Hi Masahiro, [auto build test WARNING on mmarek/for-next] [also build test WARNING on next-20171013] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system] url: https://github.com/0day-ci/linux/commits/Masahiro-Yamada/kbuild-use-relative-path-from-srctree-instead-of-__FILE__/20171015-012234 base: git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild for-next config: sparc64-allmodconfig (attached as .config) compiler: sparc64-linux-gnu-gcc (Debian 6.1.1-9) 6.1.1 20160705 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # save the attached .config to linux build tree make.cross ARCH=sparc64 All warnings (new ones prefixed by >>): lib/dynamic_debug.c: In function 'trim_prefix': >> lib/dynamic_debug.c:71:13: warning: overflow in implicit constant conversion [-Woverflow] int skip = strlen(__FILE__) - strlen("lib/dynamic_debug.c"); ^~~~~~ vim +71 lib/dynamic_debug.c e9d376f0 Jason Baron 2009-02-05 67 2b678319 Jim Cromie 2011-12-19 68 /* Return the path relative to source root */ 2b678319 Jim Cromie 2011-12-19 69 static inline const char *trim_prefix(const char *path) 2b678319 Jim Cromie 2011-12-19 70 { 2b678319 Jim Cromie 2011-12-19 @71 int skip = strlen(__FILE__) - strlen("lib/dynamic_debug.c"); 2b678319 Jim Cromie 2011-12-19 72 2b678319 Jim Cromie 2011-12-19 73 if (strncmp(path, __FILE__, skip)) 2b678319 Jim Cromie 2011-12-19 74 skip = 0; /* prefix mismatch, don't skip */ 2b678319 Jim Cromie 2011-12-19 75 2b678319 Jim Cromie 2011-12-19 76 return path + skip; 2b678319 Jim Cromie 2011-12-19 77 } 2b678319 Jim Cromie 2011-12-19 78 :::::: The code at line 71 was first introduced by commit :::::: 2b6783191da7211c88f98eb1a2bd2027bff36e30 dynamic_debug: add trim_prefix() to provide source-root relative paths :::::: TO: Jim Cromie <jim.cromie@xxxxxxxxx> :::::: CC: Greg Kroah-Hartman <gregkh@xxxxxxx> --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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