linux-kernel - Re: [PATCHv4 10/11] videobuf2: add begin/end cpu

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Date:   Sat, 7 Mar 2020 10:32:42 +0100
From:   Hans Verkuil <hverkuil@...all.nl>
To:     Sergey Senozhatsky <senozhatsky@...omium.org>
Cc:     Hans Verkuil <hans.verkuil@...co.com>,
        Tomasz Figa <tfiga@...omium.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Kyungmin Park <kyungmin.park@...sung.com>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Sakari Ailus <sakari.ailus@....fi>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Pawel Osciak <posciak@...omium.org>,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCHv4 10/11] videobuf2: add begin/end cpu_access callbacks to
 dma-sg

On 07/03/2020 06:26, Sergey Senozhatsky wrote:
> On (20/03/06 15:04), Hans Verkuil wrote:
> [..]
>>> +	/*
>>> +	 * NOTE: dma-sg allocates memory using the page allocator directly, so
>>> +	 * there is no memory consistency guarantee, hence dma-sg ignores DMA
>>> +	 * attributes passed from the upper layer. That means that
>>> +	 * V4L2_FLAG_MEMORY_NON_CONSISTENT has no effect on dma-sg buffers.
>>> +	 */
>>>  	buf->pages = kvmalloc_array(buf->num_pages, sizeof(struct page *),
>>>  				    GFP_KERNEL | __GFP_ZERO);
>>>  	if (!buf->pages)
>>> @@ -470,6 +476,26 @@ static void vb2_dma_sg_dmabuf_ops_release(struct dma_buf *dbuf)
>>>  	vb2_dma_sg_put(dbuf->priv);
>>>  }
>>>  
>>> +static int vb2_dma_sg_dmabuf_ops_begin_cpu_access(struct dma_buf *dbuf,
>>> +					enum dma_data_direction direction)
>>
>> I suggest you use this style to avoid checkpatch warnings:
>>
>> static int
>> vb2_dma_sg_dmabuf_ops_begin_cpu_access(struct dma_buf *dbuf,
>> 				       enum dma_data_direction direction)
> 
> OK, will do.
> 
> Just for information, my checkpatch doesn't warn me:
> 
> $ ./scripts/checkpatch.pl outgoing/0010-videobuf2-add-begin-end-cpu_access-callbacks-to-dma-.patch

We use the --strict option to checkpatch.

Regards,

	Hans

> total: 0 errors, 0 warnings, 46 lines checked
> 
> outgoing/0010-videobuf2-add-begin-end-cpu_access-callbacks-to-dma-.patch has no obvious style problems and is ready for submission.
> 
> 	-ss
>