linux-kernel - Re: [PATCH v3 1/4] dma-mapping: Add dma_opt_mapping

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Message-ID: <543345ac-fbfa-1020-b6c7-72f65412f444@acm.org>
Date:   Wed, 8 Jun 2022 10:27:59 -0700
From:   Bart Van Assche <bvanassche@....org>
To:     John Garry <john.garry@...wei.com>,
        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 v3 1/4] dma-mapping: Add dma_opt_mapping_size()

On 6/6/22 02:30, John Garry wrote:
> +::
> +
> +	size_t
> +	dma_opt_mapping_size(struct device *dev);
> +
> +Returns the maximum optimal size of a mapping for the device. Mapping large
> +buffers may take longer so device drivers are advised to limit total DMA
> +streaming mappings length to the returned value.

"Maximum optimal" sounds weird to me. Is there a single optimal value or 
are there multiple optimal values? In the former case I think that the 
word "maximum" should be left out.

Thanks,

Bart.