linux-kernel - Re: [PATCH] [media] staging: bcm2835: mark all symbols as 'static'

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Date:   Thu, 2 Feb 2017 13:04:34 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     Mauro Carvalho Chehab <mchehab@...nel.org>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Florian Fainelli <f.fainelli@...il.com>,
        Ray Jui <rjui@...adcom.com>,
        Scott Branden <sbranden@...adcom.com>,
        bcm-kernel-feedback-list@...adcom.com,
        Stephen Warren <swarren@...dotorg.org>,
        Lee Jones <lee@...nel.org>, Eric Anholt <eric@...olt.net>,
        linux-media@...r.kernel.org, devel@...verdev.osuosl.org,
        linux-rpi-kernel@...ts.infradead.org,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] [media] staging: bcm2835: mark all symbols as 'static'

On Thu, Feb 2, 2017 at 12:34 PM, Arnd Bergmann <arnd@...db.de> wrote:
> I got a link error in allyesconfig:
>
> drivers/staging/media/platform/bcm2835/bcm2835-camera.o: In function `vidioc_enum_framesizes':
> bcm2835-camera.c:(.text.vidioc_enum_framesizes+0x0): multiple definition of `vidioc_enum_framesizes'
> drivers/media/platform/vivid/vivid-vid-cap.o:vivid-vid-cap.c:(.text.vidioc_enum_framesizes+0x0): first defined here
>
> While both drivers are equally at fault for this problem, the bcm2835 one was
> just added and is easier to fix, as it is only one file, and none of its symbols
> need to be globally visible. This marks the three global symbols as static.
>
> Fixes: 7b3ad5abf027 ("staging: Import the BCM2835 MMAL-based V4L2 camera driver.")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Please disregard this patch version, it's broken.

> @@ -50,7 +50,7 @@ MODULE_AUTHOR("Vincent Sanders");
>  MODULE_LICENSE("GPL");
>  MODULE_VERSION(BM2835_MMAL_VERSION);
>
> -int bcm2835_v4l2_debug;
> +static int bcm2835_v4l2_debug;
>  module_param_named(debug, bcm2835_v4l2_debug, int, 0644);
>  MODULE_PARM_DESC(bcm2835_v4l2_debug, "Debug level 0-2");
>

This symbol is in fact used in more than one file.

    Arnd