Hi Christophe, I love your patch! Perhaps something to improve: [auto build test WARNING on powerpc/next] [also build test WARNING on linus/master v5.13-rc1 next-20210512] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch] url: https://github.com/0day-ci/linux/commits/Christophe-Leroy/kprobes-Allow-a... base: https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git next config: i386-randconfig-r012-20210512 (attached as .config) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 reproduce (this is a W=1 build): # https://github.com/0day-ci/linux/commit/2a1f135a9ce3c4d86d3bdefed561aa177... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Christophe-Leroy/kprobes-Allow-architectures-to-override-optinsn-page-allocation/20210512-223121 git checkout 2a1f135a9ce3c4d86d3bdefed561aa17760f430f # save the attached .config to linux build tree make W=1 W=1 ARCH=i386 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 >>): 324 | void __weak *alloc_optinsn_page(void) | ^~~~~~~~~~~~~~~~~~ 329 | void __weak free_optinsn_page(void *page) | ^~~~~~~~~~~~~~~~~ vim +/alloc_optinsn_page +324 kernel/kprobes.c 322 323 #ifdef CONFIG_OPTPROBES 325 { 326 return alloc_insn_page(); 327 } 328 330 { 331 free_insn_page(page); 332 } 333 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org