[kbuild-all] arch/sh/boot/compressed/../../lib/ashldi3.c:6:11: warning: no previous prototype for '__ashldi3'

tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 4c388a8e740d3235a194f330c8ef327deef710f6 commit: 7fe859eef99b6fac655416d5bb01c82bd0da2ada sh: boot: avoid unneeded rebuilds under arch/sh/boot/compressed/ date: 9 weeks ago config: sh-randconfig-r015-20211116 (attached as .config) 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/torvalds/linux.git/commit... git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout 7fe859eef99b6fac655416d5bb01c82bd0da2ada # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross ARCH=sh 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 >>): In file included from arch/sh/boot/compressed/ashldi3.c:2: 6 | long long __ashldi3(long long u, word_type b) | ^~~~~~~~~ vim +/__ashldi3 +6 arch/sh/boot/compressed/../../lib/ashldi3.c 1aad54a99b6ce3 Paul Mundt 2008-11-18 5 1aad54a99b6ce3 Paul Mundt 2008-11-18 @6 long long __ashldi3(long long u, word_type b) 1aad54a99b6ce3 Paul Mundt 2008-11-18 7 { 1aad54a99b6ce3 Paul Mundt 2008-11-18 8 DWunion uu, w; 1aad54a99b6ce3 Paul Mundt 2008-11-18 9 word_type bm; 1aad54a99b6ce3 Paul Mundt 2008-11-18 10 1aad54a99b6ce3 Paul Mundt 2008-11-18 11 if (b == 0) 1aad54a99b6ce3 Paul Mundt 2008-11-18 12 return u; 1aad54a99b6ce3 Paul Mundt 2008-11-18 13 1aad54a99b6ce3 Paul Mundt 2008-11-18 14 uu.ll = u; 1aad54a99b6ce3 Paul Mundt 2008-11-18 15 bm = 32 - b; 1aad54a99b6ce3 Paul Mundt 2008-11-18 16 1aad54a99b6ce3 Paul Mundt 2008-11-18 17 if (bm <= 0) { 1aad54a99b6ce3 Paul Mundt 2008-11-18 18 w.s.low = 0; 1aad54a99b6ce3 Paul Mundt 2008-11-18 19 w.s.high = (unsigned int) uu.s.low << -bm; 1aad54a99b6ce3 Paul Mundt 2008-11-18 20 } else { 1aad54a99b6ce3 Paul Mundt 2008-11-18 21 const unsigned int carries = (unsigned int) uu.s.low >> bm; 1aad54a99b6ce3 Paul Mundt 2008-11-18 22 1aad54a99b6ce3 Paul Mundt 2008-11-18 23 w.s.low = (unsigned int) uu.s.low << b; 1aad54a99b6ce3 Paul Mundt 2008-11-18 24 w.s.high = ((unsigned int) uu.s.high << b) | carries; 1aad54a99b6ce3 Paul Mundt 2008-11-18 25 } 1aad54a99b6ce3 Paul Mundt 2008-11-18 26 1aad54a99b6ce3 Paul Mundt 2008-11-18 27 return w.ll; 1aad54a99b6ce3 Paul Mundt 2008-11-18 28 } 1aad54a99b6ce3 Paul Mundt 2008-11-18 29 :::::: The code at line 6 was first introduced by commit :::::: 1aad54a99b6ce316c851ba99b2efe41998cfd37d sh: Migrate necessary libgcc bits in to arch/sh/lib for SUPERH32. :::::: TO: Paul Mundt <lethal(a)linux-sh.org&gt; :::::: CC: Paul Mundt <lethal(a)linux-sh.org&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org