[PATCH 1/2] kprobes: Allow architectures to override optinsn page allocation

kernel test robot lkp at intel.com
Thu May 13 05:04:51 AEST 2021

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

url:    https://github.com/0day-ci/linux/commits/Christophe-Leroy/kprobes-Allow-architectures-to-override-optinsn-page-allocation/20210512-223121
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/2a1f135a9ce3c4d86d3bdefed561aa17760f430f
        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 at intel.com>

All warnings (new ones prefixed by >>):

>> kernel/kprobes.c:324:14: warning: no previous prototype for 'alloc_optinsn_page' [-Wmissing-prototypes]
     324 | void __weak *alloc_optinsn_page(void)
         |              ^~~~~~~~~~~~~~~~~~
>> kernel/kprobes.c:329:13: warning: no previous prototype for 'free_optinsn_page' [-Wmissing-prototypes]
     329 | void __weak free_optinsn_page(void *page)
         |             ^~~~~~~~~~~~~~~~~

vim +/alloc_optinsn_page +324 kernel/kprobes.c

   323	#ifdef CONFIG_OPTPROBES
 > 324	void __weak *alloc_optinsn_page(void)
   325	{
   326		return alloc_insn_page();
   327	}
 > 329	void __weak free_optinsn_page(void *page)
   330	{
   331		free_insn_page(page);
   332	}

0-DAY CI Kernel Test Service, Intel Corporation
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