Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org E959D6085F
Subject: Re: [PATCH v4 4/6] infiniband: cxgb4: Eliminate duplicate barriers on
 weakly-ordered archs
To:     Steve Wise <swise@opengridcomputing.com>,
        'kbuild test robot' <lkp@intel.com>
Cc:     kbuild-all@01.org, linux-rdma@vger.kernel.org,
        timur@codeaurora.org, sulrich@codeaurora.org,
        linux-arm-msm@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org,
        'Steve Wise' <swise@chelsio.com>,
        'Doug Ledford' <dledford@redhat.com>,
        'Jason Gunthorpe' <jgg@ziepe.ca>, linux-kernel@vger.kernel.org,
        'Casey Leedom' <leedom@chelsio.com>,
        'Michael Werner' <werner@chelsio.com>
References: <1521514068-8856-5-git-send-email-okaya@codeaurora.org>
 <201803221430.P43GJl9U%fengguang.wu@intel.com>
 <3664b253c730dbf83f4528acaedb3a88@codeaurora.org>
 <3e9c006e4541acbce11743dbda553e84@codeaurora.org>
 <03d201d3c1eb$b71fb460$255f1d20$@opengridcomputing.com>
From:   Sinan Kaya <okaya@codeaurora.org>
Message-ID: <83484a3f-d3f7-d763-e4f8-e4fec3bb8cc2@codeaurora.org>
Date:   Thu, 22 Mar 2018 09:52:04 -0500
User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:52.0) Gecko/20100101
 Thunderbird/52.6.0
MIME-Version: 1.0
In-Reply-To: <03d201d3c1eb$b71fb460$255f1d20$@opengridcomputing.com>
Content-Type: text/plain; charset=utf-8
Content-Language: en-US
Content-Transfer-Encoding: 7bit
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

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@kernel.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.