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Date: Tue, 5 Dec 2017 12:06:14 -0800 From: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com> To: Jason Gunthorpe <jgg@...pe.ca> Cc: Dennis Dalessandro <dennis.dalessandro@...el.com>, 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, peterz@...radead.org, rostedt@...dmis.org, dhowells@...hat.com, edumazet@...gle.com, fweisbec@...il.com, oleg@...hat.com, Doug Ledford <dledford@...hat.com>, Richard Henderson <rth@...ddle.net>, Ivan Kokshaysky <ink@...assic.park.msu.ru>, Matt Turner <mattst88@...il.com>, Michael Cree <mcree@...on.net.nz>, Andrea Parri <parri.andrea@...il.com>, linux-rdma@...r.kernel.org, linux-alpha@...r.kernel.org Subject: Re: [PATCH tip/core/rcu 16/21] drivers/infiniband: Remove now-redundant smp_read_barrier_depends() On Tue, Dec 05, 2017 at 08:08:32AM -0700, Jason Gunthorpe wrote: > > commit c389c98ec5f4a7aa4c36853e89801eb5ea81870e > > Author: Paul E. McKenney <paulmck@...ux.vnet.ibm.com> > > Date: Mon Nov 27 09:04:22 2017 -0800 > > > > drivers/infiniband: Remove now-redundant smp_read_barrier_depends() > > > > The smp_read_barrier_depends() does nothing at all except on DEC Alpha, > > and no current DEC Alpha systems use Infiniband: > > > > lkml.kernel.org/r/20171023085921.jwbntptn6ictbnvj@...er > > > > This commit therefore makes Infiniband depend on !ALPHA and removes > > the now-ineffective invocations of smp_read_barrier_depends() from > > the InfiniBand driver. > > > > Please note that this patch should not be construed as my saying that > > InfiniBand's memory ordering is correct, but rather that this patch does > > not in any way affect InfiniBand's correctness. In other words, the > > result of applying this patch is bug-for-bug compatible with the original. > > > > Signed-off-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com> > > Cc: Doug Ledford <dledford@...hat.com> > > Cc: Jason Gunthorpe <jgg@...lanox.com> > > Cc: Richard Henderson <rth@...ddle.net> > > Cc: Ivan Kokshaysky <ink@...assic.park.msu.ru> > > Cc: Matt Turner <mattst88@...il.com> > > Cc: Michael Cree <mcree@...on.net.nz> > > Cc: Andrea Parri <parri.andrea@...il.com> > > Cc: <linux-rdma@...r.kernel.org> > > Cc: <linux-alpha@...r.kernel.org> > > [ paulmck: Removed drivers/dma/ioat/dma.c per Jason Gunthorpe's feedback. ] > > Let me know if you want this patch to flow through the rdma tree.. > > Acked-by: Jason Gunthorpe <jgg@...lanox.com> I applied your ack, thank you! Your choice as to what tree it flows through. By default, and if all goes well, I will push this series through -rcu and -tip during the next merge window. Thanx, Paul
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