Jun 2019 10:19:43 -0400 (EDT)
From:   Alan Stern <>
To:     Andrea Parri <>
cc:     "Paul E. McKenney" <>,
        Boqun Feng <>,
        Herbert Xu <>,
        Linus Torvalds <>,
        Frederic Weisbecker <>,
        Fengguang Wu <>, LKP <>,
        LKML <>,
        Netdev <>,
        "David S. Miller" <>,
        Luc Maranget <>,
        Jade Alglave <>
Subject: Re: rcu_read_lock lost its compiler barrier

On Thu, 6 Jun 2019, Andrea Parri wrote:

> This seems a sensible change to me: looking forward to seeing a patch,
> on top of -rcu/dev, for further review and testing!
> We could also add (to LKMM) the barrier() for rcu_read_{lock,unlock}()
> discussed in this thread (maybe once the RCU code and the informal doc
> will have settled in such direction).

Yes.  Also for SRCU.  That point had not escaped me.


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