linux-kernel - Re: [PATCH net-next v8 1/6] page_pool: frag API support for 32-bit arch with 64-bit DMA

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Message-ID: <b0388db7-d4b2-443b-12f0-fbe6ae4002cd@huawei.com>
Date:   Mon, 25 Sep 2023 19:31:39 +0800
From:   Yunsheng Lin <linyunsheng@...wei.com>
To:     Ilias Apalodimas <ilias.apalodimas@...aro.org>
CC:     Jesper Dangaard Brouer <jbrouer@...hat.com>, <davem@...emloft.net>,
        <kuba@...nel.org>, <pabeni@...hat.com>, <brouer@...hat.com>,
        <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Lorenzo Bianconi <lorenzo@...nel.org>,
        Alexander Duyck <alexander.duyck@...il.com>,
        Liang Chen <liangchen.linux@...il.com>,
        Alexander Lobakin <aleksander.lobakin@...el.com>,
        Guillaume Tucker <guillaume.tucker@...labora.com>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        Linux-MM <linux-mm@...ck.org>,
        Matthew Wilcox <willy@...radead.org>,
        Mel Gorman <mgorman@...hsingularity.net>
Subject: Re: [PATCH net-next v8 1/6] page_pool: frag API support for 32-bit
 arch with 64-bit DMA

On 2023/9/25 18:37, Ilias Apalodimas wrote:
> Hi
> 
> On Wed, 20 Sept 2023 at 11:59, Yunsheng Lin <linyunsheng@...wei.com> wrote:
>>
>> On 2023/9/15 16:28, Jesper Dangaard Brouer wrote:
>>> Hi Lin,
>>>
>>> This looks reasonable, but given you are changing struct-page
>>> (include/linux/mm_types.h) we need to MM-list <linux-mm@...ck.org>.
>>> Also Cc Wilcox.
>>>
>>> I think it was Ilias and Duyck that validated the assumptions, last time
>>> this patch was discussed. Thus I want to see their review before this is
>>> applied.
>>
>> FWIW, PAGE_SIZE aligned buffer being PAGE_SIZE aligned in DMA is
>> validated by Duyck:
>> https://lore.kernel.org/all/CAKgT0UfeUAUQpEffxnkc+gzXsjOrHkuMgxU_Aw0VXSJYKzaovQ@mail.gmail.com/
>>
>> And I had done researching to find out there seems to be no combination of
>> the above arch with an address space >16TB:
>> https://lore.kernel.org/all/2b570282-24f8-f23b-1ff7-ad836794baa9@huawei.com/
> 
> Apologies for the late reply.  I just saw you sent a v9, I'll review
> that instead, but I am traveling right now, will take a while

Actually there is a newer v10, see:
https://lore.kernel.org/all/20230922091138.18014-2-linyunsheng@huawei.com/

Thanks for the time reviewing.

> 
> Thanks
> /Ilias