[kbuild-all] [kees:for-next/array-bounds 9/10] arch/sh/kernel/machvec.c:105:33: warning: array subscript 'struct sh_machine_vector[0]' is partly outside array bounds of 'long int[1]'

tree: https://git.kernel.org/pub/scm/linux/kernel/git/kees/linux.git for-next/array-bounds head: 3ccac0d2ba34a8e6f722975136f06c30fb586ca0 commit: 4ba545781e20f49cf1175e11d9f606e621040acf [9/10] Makefile: Enable -Warray-bounds config: sh-allmodconfig (https://download.01.org/0day-ci/archive/20220125/202201251510.55XdBprq-lk...) compiler: sh4-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/kees/linux.git/commit/?id... git remote add kees https://git.kernel.org/pub/scm/linux/kernel/git/kees/linux.git git fetch --no-tags kees for-next/array-bounds git checkout 4ba545781e20f49cf1175e11d9f606e621040acf # save the config file to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=sh SHELL=/bin/bash arch/sh/kernel/ 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 >>): arch/sh/kernel/machvec.c: In function 'early_parse_mv': arch/sh/kernel/machvec.c:44:15: warning: variable 'mv_comma' set but not used [-Wunused-but-set-variable] 44 | char *mv_comma; | ^~~~~~~~ arch/sh/kernel/machvec.c: In function 'sh_mv_setup': 105 | sh_mv = *(struct sh_machine_vector *)&__machvec_start; | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ In file included from arch/sh/kernel/machvec.c:13: arch/sh/include/asm/sections.h:7:13: note: while referencing '__machvec_start' 7 | extern long __machvec_start, __machvec_end; | ^~~~~~~~~~~~~~~ vim +105 arch/sh/kernel/machvec.c 9655ad03af2d23 Paul Mundt 2007-05-14 80 9655ad03af2d23 Paul Mundt 2007-05-14 81 void __init sh_mv_setup(void) 9655ad03af2d23 Paul Mundt 2007-05-14 82 { 82f81f4784479d Paul Mundt 2007-05-15 83 /* 82f81f4784479d Paul Mundt 2007-05-15 84 * Only overload the machvec if one hasn't been selected on 82f81f4784479d Paul Mundt 2007-05-15 85 * the command line with sh_mv= 82f81f4784479d Paul Mundt 2007-05-15 86 */ fd8f20e8e2f8f1 Paul Mundt 2007-05-15 87 if (!machvec_selected) { 82f81f4784479d Paul Mundt 2007-05-15 88 unsigned long machvec_size; 82f81f4784479d Paul Mundt 2007-05-15 89 82f81f4784479d Paul Mundt 2007-05-15 90 machvec_size = ((unsigned long)&__machvec_end - 82f81f4784479d Paul Mundt 2007-05-15 91 (unsigned long)&__machvec_start); 82f81f4784479d Paul Mundt 2007-05-15 92 5556410e220387 Paul Mundt 2007-08-07 93 /* 5556410e220387 Paul Mundt 2007-08-07 94 * Sanity check for machvec section alignment. Ensure 5556410e220387 Paul Mundt 2007-08-07 95 * __initmv hasn't been misused. 5556410e220387 Paul Mundt 2007-08-07 96 */ 5556410e220387 Paul Mundt 2007-08-07 97 if (machvec_size % sizeof(struct sh_machine_vector)) 5556410e220387 Paul Mundt 2007-08-07 98 panic("machvec misaligned, invalid __initmv use?"); 5556410e220387 Paul Mundt 2007-08-07 99 82f81f4784479d Paul Mundt 2007-05-15 100 /* 82f81f4784479d Paul Mundt 2007-05-15 101 * If the machvec hasn't been preselected, use the first 82f81f4784479d Paul Mundt 2007-05-15 102 * vector (usually the only one) from .machvec.init. 82f81f4784479d Paul Mundt 2007-05-15 103 */ 82f81f4784479d Paul Mundt 2007-05-15 104 if (machvec_size >= sizeof(struct sh_machine_vector)) 82f81f4784479d Paul Mundt 2007-05-15 @105 sh_mv = *(struct sh_machine_vector *)&__machvec_start; :::::: The code at line 105 was first introduced by commit :::::: 82f81f4784479df17a80caff4a7156da0a2f7dea sh: Kill off machvec aliases. :::::: TO: Paul Mundt <lethal(a)linux-sh.org&gt; :::::: CC: Paul Mundt <lethal(a)hera.kernel.org&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org