tree: https://git.kernel.org/pub/scm/linux/kernel/git/arnd/playground.git Wextra head: 5d0c476a9aa8d83304ee40320c1533a7443c6af5 commit: 51d8bbf29f744fc470126e3b0a5a64fd5c155f0d [31/32] kbuild: consolidate extra warnings in scripts/Makefile.extrawarn config: s390-allyesconfig (attached as .config) compiler: s390-linux-gcc (GCC) 9.3.0 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/arnd/playground.git/commi... git remote add arnd-playground https://git.kernel.org/pub/scm/linux/kernel/git/arnd/playground.git git fetch --no-tags arnd-playground Wextra git checkout 51d8bbf29f744fc470126e3b0a5a64fd5c155f0d # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=s390 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): drivers/s390/block/dasd_proc.c: In function 'dasd_devices_show': 64 | seq_printf(m, " at (???:??????)"); | vim +64 drivers/s390/block/dasd_proc.c ^1da177e4c3f41 Linus Torvalds 2005-04-16 34 ^1da177e4c3f41 Linus Torvalds 2005-04-16 35 static int ^1da177e4c3f41 Linus Torvalds 2005-04-16 36 dasd_devices_show(struct seq_file *m, void *v) ^1da177e4c3f41 Linus Torvalds 2005-04-16 37 { ^1da177e4c3f41 Linus Torvalds 2005-04-16 38 struct dasd_device *device; 8e09f21574ea30 Stefan Weinhuber 2008-01-26 39 struct dasd_block *block; ^1da177e4c3f41 Linus Torvalds 2005-04-16 40 char *substr; ^1da177e4c3f41 Linus Torvalds 2005-04-16 41 ^1da177e4c3f41 Linus Torvalds 2005-04-16 42 device = dasd_device_from_devindex((unsigned long) v - 1); ^1da177e4c3f41 Linus Torvalds 2005-04-16 43 if (IS_ERR(device)) ^1da177e4c3f41 Linus Torvalds 2005-04-16 44 return 0; 8e09f21574ea30 Stefan Weinhuber 2008-01-26 45 if (device->block) 8e09f21574ea30 Stefan Weinhuber 2008-01-26 46 block = device->block; a5e2383991ee98 Stefan Weinhuber 2008-03-05 47 else { a5e2383991ee98 Stefan Weinhuber 2008-03-05 48 dasd_put_device(device); 8e09f21574ea30 Stefan Weinhuber 2008-01-26 49 return 0; a5e2383991ee98 Stefan Weinhuber 2008-03-05 50 } ^1da177e4c3f41 Linus Torvalds 2005-04-16 51 /* Print device number. */ 2a0217d5c7d22d Kay Sievers 2008-10-10 52 seq_printf(m, "%s", dev_name(&device->cdev->dev)); ^1da177e4c3f41 Linus Torvalds 2005-04-16 53 /* Print discipline string. */ 294001a80c9810 Stefan Haberland 2010-01-27 54 if (device->discipline != NULL) ^1da177e4c3f41 Linus Torvalds 2005-04-16 55 seq_printf(m, "(%s)", device->discipline->name); ^1da177e4c3f41 Linus Torvalds 2005-04-16 56 else ^1da177e4c3f41 Linus Torvalds 2005-04-16 57 seq_printf(m, "(none)"); ^1da177e4c3f41 Linus Torvalds 2005-04-16 58 /* Print kdev. */ 8e09f21574ea30 Stefan Weinhuber 2008-01-26 59 if (block->gdp) ^1da177e4c3f41 Linus Torvalds 2005-04-16 60 seq_printf(m, " at (%3d:%6d)", f331c0296f2a9f Tejun Heo 2008-09-03 61 MAJOR(disk_devt(block->gdp)), f331c0296f2a9f Tejun Heo 2008-09-03 62 MINOR(disk_devt(block->gdp))); ^1da177e4c3f41 Linus Torvalds 2005-04-16 63 else ^1da177e4c3f41 Linus Torvalds 2005-04-16 @64 seq_printf(m, " at (???:??????)"); ^1da177e4c3f41 Linus Torvalds 2005-04-16 65 /* Print device name. */ 8e09f21574ea30 Stefan Weinhuber 2008-01-26 66 if (block->gdp) 8e09f21574ea30 Stefan Weinhuber 2008-01-26 67 seq_printf(m, " is %-8s", block->gdp->disk_name); ^1da177e4c3f41 Linus Torvalds 2005-04-16 68 else ^1da177e4c3f41 Linus Torvalds 2005-04-16 69 seq_printf(m, " is ????????"); ^1da177e4c3f41 Linus Torvalds 2005-04-16 70 /* Print devices features. */ c6eb7b7703ac4b Horst Hummel 2005-09-03 71 substr = (device->features & DASD_FEATURE_READONLY) ? "(ro)" : " "; ^1da177e4c3f41 Linus Torvalds 2005-04-16 72 seq_printf(m, "%4s: ", substr); ^1da177e4c3f41 Linus Torvalds 2005-04-16 73 /* Print device status information. */ 294001a80c9810 Stefan Haberland 2010-01-27 74 switch (device->state) { ^1da177e4c3f41 Linus Torvalds 2005-04-16 75 case DASD_STATE_NEW: ^1da177e4c3f41 Linus Torvalds 2005-04-16 76 seq_printf(m, "new"); ^1da177e4c3f41 Linus Torvalds 2005-04-16 77 break; ^1da177e4c3f41 Linus Torvalds 2005-04-16 78 case DASD_STATE_KNOWN: ^1da177e4c3f41 Linus Torvalds 2005-04-16 79 seq_printf(m, "detected"); ^1da177e4c3f41 Linus Torvalds 2005-04-16 80 break; ^1da177e4c3f41 Linus Torvalds 2005-04-16 81 case DASD_STATE_BASIC: ^1da177e4c3f41 Linus Torvalds 2005-04-16 82 seq_printf(m, "basic"); ^1da177e4c3f41 Linus Torvalds 2005-04-16 83 break; 90f0094dc607ab Horst Hummel 2006-03-07 84 case DASD_STATE_UNFMT: b707dbe6c52e14 Horst Hummel 2006-03-09 85 seq_printf(m, "unformatted"); 90f0094dc607ab Horst Hummel 2006-03-07 86 break; ^1da177e4c3f41 Linus Torvalds 2005-04-16 87 case DASD_STATE_READY: ^1da177e4c3f41 Linus Torvalds 2005-04-16 88 case DASD_STATE_ONLINE: ^1da177e4c3f41 Linus Torvalds 2005-04-16 89 seq_printf(m, "active "); 8e09f21574ea30 Stefan Weinhuber 2008-01-26 90 if (dasd_check_blocksize(block->bp_block)) ^1da177e4c3f41 Linus Torvalds 2005-04-16 91 seq_printf(m, "n/f "); ^1da177e4c3f41 Linus Torvalds 2005-04-16 92 else ^1da177e4c3f41 Linus Torvalds 2005-04-16 93 seq_printf(m, 7bf76f01695382 Jan Höppner 2017-08-15 94 "at blocksize: %u, %lu blocks, %lu MB", 8e09f21574ea30 Stefan Weinhuber 2008-01-26 95 block->bp_block, block->blocks, 8e09f21574ea30 Stefan Weinhuber 2008-01-26 96 ((block->bp_block >> 9) * 8e09f21574ea30 Stefan Weinhuber 2008-01-26 97 block->blocks) >> 11); ^1da177e4c3f41 Linus Torvalds 2005-04-16 98 break; ^1da177e4c3f41 Linus Torvalds 2005-04-16 99 default: ^1da177e4c3f41 Linus Torvalds 2005-04-16 100 seq_printf(m, "no stat"); ^1da177e4c3f41 Linus Torvalds 2005-04-16 101 break; ^1da177e4c3f41 Linus Torvalds 2005-04-16 102 } ^1da177e4c3f41 Linus Torvalds 2005-04-16 103 dasd_put_device(device); ^1da177e4c3f41 Linus Torvalds 2005-04-16 104 if (dasd_probeonly) ^1da177e4c3f41 Linus Torvalds 2005-04-16 105 seq_printf(m, "(probeonly)"); ^1da177e4c3f41 Linus Torvalds 2005-04-16 106 seq_printf(m, "\n"); ^1da177e4c3f41 Linus Torvalds 2005-04-16 107 return 0; ^1da177e4c3f41 Linus Torvalds 2005-04-16 108 } ^1da177e4c3f41 Linus Torvalds 2005-04-16 109 :::::: The code at line 64 was first introduced by commit :::::: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Linux-2.6.12-rc2 :::::: TO: Linus Torvalds <torvalds(a)ppc970.osdl.org&gt; :::::: CC: Linus Torvalds <torvalds(a)ppc970.osdl.org&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org