linux-kernel - [PATCH] staging: bcm2835-camera: Avoid unneeded internal declaration warning

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Message-Id: <20180928005038.1697-1-natechancellor@gmail.com>
Date:   Thu, 27 Sep 2018 17:50:39 -0700
From:   Nathan Chancellor <natechancellor@...il.com>
To:     Eric Anholt <eric@...olt.net>,
        Stefan Wahren <stefan.wahren@...e.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-rpi-kernel@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, devel@...verdev.osuosl.org,
        linux-kernel@...r.kernel.org,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Nathan Chancellor <natechancellor@...il.com>
Subject: [PATCH] staging: bcm2835-camera: Avoid unneeded internal declaration warning

Clang warns:

drivers/staging/vc04_services/bcm2835-camera/controls.c:59:18: warning:
variable 'mains_freq_qmenu' is not needed and will not be emitted
[-Wunneeded-internal-declaration]
static const s64 mains_freq_qmenu[] = {
                 ^
1 warning generated.

This is because mains_freq_qmenu is currently only used in an ARRAY_SIZE
macro, which is a compile time evaluation in this case. Avoid this by
adding mains_freq_qmenu as the imenu member of this structure, which
matches all other controls that uses the ARRAY_SIZE macro in v4l2_ctrls.
This turns out to be a no-op because V4L2_CID_MPEG_VIDEO_BITRATE_MODE is
defined as a MMAL_CONTROL_TYPE_STD_MENU, which does not pass the imenu
definition along to v4l2_ctrl_new in bm2835_mmal_init_controls.

Link: https://github.com/ClangBuiltLinux/linux/issues/122
Signed-off-by: Nathan Chancellor <natechancellor@...il.com>
---
 drivers/staging/vc04_services/bcm2835-camera/controls.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/staging/vc04_services/bcm2835-camera/controls.c b/drivers/staging/vc04_services/bcm2835-camera/controls.c
index cff7b1e07153..a2c55cb2192a 100644
--- a/drivers/staging/vc04_services/bcm2835-camera/controls.c
+++ b/drivers/staging/vc04_services/bcm2835-camera/controls.c
@@ -1106,7 +1106,7 @@ static const struct bm2835_mmal_v4l2_ctrl v4l2_ctrls[V4L2_CTRL_COUNT] = {
 	{
 		V4L2_CID_POWER_LINE_FREQUENCY, MMAL_CONTROL_TYPE_STD_MENU,
 		0, ARRAY_SIZE(mains_freq_qmenu) - 1,
-		1, 1, NULL,
+		1, 1, mains_freq_qmenu,
 		MMAL_PARAMETER_FLICKER_AVOID,
 		&ctrl_set_flicker_avoidance,
 		false
-- 
2.19.0