linux-kernel - Re: [PATCH] virt: Add vboxguest driver for Virtual Box Guest integration

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Date:   Wed, 4 Oct 2017 11:32:23 +0200
From:   Hans de Goede <hdegoede@...hat.com>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Michael Thayer <michael.thayer@...cle.com>,
        "Knut St . Osmundsen" <knut.osmundsen@...cle.com>,
        Larry Finger <Larry.Finger@...inger.net>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] virt: Add vboxguest driver for Virtual Box Guest
 integration

Hi,

On 03-10-17 13:41, Hans de Goede wrote:

<snip>

>>> +#define CHECK_IOCTL_IN(req)                             \
>>> +do {                                         \
>>> +    if ((req)->Hdr.cbIn != (sizeof((req)->Hdr) + sizeof((req)->u.In)) || \
>>> +        (req)->Hdr.cbOut != sizeof((req)->Hdr))                 \
>>> +        return -EINVAL;                             \
>>> +} while (0)
>>
>> Make these things functions instead of macros.
> 
> Turning these into functions is a good idea I will do so for v2.

Correction, I forgot that the passed in "req" macro
argument has a different type with all the calls, so
these cannot be changed into functions because they
rely on sizeof on the specific type to do the size
checks.

Regards,

Hans