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Date:   Sat, 18 Apr 2020 09:37:19 +0200
From:   'Greg Kroah-Hartman' <gregkh@linuxfoundation.org>
To:     Sunyoung Kang <sy0816.kang@samsung.com>
Cc:     mchehab@kernel.org, 'Hans Verkuil' <hverkuil-cisco@xs4all.nl>,
        'Arnd Bergmann' <arnd@arndb.de>,
        'Thomas Gleixner' <tglx@linutronix.de>,
        linux-media@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] media: v4l2-compat-ioctl32.c: copy reserved2 field in
 get_v4l2_buffer32
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On Sat, Apr 18, 2020 at 12:14:09PM +0900, Sunyoung Kang wrote:
> Exynos video codec driver uses reserved2 value. How will reserved2 be used
> for future use?

No driver should be using the "reserved" fields, as they are "reserved"
by the api for future expansion of it.  They are not driver-specific
fields to be used that way at all.

thanks,

greg k-h