drivers/net/dsa/microchip/ksz9477_i2c.c:89:34: warning: unused variable 'ksz9477_dt_ids'

kernel test robot
2023-01-19T16:34:38Z

head: 7287904c8771b77b9504f53623bb477065c19a58
commit: 07bca160469b4d19ca0a35bc83b26ed18fcbd96d net: dsa: microchip: common menuconfig for ksz series switch
date: 7 months ago
config: s390-buildonly-randconfig-r001-20230119 (https://download.01.org/0day-ci/archive/20230120/202301200026.knQAJz4B-lkp@intel.com/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=07bca160469b4d19ca0a35bc83b26ed18fcbd96d
git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
git fetch --no-tags linus master
git checkout 07bca160469b4d19ca0a35bc83b26ed18fcbd96d
# 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/net/dsa/microchip/

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

All warnings (new ones prefixed by >>):

In file included from drivers/net/dsa/microchip/ksz9477_i2c.c:11:
In file included from include/linux/regmap.h:20:
In file included from include/linux/iopoll.h:14:
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/net/dsa/microchip/ksz9477_i2c.c:11:
In file included from include/linux/regmap.h:20:
In file included from include/linux/iopoll.h:14:
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/net/dsa/microchip/ksz9477_i2c.c:11:
In file included from include/linux/regmap.h:20:
In file included from include/linux/iopoll.h:14:
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/net/dsa/microchip/ksz9477_i2c.c:89:34: warning: unused variable 'ksz9477_dt_ids' [-Wunused-const-variable]
static const struct of_device_id ksz9477_dt_ids[] = {
^
13 warnings generated.

vim +/ksz9477_dt_ids +89 drivers/net/dsa/microchip/ksz9477_i2c.c

20e03777d70923 Tristram Ha 2019-09-10 88
20e03777d70923 Tristram Ha 2019-09-10 @89 static const struct of_device_id ksz9477_dt_ids[] = {
eee16b147121ce Arun Ramadoss 2022-05-17 90 {
eee16b147121ce Arun Ramadoss 2022-05-17 91 .compatible = "microchip,ksz9477",
eee16b147121ce Arun Ramadoss 2022-05-17 92 .data = &ksz_switch_chips[KSZ9477]
eee16b147121ce Arun Ramadoss 2022-05-17 93 },
eee16b147121ce Arun Ramadoss 2022-05-17 94 {
eee16b147121ce Arun Ramadoss 2022-05-17 95 .compatible = "microchip,ksz9897",
eee16b147121ce Arun Ramadoss 2022-05-17 96 .data = &ksz_switch_chips[KSZ9897]
eee16b147121ce Arun Ramadoss 2022-05-17 97 },
eee16b147121ce Arun Ramadoss 2022-05-17 98 {
eee16b147121ce Arun Ramadoss 2022-05-17 99 .compatible = "microchip,ksz9893",
eee16b147121ce Arun Ramadoss 2022-05-17 100 .data = &ksz_switch_chips[KSZ9893]
eee16b147121ce Arun Ramadoss 2022-05-17 101 },
eee16b147121ce Arun Ramadoss 2022-05-17 102 {
eee16b147121ce Arun Ramadoss 2022-05-17 103 .compatible = "microchip,ksz9563",
eee16b147121ce Arun Ramadoss 2022-05-17 104 .data = &ksz_switch_chips[KSZ9893]
eee16b147121ce Arun Ramadoss 2022-05-17 105 },
eee16b147121ce Arun Ramadoss 2022-05-17 106 {
eee16b147121ce Arun Ramadoss 2022-05-17 107 .compatible = "microchip,ksz8563",
eee16b147121ce Arun Ramadoss 2022-05-17 108 .data = &ksz_switch_chips[KSZ9893]
eee16b147121ce Arun Ramadoss 2022-05-17 109 },
eee16b147121ce Arun Ramadoss 2022-05-17 110 {
eee16b147121ce Arun Ramadoss 2022-05-17 111 .compatible = "microchip,ksz9567",
eee16b147121ce Arun Ramadoss 2022-05-17 112 .data = &ksz_switch_chips[KSZ9567]
eee16b147121ce Arun Ramadoss 2022-05-17 113 },
20e03777d70923 Tristram Ha 2019-09-10 114 {},
20e03777d70923 Tristram Ha 2019-09-10 115 };
20e03777d70923 Tristram Ha 2019-09-10 116 MODULE_DEVICE_TABLE(of, ksz9477_dt_ids);
20e03777d70923 Tristram Ha 2019-09-10 117

:::::: The code at line 89 was first introduced by commit
:::::: 20e03777d70923fe7eae0d7f043ef9488393ab95 net: dsa: microchip: add KSZ9477 I2C driver

:::::: TO: Tristram Ha <Tristram.Ha@microchip.com>
:::::: CC: David S. Miller <davem@davemloft.net>

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