From: Jason Gunthorpe Subject: Re: [PATCH tip/core/rcu 16/21] drivers/infiniband: Remove now-redundant smp_read_barrier_depends() Date: Fri, 1 Dec 2017 17:11:09 -0700 Message-ID: <20171202001109.GQ7754@ziepe.ca> References: <20171201195053.GA23494@linux.vnet.ibm.com> <1512157876-24665-16-git-send-email-paulmck@linux.vnet.ibm.com> Mime-Version: 1.0 Return-path: DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ziepe.ca; s=google; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to:user-agent; bh=BSJvrbMuKClrnF5rMcGlwAoN5wxojGzYDfr8sX4DjbI=; b=GHR7RF+QsC8SCi3CVa7/BU/U9VhQIOHZZny4mlsewocM82Xk3ggj93pfveGQAaN76+ FNZvAvV+mrmOUsrsfYRjDUlRpWPmXBjIfHxbLjharYqW7dXnEqKypwyu3PRx9M54m7iH Fzvk5/6sSDnJSpiP7YgC6xiJVtuJQYxAmwMvi+XzV3nbK7SjgIYkA28Ht+KcUveQEIlg 7aDlVvkjhaAeYtDuMucLt5Tii0u8513LhV/Fv5urshcfbFtCZVFyGbTTPy7bjm6a274R q3nukO6BxyQLwzAt/iyzKL0XX8ZFN2lZ7Wxhvdgpo/m9b2PueMNxI9EMilJJ0GxSnFzu 2w/w== Content-Disposition: inline In-Reply-To: <1512157876-24665-16-git-send-email-paulmck-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org> Sender: linux-rdma-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-ID: Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: "Paul E. McKenney" 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 On Fri, Dec 01, 2017 at 11:51:11AM -0800, Paul E. McKenney wrote: > 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 I understand DEC Alpha has PCI, and we continue to support several RDMA devices that used the PCI bus. However, the hif1, rdma vt and qib drivers modified in this patch are PCI-Express ONLY. So I think this idea is fine, but would revise the commit message to focus on PCI-E not Infiniband. > drivers/dma/ioat/dma.c | 2 -- > drivers/infiniband/Kconfig | 1 + Did you mean to have ioat/dma.c in this patch? Jason -- 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