linux-kernel - Re: [PATCH v5 4/4] uio_dmem_genirq: UIO_MEM_DMA

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Message-ID: <20240204101903.GA916983@kernel.org>
Date: Sun, 4 Feb 2024 10:19:03 +0000
From: Simon Horman <horms@...nel.org>
To: Chris Leech <cleech@...hat.com>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Nilesh Javali <njavali@...vell.com>, Christoph Hellwig <hch@....de>,
	John Meneghini <jmeneghi@...hat.com>, Lee Duncan <lduncan@...e.com>,
	Mike Christie <michael.christie@...cle.com>,
	Hannes Reinecke <hare@...nel.org>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org,
	GR-QLogic-Storage-Upstream@...vell.com
Subject: Re: [PATCH v5 4/4] uio_dmem_genirq: UIO_MEM_DMA_COHERENT conversion

On Thu, Feb 01, 2024 at 03:34:00PM -0800, Chris Leech wrote:
> Conversion of this driver to use UIO_MEM_DMA_COHERENT for
> dma_alloc_coherent memory instead of UIO_MEM_PHYS.
> 
> Signed-off-by: Chris Leech <cleech@...hat.com>
> ---
>  drivers/uio/uio_dmem_genirq.c | 22 ++++++++--------------
>  1 file changed, 8 insertions(+), 14 deletions(-)
> 
> diff --git a/drivers/uio/uio_dmem_genirq.c b/drivers/uio/uio_dmem_genirq.c

..

> @@ -264,7 +257,8 @@ static int uio_dmem_genirq_probe(struct platform_device *pdev)
>  					" dynamic and fixed memory regions.\n");
>  			break;
>  		}
> -		uiomem->memtype = UIO_MEM_PHYS;
> +		uiomem->memtype = UIO_MEM_DMA_COHERENT;
> +		uiomem->dma_device = &pdev->dev,

Hi Chris,

a nit from my side.

Probably the ',' would be better written as a ';' here.
I don't think this is a bug, but using comma like this is
somewhat unexpected and confusing.

Flagged by clang-17 with -Wcomma


>  		uiomem->addr = DMEM_MAP_ERROR;
>  		uiomem->size = pdata->dynamic_region_sizes[i];
>  		++uiomem;
> -- 
> 2.43.0
> 
>