linux-kernel - Re: [PATCHv3 05/11] videobuf2: handle V4L2_FLAG_MEMORY_NON

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Message-ID: <7c936a58-7ad9-60a5-1f4a-e86ee358752a@xs4all.nl>
Date:   Fri, 28 Feb 2020 09:50:20 +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: [PATCHv3 05/11] videobuf2: handle V4L2_FLAG_MEMORY_NON_CONSISTENT
 flag

On 2/28/20 4:57 AM, Sergey Senozhatsky wrote:
> On (20/02/27 13:36), Hans Verkuil wrote:
> [..]
>>>  	other changes, then set ``count`` to 0, ``memory`` to
>>>  	``V4L2_MEMORY_MMAP`` and ``format.type`` to the buffer type.
>>>      * - __u32
>>> -      - ``reserved``\ [7]
>>> +      - ``flags``
>>> +      - Specifies additional buffer management attributes.
>>> +	See :ref:`memory-flags`. Old drivers and applications must set it to
>>> +	zero.
>>
>> Drop the last sentence, it's not relevant.
>>
>>> +
>>> +    * - __u32
>>> +      - ``reserved``\ [6]
>>>        - A place holder for future extensions. Drivers and applications
>>>  	must set the array to zero.
>>
>> Old drivers and applications still think reserved is [7] and will zero this.
> 
> Just to make sure, does this mean that you also want me to drop the
> "Drivers and applications must set the array to zero" sentence?

Not for the reserved field, only for the flags field.

Regards,

	Hans

> 
> 	-ss
>