linux-kernel - Re: [RFC PATCH 0/8] mm: ioremap: Convert architectures to take GENERIC

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Date:   Mon, 17 Oct 2022 17:06:29 +0000
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     Baoquan He <bhe@...hat.com>
CC:     "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>,
        "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
        "hch@...radead.org" <hch@...radead.org>,
        "agordeev@...ux.ibm.com" <agordeev@...ux.ibm.com>,
        "wangkefeng.wang@...wei.com" <wangkefeng.wang@...wei.com>,
        "schnelle@...ux.ibm.com" <schnelle@...ux.ibm.com>,
        "David.Laight@...lab.com" <David.Laight@...lab.com>,
        "shorne@...il.com" <shorne@...il.com>
Subject: Re: [RFC PATCH 0/8] mm: ioremap: Convert architectures to take
 GENERIC_IOREMAP way (Alternative)

Hi Baoquan,

Le 17/10/2022 à 02:37, Baoquan He a écrit :
> Hi Christophe,
> 
> On 10/12/22 at 12:09pm, Christophe Leroy wrote:
>> From:
>>
>> As proposed in the discussion related to your series, here comes an
>> exemple of how it could be.
>>
>> I have taken it into ARC and IA64 architectures as an exemple. This is
>> untested, even not compiled, it is just to illustrated my meaning in the
>> discussion.
>>
>> I also added a patch for powerpc architecture, that one in tested with
>> both pmac32_defconfig and ppc64_le_defconfig.
>>
>>  From my point of view, this different approach provide less churn and
>> less intellectual disturbance than the way you do it.
> 
> Yes, I agree, and admire your insistence on the thing you think right or
> better. Learn from you.
> 
> When you suggested this in my v2 post, I made a draft patch at below link
> according to your suggestion to request people to review. What worried
> me is that I am not sure it's ignored or disliked after one week of
> waiting.
> 
> https://lore.kernel.org/all/YwtND%2FL8xD+ViN3r@MiWiFi-R3L-srv/#related
> 
> Up to now, seems people don't oppose this generic_ioremap_prot() way, we
> can take it. So what's your plan? You want me to continue with your
> patches wrapped in, or I can leave it to you if you want to take over?

I don't plan to steal your work. If you feel confortable with my 
proposal, feel free to continue with it and amplify it. You have done 
most of the job, you have a clear view of all subtilities in the 
different architectures, so please continue, I don't plan to take over 
the good work you've done until now.

The only purpose of my series was to illustrate my comments and convince 
myself it was a possible way, nothing more.

Thanks
Christophe

> 
> Thanks
> Baoquan
> 
>>
>> Baoquan He (5):
>>    hexagon: mm: Convert to GENERIC_IOREMAP
>>    openrisc: mm: remove unneeded early ioremap code
>>    mm: ioremap: allow ARCH to have its own ioremap definition
>>    arc: mm: Convert to GENERIC_IOREMAP
>>    ia64: mm: Convert to GENERIC_IOREMAP
>>
>> Christophe Leroy (3):
>>    mm/ioremap: Define generic_ioremap_prot() and generic_iounmap()
>>    mm/ioremap: Consider IOREMAP space in generic ioremap
>>    powerpc: mm: Convert to GENERIC_IOREMAP
>>
>>   arch/arc/Kconfig              |  1 +
>>   arch/arc/include/asm/io.h     |  7 +++---
>>   arch/arc/mm/ioremap.c         | 46 +++--------------------------------
>>   arch/hexagon/Kconfig          |  1 +
>>   arch/hexagon/include/asm/io.h |  9 +++++--
>>   arch/hexagon/mm/ioremap.c     | 44 ---------------------------------
>>   arch/ia64/Kconfig             |  1 +
>>   arch/ia64/include/asm/io.h    | 11 ++++++---
>>   arch/ia64/mm/ioremap.c        | 45 ++++++----------------------------
>>   arch/openrisc/mm/ioremap.c    | 22 ++++-------------
>>   arch/powerpc/Kconfig          |  1 +
>>   arch/powerpc/include/asm/io.h | 11 ++++++---
>>   arch/powerpc/mm/ioremap.c     | 26 +-------------------
>>   arch/powerpc/mm/ioremap_32.c  | 25 ++++++++-----------
>>   arch/powerpc/mm/ioremap_64.c  | 22 +++++++----------
>>   include/asm-generic/io.h      |  7 ++++++
>>   mm/ioremap.c                  | 33 +++++++++++++++++++------
>>   17 files changed, 98 insertions(+), 214 deletions(-)
>>   delete mode 100644 arch/hexagon/mm/ioremap.c
>>
>> -- 
>> 2.37.1
>>
>