linux-kernel - Re: [PATCH v4 4/6] infiniband: cxgb4: Eliminate duplicate barriers on weakly-ordered archs

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Message-ID: <83484a3f-d3f7-d763-e4f8-e4fec3bb8cc2@codeaurora.org>
Date:   Thu, 22 Mar 2018 09:52:04 -0500
From:   Sinan Kaya <okaya@...eaurora.org>
To:     Steve Wise <swise@...ngridcomputing.com>,
        'kbuild test robot' <lkp@...el.com>
Cc:     kbuild-all@...org, linux-rdma@...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>,
        'Jason Gunthorpe' <jgg@...pe.ca>, linux-kernel@...r.kernel.org,
        'Casey Leedom' <leedom@...lsio.com>,
        'Michael Werner' <werner@...lsio.com>
Subject: Re: [PATCH v4 4/6] infiniband: cxgb4: Eliminate duplicate barriers on
 weakly-ordered archs

On 3/22/2018 9:40 AM, Steve Wise wrote:
> I think all these iw_cxgb4 changes should be reverted until we really have a
> plan for multi-platform that works.  

I know you are looking to have support for PowerPC. 

Isn't this a PowerPC problem? Why penalize other architectures?

Do you see anything wrong with the code itself?

I started this thread with the PowerPC develoeprs on your request.
"RFC on writel and writel_relaxed"

They are looking into adding the relaxed API support. Support can come
in later. Why block this change now?

benh@...nel.crashing.org:
"I've been wanting to implement the relaxed accessors for a while but
was battling with this to try to also better support WC, and due to
other commitments, this somewhat fell down the cracks."

I have seen four different responses on this thread. Since this is an
architecture change it will take a while to get the semantics right.
It won't happen in the new few days.

-- 
Sinan Kaya
Qualcomm Datacenter Technologies, Inc. as an affiliate of Qualcomm Technologies, Inc.
Qualcomm Technologies, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project.