tree: https://git.kernel.org/pub/scm/linux/kernel/git/bp/bp.git rc0+notifiers head: 29ab05dcfc8e05ffc1cae77249ea956b787939d2 commit: 29ab05dcfc8e05ffc1cae77249ea956b787939d2 [32/32] notifier: Return an error when callback is already registered config: s390-defconfig (attached as .config) compiler: s390-linux-gcc (GCC) 11.2.0 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 # https://git.kernel.org/pub/scm/linux/kernel/git/bp/bp.git/commit/?id=29ab05dcfc8e05ffc1cae77249ea956b787939d2 git remote add bp https://git.kernel.org/pub/scm/linux/kernel/git/bp/bp.git git fetch --no-tags bp rc0+notifiers git checkout 29ab05dcfc8e05ffc1cae77249ea956b787939d2 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross ARCH=s390 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot All warnings (new ones prefixed by >>): arch/s390/kernel/ipl.c: In function 'setup_ipl': >> arch/s390/kernel/ipl.c:2072:9: warning: ignoring return value of 'atomic_notifier_chain_register' declared with attribute 'warn_unused_result' [-Wunused-result] 2072 | atomic_notifier_chain_register(&panic_notifier_list, &on_panic_nb); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ -- arch/s390/kvm/kvm-s390.c: In function 'kvm_arch_hardware_setup': >> arch/s390/kvm/kvm-s390.c:328:9: warning: ignoring return value of 'atomic_notifier_chain_register' declared with attribute 'warn_unused_result' [-Wunused-result] 328 | atomic_notifier_chain_register(&s390_epoch_delta_notifier, | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 329 | &kvm_clock_notifier); | ~~~~~~~~~~~~~~~~~~~~ -- drivers/s390/char/con3270.c: In function 'con3270_init': >> drivers/s390/char/con3270.c:644:9: warning: ignoring return value of 'atomic_notifier_chain_register' declared with attribute 'warn_unused_result' [-Wunused-result] 644 | atomic_notifier_chain_register(&panic_notifier_list, &on_panic_nb); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ -- drivers/s390/char/con3215.c: In function 'con3215_init': >> drivers/s390/char/con3215.c:868:9: warning: ignoring return value of 'atomic_notifier_chain_register' declared with attribute 'warn_unused_result' [-Wunused-result] 868 | atomic_notifier_chain_register(&panic_notifier_list, &on_panic_nb); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ -- drivers/s390/char/sclp_con.c: In function 'sclp_console_init': >> drivers/s390/char/sclp_con.c:288:9: warning: ignoring return value of 'atomic_notifier_chain_register' declared with attribute 'warn_unused_result' [-Wunused-result] 288 | atomic_notifier_chain_register(&panic_notifier_list, &on_panic_nb); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ -- drivers/s390/char/sclp_vt220.c: In function 'sclp_vt220_con_init': >> drivers/s390/char/sclp_vt220.c:839:9: warning: ignoring return value of 'atomic_notifier_chain_register' declared with attribute 'warn_unused_result' [-Wunused-result] 839 | atomic_notifier_chain_register(&panic_notifier_list, &on_panic_nb); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ -- drivers/s390/char/zcore.c: In function 'zcore_init': >> drivers/s390/char/zcore.c:326:9: warning: ignoring return value of 'atomic_notifier_chain_register' declared with attribute 'warn_unused_result' [-Wunused-result] 326 | atomic_notifier_chain_register(&panic_notifier_list, &zcore_on_panic_notifier); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ vim +2072 arch/s390/kernel/ipl.c 99ca4e582d4a40 Michael Holzheu 2008-01-26 2044 99ca4e582d4a40 Michael Holzheu 2008-01-26 2045 void __init setup_ipl(void) 99ca4e582d4a40 Michael Holzheu 2008-01-26 2046 { bdbfe18595ceab Vasily Gorbik 2018-04-03 2047 BUILD_BUG_ON(sizeof(struct ipl_parameter_block) != PAGE_SIZE); bdbfe18595ceab Vasily Gorbik 2018-04-03 2048 99ca4e582d4a40 Michael Holzheu 2008-01-26 2049 ipl_info.type = get_ipl_type(); 99ca4e582d4a40 Michael Holzheu 2008-01-26 2050 switch (ipl_info.type) { 99ca4e582d4a40 Michael Holzheu 2008-01-26 2051 case IPL_TYPE_CCW: 86c74d869d321b Martin Schwidefsky 2019-02-20 2052 ipl_info.data.ccw.dev_id.ssid = ipl_block.ccw.ssid; 86c74d869d321b Martin Schwidefsky 2019-02-20 2053 ipl_info.data.ccw.dev_id.devno = ipl_block.ccw.devno; 99ca4e582d4a40 Michael Holzheu 2008-01-26 2054 break; 99ca4e582d4a40 Michael Holzheu 2008-01-26 2055 case IPL_TYPE_FCP: 99ca4e582d4a40 Michael Holzheu 2008-01-26 2056 case IPL_TYPE_FCP_DUMP: 18e22a17722600 Sebastian Ott 2015-06-29 2057 ipl_info.data.fcp.dev_id.ssid = 0; 86c74d869d321b Martin Schwidefsky 2019-02-20 2058 ipl_info.data.fcp.dev_id.devno = ipl_block.fcp.devno; 86c74d869d321b Martin Schwidefsky 2019-02-20 2059 ipl_info.data.fcp.wwpn = ipl_block.fcp.wwpn; 86c74d869d321b Martin Schwidefsky 2019-02-20 2060 ipl_info.data.fcp.lun = ipl_block.fcp.lun; 99ca4e582d4a40 Michael Holzheu 2008-01-26 2061 break; 3737e8ee4f2fc7 Jason J. Herne 2020-03-02 2062 case IPL_TYPE_NVME: d70e38cb1deef3 Jason J. Herne 2020-03-17 2063 case IPL_TYPE_NVME_DUMP: 3737e8ee4f2fc7 Jason J. Herne 2020-03-02 2064 ipl_info.data.nvme.fid = ipl_block.nvme.fid; 3737e8ee4f2fc7 Jason J. Herne 2020-03-02 2065 ipl_info.data.nvme.nsid = ipl_block.nvme.nsid; 3737e8ee4f2fc7 Jason J. Herne 2020-03-02 2066 break; 99ca4e582d4a40 Michael Holzheu 2008-01-26 2067 case IPL_TYPE_NSS: 99ca4e582d4a40 Michael Holzheu 2008-01-26 2068 case IPL_TYPE_UNKNOWN: 99ca4e582d4a40 Michael Holzheu 2008-01-26 2069 /* We have no info to copy */ 99ca4e582d4a40 Michael Holzheu 2008-01-26 2070 break; 99ca4e582d4a40 Michael Holzheu 2008-01-26 2071 } 99ca4e582d4a40 Michael Holzheu 2008-01-26 @2072 atomic_notifier_chain_register(&panic_notifier_list, &on_panic_nb); 99ca4e582d4a40 Michael Holzheu 2008-01-26 2073 } 99ca4e582d4a40 Michael Holzheu 2008-01-26 2074 :::::: The code at line 2072 was first introduced by commit :::::: 99ca4e582d4a4088969681efff97be44d98421a1 [S390] kernel: Shutdown Actions Interface :::::: TO: Michael Holzheu :::::: CC: Martin Schwidefsky --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org