linux-kernel - Re: [PATCH v3 18/18] infiniband: cxgb4: Eliminate duplicate barriers on weakly-ordered archs

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Date:   Sun, 18 Mar 2018 19:48:05 -0600
From:   Jason Gunthorpe <jgg@...pe.ca>
To:     Sinan Kaya <okaya@...eaurora.org>
Cc:     Steve Wise <swise@...ngridcomputing.com>, netdev@...r.kernel.org,
        timur@...eaurora.org, sulrich@...eaurora.org,
        linux-arm-msm@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        'Steve Wise' <swise@...lsio.com>,
        'Doug Ledford' <dledford@...hat.com>,
        linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org,
        'Michael Werner' <werner@...lsio.com>,
        'Casey Leedom' <leedom@...lsio.com>,
        "open list:LINUX FOR POWERPC (32-BIT AND 64-BIT)" 
        <linuxppc-dev@...ts.ozlabs.org>
Subject: Re: [PATCH v3 18/18] infiniband: cxgb4: Eliminate duplicate barriers
 on weakly-ordered archs

On Sat, Mar 17, 2018 at 02:30:10PM -0400, Sinan Kaya wrote:

> Somebody also has to take a task and work very hard to get rid of __raw_writeX()
> APIs in drivers/net directory. It looked like a very common practice though
> it clearly violates multiarch portability concerns Jason and Deve highlighted.

When you posted your list I thought most of the hits were in what I'd
think of 'one-arch drivers', eg an IRQ controller or clock driver or
something.. Some might have a reason for it (eg avoiding the swap, for
instance), maybe it is a hold over from before writel_relaxed, or
maybe it is just a cargo-cult behavior..

It is the obviously multi-arch drivers that probably need some
attention..

Jason