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Message-ID: <202308011923.SJDDG6oN-lkp@intel.com>
Date:   Tue, 1 Aug 2023 19:32:34 +0800
From:   kernel test robot <lkp@...el.com>
To:     Robin Murphy <robin.murphy@....com>
Cc:     llvm@...ts.linux.dev, oe-kbuild-all@...ts.linux.dev,
        linux-kernel@...r.kernel.org, Joerg Roedel <jroedel@...e.de>
Subject: drivers/iommu/ipmmu-vmsa.c:946:34: warning: unused variable
 'ipmmu_of_ids'

Hi Robin,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   5d0c230f1de8c7515b6567d9afba1f196fb4e2f4
commit: b87d6d7fa405e23478f1e1dff6d66b5a533a5433 iommu/ipmmu-vmsa: Clean up bus_set_iommu()
date:   11 months ago
config: s390-randconfig-r015-20230731 (https://download.01.org/0day-ci/archive/20230801/202308011923.SJDDG6oN-lkp@intel.com/config)
compiler: clang version 17.0.0 (https://github.com/llvm/llvm-project.git 4a5ac14ee968ff0ad5d2cc1ffa0299048db4c88a)
reproduce: (https://download.01.org/0day-ci/archive/20230801/202308011923.SJDDG6oN-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202308011923.SJDDG6oN-lkp@intel.com/

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]
     547 |         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]
     560 |         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'
      37 | #define __le16_to_cpu(x) __swab16((__force __u16)(__le16)(x))
         |                                                           ^
   include/uapi/linux/swab.h:102:54: note: expanded from macro '__swab16'
     102 | #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]
     573 |         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'
      35 | #define __le32_to_cpu(x) __swab32((__force __u32)(__le32)(x))
         |                                                           ^
   include/uapi/linux/swab.h:115:54: note: expanded from macro '__swab32'
     115 | #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]
     584 |         __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]
     594 |         __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]
     604 |         __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]
     692 |         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]
     700 |         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]
     708 |         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]
     717 |         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]
     726 |         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]
     735 |         writesl(PCI_IOBASE + addr, buffer, count);
         |                 ~~~~~~~~~~ ^
>> drivers/iommu/ipmmu-vmsa.c:946:34: warning: unused variable 'ipmmu_of_ids' [-Wunused-const-variable]
     946 | 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@...nsource.se>
:::::: CC: Alex Williamson <alex.williamson@...hat.com>

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