drivers/media/platform/samsung/s5p-jpeg/jpeg-core.c:3126:34: warning: unused variable 'samsung_jpeg_match'

From: kernel test robot
Date: Thu Jan 19 2023 - 23:53:31 EST

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Hi Mauro,

FYI, the error/warning still remains.

tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: 7287904c8771b77b9504f53623bb477065c19a58
commit: f4104b7851a8d8b9a70899dcbecdb393eb16cd8a media: platform: rename s5p-jpeg/ to samsung/s5p-jpeg/
date: 10 months ago
config: s390-randconfig-r022-20230119 (https://download.01.org/0day-ci/archive/20230120/202301200040.zG7IbEei-lkp@xxxxxxxxx/config)
compiler: clang version 16.0.0 (https://github.com/llvm/llvm-project 4196ca3278f78c6e19246e54ab0ecb364e37d66a)
reproduce (this is a W=1 build):
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# install s390 cross compiling tool for clang build
# apt-get install binutils-s390x-linux-gnu
# https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=f4104b7851a8d8b9a70899dcbecdb393eb16cd8a
git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
git fetch --no-tags linus master
git checkout f4104b7851a8d8b9a70899dcbecdb393eb16cd8a
# save the config file
mkdir build_dir && cp config build_dir/.config
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=s390 olddefconfig
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=s390 SHELL=/bin/bash drivers/media/platform/samsung/s5p-jpeg/

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@xxxxxxxxx>

All warnings (new ones prefixed by >>):

In file included from drivers/media/platform/samsung/s5p-jpeg/jpeg-core.c:15:
In file included from include/linux/io.h:13:
In file included from arch/s390/include/asm/io.h:75:
include/asm-generic/io.h:464:31: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
val = __raw_readb(PCI_IOBASE + addr);
~~~~~~~~~~ ^
include/asm-generic/io.h:477:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
val = __le16_to_cpu((__le16 __force)__raw_readw(PCI_IOBASE + addr));
~~~~~~~~~~ ^
include/uapi/linux/byteorder/big_endian.h:37:59: note: expanded from macro '__le16_to_cpu'
#define __le16_to_cpu(x) __swab16((__force __u16)(__le16)(x))
^
include/uapi/linux/swab.h:102:54: note: expanded from macro '__swab16'
#define __swab16(x) (__u16)__builtin_bswap16((__u16)(x))
^
In file included from drivers/media/platform/samsung/s5p-jpeg/jpeg-core.c:15:
In file included from include/linux/io.h:13:
In file included from arch/s390/include/asm/io.h:75:
include/asm-generic/io.h:490:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
val = __le32_to_cpu((__le32 __force)__raw_readl(PCI_IOBASE + addr));
~~~~~~~~~~ ^
include/uapi/linux/byteorder/big_endian.h:35:59: note: expanded from macro '__le32_to_cpu'
#define __le32_to_cpu(x) __swab32((__force __u32)(__le32)(x))
^
include/uapi/linux/swab.h:115:54: note: expanded from macro '__swab32'
#define __swab32(x) (__u32)__builtin_bswap32((__u32)(x))
^
In file included from drivers/media/platform/samsung/s5p-jpeg/jpeg-core.c:15:
In file included from include/linux/io.h:13:
In file included from arch/s390/include/asm/io.h:75:
include/asm-generic/io.h:501:33: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
__raw_writeb(value, PCI_IOBASE + addr);
~~~~~~~~~~ ^
include/asm-generic/io.h:511:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
__raw_writew((u16 __force)cpu_to_le16(value), PCI_IOBASE + addr);
~~~~~~~~~~ ^
include/asm-generic/io.h:521:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
__raw_writel((u32 __force)cpu_to_le32(value), PCI_IOBASE + addr);
~~~~~~~~~~ ^
include/asm-generic/io.h:609:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
readsb(PCI_IOBASE + addr, buffer, count);
~~~~~~~~~~ ^
include/asm-generic/io.h:617:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
readsw(PCI_IOBASE + addr, buffer, count);
~~~~~~~~~~ ^
include/asm-generic/io.h:625:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
readsl(PCI_IOBASE + addr, buffer, count);
~~~~~~~~~~ ^
include/asm-generic/io.h:634:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
writesb(PCI_IOBASE + addr, buffer, count);
~~~~~~~~~~ ^
include/asm-generic/io.h:643:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
writesw(PCI_IOBASE + addr, buffer, count);
~~~~~~~~~~ ^
include/asm-generic/io.h:652:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
writesl(PCI_IOBASE + addr, buffer, count);
~~~~~~~~~~ ^
>> drivers/media/platform/samsung/s5p-jpeg/jpeg-core.c:3126:34: warning: unused variable 'samsung_jpeg_match' [-Wunused-const-variable]
static const struct of_device_id samsung_jpeg_match[] = {
^
13 warnings generated.

vim +/samsung_jpeg_match +3126 drivers/media/platform/samsung/s5p-jpeg/jpeg-core.c

6c96dbbc2aa9f5 drivers/media/platform/s5p-jpeg/jpeg-core.c Andrzej Pietrasiewicz 2015-09-18 3125
80529ae5c13725 drivers/media/platform/s5p-jpeg/jpeg-core.c Jacek Anaszewski 2013-12-18 @3126 static const struct of_device_id samsung_jpeg_match[] = {
80529ae5c13725 drivers/media/platform/s5p-jpeg/jpeg-core.c Jacek Anaszewski 2013-12-18 3127 {
80529ae5c13725 drivers/media/platform/s5p-jpeg/jpeg-core.c Jacek Anaszewski 2013-12-18 3128 .compatible = "samsung,s5pv210-jpeg",
80529ae5c13725 drivers/media/platform/s5p-jpeg/jpeg-core.c Jacek Anaszewski 2013-12-18 3129 .data = &s5p_jpeg_drvdata,
3246fdaa0ac2d9 drivers/media/platform/s5p-jpeg/jpeg-core.c Jacek Anaszewski 2014-07-11 3130 }, {
3246fdaa0ac2d9 drivers/media/platform/s5p-jpeg/jpeg-core.c Jacek Anaszewski 2014-07-11 3131 .compatible = "samsung,exynos3250-jpeg",
3246fdaa0ac2d9 drivers/media/platform/s5p-jpeg/jpeg-core.c Jacek Anaszewski 2014-07-11 3132 .data = &exynos3250_jpeg_drvdata,
80529ae5c13725 drivers/media/platform/s5p-jpeg/jpeg-core.c Jacek Anaszewski 2013-12-18 3133 }, {
80529ae5c13725 drivers/media/platform/s5p-jpeg/jpeg-core.c Jacek Anaszewski 2013-12-18 3134 .compatible = "samsung,exynos4210-jpeg",
3246fdaa0ac2d9 drivers/media/platform/s5p-jpeg/jpeg-core.c Jacek Anaszewski 2014-07-11 3135 .data = &exynos4_jpeg_drvdata,
80529ae5c13725 drivers/media/platform/s5p-jpeg/jpeg-core.c Jacek Anaszewski 2013-12-18 3136 }, {
80529ae5c13725 drivers/media/platform/s5p-jpeg/jpeg-core.c Jacek Anaszewski 2013-12-18 3137 .compatible = "samsung,exynos4212-jpeg",
80529ae5c13725 drivers/media/platform/s5p-jpeg/jpeg-core.c Jacek Anaszewski 2013-12-18 3138 .data = &exynos4_jpeg_drvdata,
7c15fd4bf3d367 drivers/media/platform/s5p-jpeg/jpeg-core.c Andrzej Pietrasiewicz 2015-03-09 3139 }, {
7c15fd4bf3d367 drivers/media/platform/s5p-jpeg/jpeg-core.c Andrzej Pietrasiewicz 2015-03-09 3140 .compatible = "samsung,exynos5420-jpeg",
7c15fd4bf3d367 drivers/media/platform/s5p-jpeg/jpeg-core.c Andrzej Pietrasiewicz 2015-03-09 3141 .data = &exynos5420_jpeg_drvdata,
6c96dbbc2aa9f5 drivers/media/platform/s5p-jpeg/jpeg-core.c Andrzej Pietrasiewicz 2015-09-18 3142 }, {
6c96dbbc2aa9f5 drivers/media/platform/s5p-jpeg/jpeg-core.c Andrzej Pietrasiewicz 2015-09-18 3143 .compatible = "samsung,exynos5433-jpeg",
6c96dbbc2aa9f5 drivers/media/platform/s5p-jpeg/jpeg-core.c Andrzej Pietrasiewicz 2015-09-18 3144 .data = &exynos5433_jpeg_drvdata,
80529ae5c13725 drivers/media/platform/s5p-jpeg/jpeg-core.c Jacek Anaszewski 2013-12-18 3145 },
80529ae5c13725 drivers/media/platform/s5p-jpeg/jpeg-core.c Jacek Anaszewski 2013-12-18 3146 {},
80529ae5c13725 drivers/media/platform/s5p-jpeg/jpeg-core.c Jacek Anaszewski 2013-12-18 3147 };
80529ae5c13725 drivers/media/platform/s5p-jpeg/jpeg-core.c Jacek Anaszewski 2013-12-18 3148

:::::: The code at line 3126 was first introduced by commit
:::::: 80529ae5c13725e12ba0377e29b2160794ba6b25 [media] s5p-jpeg: JPEG codec

:::::: TO: Jacek Anaszewski <j.anaszewski@xxxxxxxxxxx>
:::::: CC: Mauro Carvalho Chehab <m.chehab@xxxxxxxxxxx>

--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests

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