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From: David Miller <davem@davemloft.net>
Subject: Re: RFC on writel and writel_relaxed
Date: Thu, 29 Mar 2018 10:04:14 -0400 (EDT)
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From: Sinan Kaya <okaya@codeaurora.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.