linux-kernel - Re: [PATCH tip/core/rcu 16/27] rcu: Add comment documenting how rcu_seq

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Message-ID: <20180626171454.GI2494@hirez.programming.kicks-ass.net>
Date:   Tue, 26 Jun 2018 19:14:54 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:     linux-kernel@...r.kernel.org, mingo@...nel.org,
        jiangshanlai@...il.com, dipankar@...ibm.com,
        akpm@...ux-foundation.org, mathieu.desnoyers@...icios.com,
        josh@...htriplett.org, tglx@...utronix.de, rostedt@...dmis.org,
        dhowells@...hat.com, edumazet@...gle.com, fweisbec@...il.com,
        oleg@...hat.com, joel@...lfernandes.org
Subject: Re: [PATCH tip/core/rcu 16/27] rcu: Add comment documenting how
 rcu_seq_snap works

On Mon, Jun 25, 2018 at 05:35:02PM -0700, Paul E. McKenney wrote:
> From: "Joel Fernandes (Google)" <joel@...lfernandes.org>
> 
> rcu_seq_snap may be tricky to decipher. Lets document how it works with
> an example to make it easier.

Since you had me looking at them functions; why isn't rcu_seq_snap()
using smp_load_acquire() and rcu_seq_end() using smp_store_release() ?
Their respective comments seem to suggest that would be sufficent.