From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jason Gunthorpe Subject: Re: [PATCH tip/core/rcu 16/21] drivers/infiniband: Remove now-redundant smp_read_barrier_depends() Date: Tue, 5 Dec 2017 08:08:32 -0700 Message-ID: <20171205150832.GA27409@ziepe.ca> References: <20171201195053.GA23494@linux.vnet.ibm.com> <1512157876-24665-16-git-send-email-paulmck@linux.vnet.ibm.com> <20171202001109.GQ7754@ziepe.ca> <20171202010851.GL7829@linux.vnet.ibm.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: <20171202010851.GL7829-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org> Sender: linux-rdma-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: "Paul E. McKenney" , Dennis Dalessandro Cc: linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, mingo-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org, jiangshanlai-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org, dipankar-xthvdsQ13ZrQT0dZR+AlfA@public.gmane.org, akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org, mathieu.desnoyers-vg+e7yoeK/dWk0Htik3J/w@public.gmane.org, josh-iaAMLnmF4UmaiuxdJuQwMA@public.gmane.org, tglx-hfZtesqFncYOwBW4kG4KsQ@public.gmane.org, peterz-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org, rostedt-nx8X9YLhiw1AfugRpC6u6w@public.gmane.org, dhowells-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org, edumazet-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org, fweisbec-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org, oleg-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org, Doug Ledford , Richard Henderson , Ivan Kokshaysky , Matt Turner , Michael Cree , Andrea Parri , linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-alpha-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-Id: linux-rdma@vger.kernel.org > commit c389c98ec5f4a7aa4c36853e89801eb5ea81870e > Author: Paul E. McKenney > 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@tower > > 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 > Cc: Doug Ledford > Cc: Jason Gunthorpe > Cc: Richard Henderson > Cc: Ivan Kokshaysky > Cc: Matt Turner > Cc: Michael Cree > Cc: Andrea Parri > Cc: > Cc: > [ 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 -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html