linux-kernel - Re: [PATCH 0/3] mmc: Improve block layer requeueing behavior

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Message-ID: <bade026a-ec83-7516-d5ef-bb373df48a6e@acm.org>
Date:   Mon, 21 Nov 2022 11:14:48 -0800
From:   Bart Van Assche <bvanassche@....org>
To:     Adrian Hunter <adrian.hunter@...el.com>,
        Christian Löhle <CLoehle@...erstone.com>,
        "axboe@...nel.dk" <axboe@...nel.dk>,
        "ulf.hansson@...aro.org" <ulf.hansson@...aro.org>,
        "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-block@...r.kernel.org" <linux-block@...r.kernel.org>,
        Christoph Hellwig <hch@....de>
Cc:     Avri Altman <Avri.Altman@....com>,
        "vincent.whitchurch@...s.com" <vincent.whitchurch@...s.com>
Subject: Re: [PATCH 0/3] mmc: Improve block layer requeueing behavior

On 11/21/22 00:25, Adrian Hunter wrote:
> On 18/11/22 19:27, Bart Van Assche wrote:
>> On 11/18/22 02:47, Adrian Hunter wrote:
>>> Does anyone know why the block layer does not support
>>> (max_hw_sectors << 9) < PAGE_SIZE ?
>>
>> Does this mean that the following patch series would not only be
>> useful for UFS but also for MMC? "[PATCH 00/10] Support DMA segments
>> smaller than the page size"
>> (https://lore.kernel.org/linux-block/20221019222324.362705-1-bvanassche@acm.org/).
> 
> That patchset still does not allow max_hw_sectors = 1 which is
> what Christian's case needs.

Hi Adrian,

Why would that patch series not support max_hw_sectors = 1? What am I 
overlooking?

Thanks,

Bart.