linux-kernel - Re: [PATCH 2/4] dma-iommu: Add iommu_dma_opt_mapping

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Message-ID: <655b915c-e8d2-d65b-676a-a51e788f1695@huawei.com>
Date:   Mon, 23 May 2022 08:01:27 +0100
From:   John Garry <john.garry@...wei.com>
To:     Damien Le Moal <damien.lemoal@...nsource.wdc.com>,
        <joro@...tes.org>, <will@...nel.org>, <jejb@...ux.ibm.com>,
        <martin.petersen@...cle.com>, <hch@....de>,
        <m.szyprowski@...sung.com>, <robin.murphy@....com>
CC:     <linux-doc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-ide@...r.kernel.org>, <iommu@...ts.linux-foundation.org>,
        <linux-scsi@...r.kernel.org>, <liyihang6@...ilicon.com>,
        <chenxiang66@...ilicon.com>, <thunder.leizhen@...wei.com>
Subject: Re: [PATCH 2/4] dma-iommu: Add iommu_dma_opt_mapping_size()

On 21/05/2022 00:33, Damien Le Moal wrote:

Hi Damien,

>> +unsigned long iova_rcache_range(void)
> Why not a size_t return type ?

The IOVA code generally uses unsigned long for size/range while 
dam-iommu uses size_t as appropiate, so I'm just sticking to that.

> 
>> +{
>> +	return PAGE_SIZE << (IOVA_RANGE_CACHE_MAX_SIZE - 1);
>> +}
>> +

Thanks,
John