drivers/iommu/ipmmu-vmsa.c:946:34: warning: unused variable 'ipmmu_of_ids'

From: kernel test robot
Date: Sat Mar 18 2023 - 16:50:05 EST

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Hi Robin,

FYI, the error/warning still remains.

tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: 534293368afa1a953c283310b82e4dc58309d51e
commit: b87d6d7fa405e23478f1e1dff6d66b5a533a5433 iommu/ipmmu-vmsa: Clean up bus_set_iommu()
date: 6 months ago
config: s390-randconfig-r044-20230319 (https://download.01.org/0day-ci/archive/20230319/202303190415.v9Yl9Y57-lkp@xxxxxxxxx/config)
compiler: clang version 17.0.0 (https://github.com/llvm/llvm-project 67409911353323ca5edf2049ef0df54132fa1ca7)
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=b87d6d7fa405e23478f1e1dff6d66b5a533a5433
git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
git fetch --no-tags linus master
git checkout b87d6d7fa405e23478f1e1dff6d66b5a533a5433
# 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/iommu/

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@xxxxxxxxx>
| Link: https://lore.kernel.org/oe-kbuild-all/202303190415.v9Yl9Y57-lkp@xxxxxxxxx/

All warnings (new ones prefixed by >>):

In file included from drivers/iommu/ipmmu-vmsa.c:11:
In file included from include/linux/dma-mapping.h:10:
In file included from include/linux/scatterlist.h:9:
In file included from arch/s390/include/asm/io.h:75:
include/asm-generic/io.h:547:31: 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:560:61: 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/iommu/ipmmu-vmsa.c:11:
In file included from include/linux/dma-mapping.h:10:
In file included from include/linux/scatterlist.h:9:
In file included from arch/s390/include/asm/io.h:75:
include/asm-generic/io.h:573:61: 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/iommu/ipmmu-vmsa.c:11:
In file included from include/linux/dma-mapping.h:10:
In file included from include/linux/scatterlist.h:9:
In file included from arch/s390/include/asm/io.h:75:
include/asm-generic/io.h:584:33: 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:594:59: 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:604:59: 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:692:20: 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:700:20: 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:708:20: 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:717:21: 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:726:21: 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:735:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
writesl(PCI_IOBASE + addr, buffer, count);
~~~~~~~~~~ ^
>> drivers/iommu/ipmmu-vmsa.c:946:34: warning: unused variable 'ipmmu_of_ids' [-Wunused-const-variable]
static const struct of_device_id ipmmu_of_ids[] = {
^
13 warnings generated.

vim +/ipmmu_of_ids +946 drivers/iommu/ipmmu-vmsa.c

7a62ced8ebd0e1 Yoshihiro Shimoda 2021-09-07 945
33f3ac9b511612 Magnus Damm 2017-10-16 @946 static const struct of_device_id ipmmu_of_ids[] = {
33f3ac9b511612 Magnus Damm 2017-10-16 947 {
33f3ac9b511612 Magnus Damm 2017-10-16 948 .compatible = "renesas,ipmmu-vmsa",
33f3ac9b511612 Magnus Damm 2017-10-16 949 .data = &ipmmu_features_default,
60fb0083c9d43b Fabrizio Castro 2018-08-23 950 }, {
60fb0083c9d43b Fabrizio Castro 2018-08-23 951 .compatible = "renesas,ipmmu-r8a774a1",
60fb0083c9d43b Fabrizio Castro 2018-08-23 952 .data = &ipmmu_features_rcar_gen3,
757f26a3a9ec2c Biju Das 2019-09-27 953 }, {
757f26a3a9ec2c Biju Das 2019-09-27 954 .compatible = "renesas,ipmmu-r8a774b1",
757f26a3a9ec2c Biju Das 2019-09-27 955 .data = &ipmmu_features_rcar_gen3,
b6d39cd82241bf Fabrizio Castro 2018-12-13 956 }, {
b6d39cd82241bf Fabrizio Castro 2018-12-13 957 .compatible = "renesas,ipmmu-r8a774c0",
b6d39cd82241bf Fabrizio Castro 2018-12-13 958 .data = &ipmmu_features_rcar_gen3,
4b2aa7a6f9b793 Marian-Cristian Rotariu 2020-07-14 959 }, {
4b2aa7a6f9b793 Marian-Cristian Rotariu 2020-07-14 960 .compatible = "renesas,ipmmu-r8a774e1",
4b2aa7a6f9b793 Marian-Cristian Rotariu 2020-07-14 961 .data = &ipmmu_features_rcar_gen3,
58b8e8bf409236 Magnus Damm 2017-10-16 962 }, {
58b8e8bf409236 Magnus Damm 2017-10-16 963 .compatible = "renesas,ipmmu-r8a7795",
0b8ac1409641e1 Magnus Damm 2018-06-14 964 .data = &ipmmu_features_rcar_gen3,
0b8ac1409641e1 Magnus Damm 2018-06-14 965 }, {
0b8ac1409641e1 Magnus Damm 2018-06-14 966 .compatible = "renesas,ipmmu-r8a7796",
0b8ac1409641e1 Magnus Damm 2018-06-14 967 .data = &ipmmu_features_rcar_gen3,
17fe1618163980 Yoshihiro Shimoda 2020-06-11 968 }, {
17fe1618163980 Yoshihiro Shimoda 2020-06-11 969 .compatible = "renesas,ipmmu-r8a77961",
17fe1618163980 Yoshihiro Shimoda 2020-06-11 970 .data = &ipmmu_features_rcar_gen3,
98dbffd39a6513 Jacopo Mondi 2018-06-14 971 }, {
98dbffd39a6513 Jacopo Mondi 2018-06-14 972 .compatible = "renesas,ipmmu-r8a77965",
98dbffd39a6513 Jacopo Mondi 2018-06-14 973 .data = &ipmmu_features_rcar_gen3,
3701c123e1c13c Simon Horman 2018-06-14 974 }, {
3701c123e1c13c Simon Horman 2018-06-14 975 .compatible = "renesas,ipmmu-r8a77970",
3701c123e1c13c Simon Horman 2018-06-14 976 .data = &ipmmu_features_rcar_gen3,
1cdeb52e5c245b Nikita Yushchenko 2021-09-23 977 }, {
1cdeb52e5c245b Nikita Yushchenko 2021-09-23 978 .compatible = "renesas,ipmmu-r8a77980",
1cdeb52e5c245b Nikita Yushchenko 2021-09-23 979 .data = &ipmmu_features_rcar_gen3,
b0c32912150565 Hai Nguyen Pham 2018-10-17 980 }, {
b0c32912150565 Hai Nguyen Pham 2018-10-17 981 .compatible = "renesas,ipmmu-r8a77990",
b0c32912150565 Hai Nguyen Pham 2018-10-17 982 .data = &ipmmu_features_rcar_gen3,
3701c123e1c13c Simon Horman 2018-06-14 983 }, {
3701c123e1c13c Simon Horman 2018-06-14 984 .compatible = "renesas,ipmmu-r8a77995",
3701c123e1c13c Simon Horman 2018-06-14 985 .data = &ipmmu_features_rcar_gen3,
7a62ced8ebd0e1 Yoshihiro Shimoda 2021-09-07 986 }, {
7a62ced8ebd0e1 Yoshihiro Shimoda 2021-09-07 987 .compatible = "renesas,ipmmu-r8a779a0",
ae684caf465b7d Yoshihiro Shimoda 2022-02-08 988 .data = &ipmmu_features_rcar_gen4,
ae684caf465b7d Yoshihiro Shimoda 2022-02-08 989 }, {
9f7d09fe23a011 Yoshihiro Shimoda 2022-06-17 990 .compatible = "renesas,rcar-gen4-ipmmu-vmsa",
ae684caf465b7d Yoshihiro Shimoda 2022-02-08 991 .data = &ipmmu_features_rcar_gen4,
33f3ac9b511612 Magnus Damm 2017-10-16 992 }, {
33f3ac9b511612 Magnus Damm 2017-10-16 993 /* Terminator */
33f3ac9b511612 Magnus Damm 2017-10-16 994 },
33f3ac9b511612 Magnus Damm 2017-10-16 995 };
33f3ac9b511612 Magnus Damm 2017-10-16 996

:::::: The code at line 946 was first introduced by commit
:::::: 33f3ac9b511612153bae1d328b0c84c0367cd08d iommu/ipmmu-vmsa: Introduce features, break out alias

:::::: TO: Magnus Damm <damm+renesas@xxxxxxxxxxxxx>
:::::: CC: Alex Williamson <alex.williamson@xxxxxxxxxx>

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

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