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Date:   Thu, 29 Mar 2018 10:04:14 -0400 (EDT)
From:   David Miller <davem@...emloft.net>
To:     okaya@...eaurora.org
Cc:     benh@...nel.crashing.org, torvalds@...ux-foundation.org,
        alexander.duyck@...il.com, will.deacon@....com, arnd@...db.de,
        jgg@...pe.ca, David.Laight@...lab.com, oohall@...il.com,
        linuxppc-dev@...ts.ozlabs.org, linux-rdma@...r.kernel.org,
        alexander.h.duyck@...hat.com, paulmck@...ux.vnet.ibm.com,
        netdev@...r.kernel.org, linus971@...il.com
Subject: Re: RFC on writel and writel_relaxed

From: Sinan Kaya <okaya@...eaurora.org>
Date: Thu, 29 Mar 2018 09:56:01 -0400

> sparc		question sent

Sparc never lets physical memory accesses pass MMIO, and vice versa.

They are always strongly ordered amongst eachother.

Therefore no explicit barrier instructions are necessary.

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