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Date: Tue, 19 Jun 2018 16:16:42 +0200 From: Peter Zijlstra <peterz@...radead.org> To: Quentin Perret <quentin.perret@....com> Cc: rjw@...ysocki.net, gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org, mingo@...hat.com, dietmar.eggemann@....com, morten.rasmussen@....com, chris.redpath@....com, patrick.bellasi@....com, valentin.schneider@....com, vincent.guittot@...aro.org, thara.gopinath@...aro.org, viresh.kumar@...aro.org, tkjos@...gle.com, joelaf@...gle.com, smuckle@...gle.com, adharmap@...cinc.com, skannan@...cinc.com, pkondeti@...eaurora.org, juri.lelli@...hat.com, edubezval@...il.com, srinivas.pandruvada@...ux.intel.com, currojerez@...eup.net, javi.merino@...nel.org Subject: Re: [RFC PATCH v3 03/10] PM: Introduce an Energy Model management framework On Tue, Jun 19, 2018 at 02:38:45PM +0100, Quentin Perret wrote: > But maybe I could use something simpler than a lock in this case ? > Would WRITE_ONCE/READ_ONCE be enough to ensure that atomicity for > example ? Yes, since its a single pointer, smp_store_release() + READ_ONCE() should be sufficient (these are the foundations of RCU).
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