linux-kernel - Re: [PATCH RFC tip/core/rcu 12/15] lib/assoc_array: Remove smp_read_barrier

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Message-ID: <20171011171137.bb2evetsnk2qtdhc@hirez.programming.kicks-ass.net>
Date:   Wed, 11 Oct 2017 19:11:37 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:     David Howells <dhowells@...hat.com>,
        Will Deacon <will.deacon@....com>,
        linux-kernel@...r.kernel.org, mingo@...nel.org,
        torvalds@...ux-foundation.org, mark.rutland@....com,
        linux-arch@...r.kernel.org, Jonathan Corbet <corbet@....net>,
        Alexander Kuleshov <kuleshovmail@...il.com>, dvyukov@...gle.com
Subject: Re: [PATCH RFC tip/core/rcu 12/15] lib/assoc_array: Remove
 smp_read_barrier_depends()

On Wed, Oct 11, 2017 at 10:06:31AM -0700, Paul E. McKenney wrote:

> This, you mean?
> 
> data = rcu_dereference_sched(*this_cpu_ptr(&cpufreq_update_util_data));

Yep, that one. Although in my tree it now appears to look like:

        data = rcu_dereference_sched(*per_cpu_ptr(&cpufreq_update_util_data,
                                                  cpu_of(rq)));