Hi Luiz, First bad commit (maybe != root cause): tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master head: f8833a2b23562be2dae91775127c8014c44d8566 commit: 765c39a4fafe6f7ea0d370aa5f30c811579cf8eb [2075/14215] net: dsa: realtek: convert subdrivers into modules config: s390-randconfig-r005-20220323 (https://download.01.org/0day-ci/archive/20220323/202203231233.Xx73Y40o-lkp@xxxxxxxxx/config) compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 902f4708fe1d03b0de7e5315ef875006a6adc319) 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/next/linux-next.git/commit/?id=765c39a4fafe6f7ea0d370aa5f30c811579cf8eb git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git git fetch --no-tags linux-next master git checkout 765c39a4fafe6f7ea0d370aa5f30c811579cf8eb # save the config file to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=s390 SHELL=/bin/bash drivers/net/dsa/realtek/ If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@xxxxxxxxx> All warnings (new ones prefixed by >>): In file included from drivers/net/dsa/realtek/realtek-smi.c:32: In file included from include/linux/skbuff.h:31: 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: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/realtek/realtek-smi.c:32: In file included from include/linux/skbuff.h:31: 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: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/realtek/realtek-smi.c:32: In file included from include/linux/skbuff.h:31: 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: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/realtek/realtek-smi.c:496:34: warning: unused variable 'realtek_smi_of_match' [-Wunused-const-variable] static const struct of_device_id realtek_smi_of_match[] = { ^ 13 warnings generated. vim +/realtek_smi_of_match +496 drivers/net/dsa/realtek/realtek-smi.c 0650bf52b31ff35 drivers/net/dsa/realtek-smi-core.c Vladimir Oltean 2021-09-17 495 d8652956cf37c5c drivers/net/dsa/realtek-smi.c Linus Walleij 2018-07-14 @496 static const struct of_device_id realtek_smi_of_match[] = { 765c39a4fafe6f7 drivers/net/dsa/realtek/realtek-smi.c Luiz Angelo Daros de Luca 2022-01-28 497 #if IS_ENABLED(CONFIG_NET_DSA_REALTEK_RTL8366RB) d8652956cf37c5c drivers/net/dsa/realtek-smi.c Linus Walleij 2018-07-14 498 { d8652956cf37c5c drivers/net/dsa/realtek-smi.c Linus Walleij 2018-07-14 499 .compatible = "realtek,rtl8366rb", d8652956cf37c5c drivers/net/dsa/realtek-smi.c Linus Walleij 2018-07-14 500 .data = &rtl8366rb_variant, d8652956cf37c5c drivers/net/dsa/realtek-smi.c Linus Walleij 2018-07-14 501 }, 765c39a4fafe6f7 drivers/net/dsa/realtek/realtek-smi.c Luiz Angelo Daros de Luca 2022-01-28 502 #endif d8652956cf37c5c drivers/net/dsa/realtek-smi.c Linus Walleij 2018-07-14 503 { d8652956cf37c5c drivers/net/dsa/realtek-smi.c Linus Walleij 2018-07-14 504 /* FIXME: add support for RTL8366S and more */ d8652956cf37c5c drivers/net/dsa/realtek-smi.c Linus Walleij 2018-07-14 505 .compatible = "realtek,rtl8366s", d8652956cf37c5c drivers/net/dsa/realtek-smi.c Linus Walleij 2018-07-14 506 .data = NULL, d8652956cf37c5c drivers/net/dsa/realtek-smi.c Linus Walleij 2018-07-14 507 }, 765c39a4fafe6f7 drivers/net/dsa/realtek/realtek-smi.c Luiz Angelo Daros de Luca 2022-01-28 508 #if IS_ENABLED(CONFIG_NET_DSA_REALTEK_RTL8365MB) 4af2950c50c8634 drivers/net/dsa/realtek-smi-core.c Alvin Šipraga 2021-10-18 509 { 4af2950c50c8634 drivers/net/dsa/realtek-smi-core.c Alvin Šipraga 2021-10-18 510 .compatible = "realtek,rtl8365mb", 4af2950c50c8634 drivers/net/dsa/realtek-smi-core.c Alvin Šipraga 2021-10-18 511 .data = &rtl8365mb_variant, 4af2950c50c8634 drivers/net/dsa/realtek-smi-core.c Alvin Šipraga 2021-10-18 512 }, 765c39a4fafe6f7 drivers/net/dsa/realtek/realtek-smi.c Luiz Angelo Daros de Luca 2022-01-28 513 #endif d8652956cf37c5c drivers/net/dsa/realtek-smi.c Linus Walleij 2018-07-14 514 { /* sentinel */ }, d8652956cf37c5c drivers/net/dsa/realtek-smi.c Linus Walleij 2018-07-14 515 }; d8652956cf37c5c drivers/net/dsa/realtek-smi.c Linus Walleij 2018-07-14 516 MODULE_DEVICE_TABLE(of, realtek_smi_of_match); d8652956cf37c5c drivers/net/dsa/realtek-smi.c Linus Walleij 2018-07-14 517 :::::: The code at line 496 was first introduced by commit :::::: d8652956cf37c5caa8c19e0b99ce5ca235c6d5de net: dsa: realtek-smi: Add Realtek SMI driver :::::: TO: Linus Walleij <linus.walleij@xxxxxxxxxx> :::::: CC: David S. Miller <davem@xxxxxxxxxxxxx> -- 0-DAY CI Kernel Test Service https://01.org/lkp
