Yet another useless report! On Tue, Mar 16, 2021 at 07:50:10AM +0800, kernel test robot wrote: > tree: https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git x86/cpu > head: 301cddc21a157a3072d789a3097857202e550a24 > commit: a89dfde3dc3c2dbf56910af75e2d8b11ec5308f6 [2/3] x86: Remove dynamic NOP selection > compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 > > If you fix the issue, kindly add following tag as appropriate > Reported-by: kernel test robot <lkp(a)intel.com&gt; > > > cppcheck possible warnings: (new ones prefixed by >>, may not real problems) What's cppcheck? That? Description-en: tool for static C/C++ code analysis (CLI) Cppcheck is a command-line tool that tries to detect bugs that your > >> arch/x86/kernel/alternative.c:96:10: warning: Undefined behaviour, pointer arithmetic 'x86nops+10' is out of bounds. [pointerOutOfBounds] > x86nops + 1 + 2 + 3 + 4, > ^ > arch/x86/kernel/alternative.c:97:10: warning: Undefined behaviour, pointer arithmetic 'x86nops+15' is out of bounds. [pointerOutOfBounds] > x86nops + 1 + 2 + 3 + 4 + 5, > ^ > arch/x86/kernel/alternative.c:98:10: warning: Undefined behaviour, pointer arithmetic 'x86nops+21' is out of bounds. [pointerOutOfBounds] > x86nops + 1 + 2 + 3 + 4 + 5 + 6, > ^ > arch/x86/kernel/alternative.c:99:10: warning: Undefined behaviour, pointer arithmetic 'x86nops+28' is out of bounds. [pointerOutOfBounds] > x86nops + 1 + 2 + 3 + 4 + 5 + 6 + 7, > ^ > >> arch/x86/kernel/ftrace.c:304:7: warning: union member 'ftrace_op_code_union::code' is never used. [unusedStructMember] > char code[OP_REF_SIZE]; > ^ How do you trigger this? /me ignores it until there's some info on how those things can be reproduced.