netdev - Re: RFC on writel and writel

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Date:   Mon, 2 Apr 2018 09:01:37 -0400
From:   Sinan Kaya <okaya@...eaurora.org>
To:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        David Miller <davem@...emloft.net>
Cc:     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

On 3/29/2018 9:40 PM, Benjamin Herrenschmidt wrote:
> On Thu, 2018-03-29 at 09:56 -0400, Sinan Kaya wrote:
>> On 3/28/2018 11:55 AM, David Miller wrote:
>>> From: Benjamin Herrenschmidt <benh@...nel.crashing.org>
>>> Date: Thu, 29 Mar 2018 02:13:16 +1100
>>>
>>>> Let's fix all archs, it's way easier than fixing all drivers. Half of
>>>> the archs are unused or dead anyway.
>>>
>>> Agreed.
>>>
>>
>> I pinged most of the maintainers yesterday.
>> Which arches do we care about these days?
>> I have not been paying attention any other architecture besides arm64.
> 
> Thanks for going through that exercise !
> 
> Once sparc, s390, microblaze and mips reply, I think we'll have a good
> coverage, maybe riscv is to put in that lot too.


I posted the following two patches for supporting microblaze and unicore32. 

[PATCH v2 1/2] io: prevent compiler reordering on the default writeX() implementation
[PATCH v2 2/2] io: prevent compiler reordering on the default readX() implementation

The rest of the arches except mips and alpha seem OK.
I sent a question email on Friday to mips and alpha mailing lists. I'll follow up with
an actual patch today.


-- 
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.