Hi Prakhar, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on arm64/for-next/core] [also build test WARNING on powerpc/next integrity/next-integrity v5.8-rc6 next-20200720] [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/Prakhar-Srivastava/Add-support-t... base: https://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-next/core config: arm64-allyesconfig (attached as .config) compiler: aarch64-linux-gcc (GCC) 9.3.0 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 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arm64 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 >>): 49 | int ima_get_kexec_buffer(void **addr, size_t *size) | ^~~~~~~~~~~~~~~~~~~~ 73 | int ima_free_kexec_buffer(void) | ^~~~~~~~~~~~~~~~~~~~~ security/integrity/ima/ima_kexec.c:161:6: warning: no previous prototype for 'ima_add_kexec_buffer' [-Wmissing-prototypes] 161 | void ima_add_kexec_buffer(struct kimage *image) | ^~~~~~~~~~~~~~~~~~~~ vim +/ima_get_kexec_buffer +49 security/integrity/ima/ima_kexec.c 0cc3b50ba7b5c5 Prakhar Srivastava 2020-07-20 41 0cc3b50ba7b5c5 Prakhar Srivastava 2020-07-20 42 /** 0cc3b50ba7b5c5 Prakhar Srivastava 2020-07-20 43 * ima_get_kexec_buffer - get IMA buffer from the previous kernel 0cc3b50ba7b5c5 Prakhar Srivastava 2020-07-20 44 * @addr: On successful return, set to point to the buffer contents. 0cc3b50ba7b5c5 Prakhar Srivastava 2020-07-20 45 * @size: On successful return, set to the buffer size. 0cc3b50ba7b5c5 Prakhar Srivastava 2020-07-20 46 * 0cc3b50ba7b5c5 Prakhar Srivastava 2020-07-20 47 * Return: 0 on success, negative errno on error. 0cc3b50ba7b5c5 Prakhar Srivastava 2020-07-20 48 */ 0cc3b50ba7b5c5 Prakhar Srivastava 2020-07-20 @49 int ima_get_kexec_buffer(void **addr, size_t *size) 0cc3b50ba7b5c5 Prakhar Srivastava 2020-07-20 50 { 0cc3b50ba7b5c5 Prakhar Srivastava 2020-07-20 51 int ret, len; 0cc3b50ba7b5c5 Prakhar Srivastava 2020-07-20 52 unsigned long tmp_addr; 0cc3b50ba7b5c5 Prakhar Srivastava 2020-07-20 53 size_t tmp_size; 0cc3b50ba7b5c5 Prakhar Srivastava 2020-07-20 54 const void *prop; 0cc3b50ba7b5c5 Prakhar Srivastava 2020-07-20 55 0cc3b50ba7b5c5 Prakhar Srivastava 2020-07-20 56 prop = of_get_property(of_chosen, "linux,ima-kexec-buffer", &len); 0cc3b50ba7b5c5 Prakhar Srivastava 2020-07-20 57 if (!prop) 0cc3b50ba7b5c5 Prakhar Srivastava 2020-07-20 58 return -ENOENT; 0cc3b50ba7b5c5 Prakhar Srivastava 2020-07-20 59 0cc3b50ba7b5c5 Prakhar Srivastava 2020-07-20 60 ret = do_get_kexec_buffer(prop, len, &tmp_addr, &tmp_size); 0cc3b50ba7b5c5 Prakhar Srivastava 2020-07-20 61 if (ret) 0cc3b50ba7b5c5 Prakhar Srivastava 2020-07-20 62 return ret; 0cc3b50ba7b5c5 Prakhar Srivastava 2020-07-20 63 0cc3b50ba7b5c5 Prakhar Srivastava 2020-07-20 64 *addr = __va(tmp_addr); 0cc3b50ba7b5c5 Prakhar Srivastava 2020-07-20 65 *size = tmp_size; 0cc3b50ba7b5c5 Prakhar Srivastava 2020-07-20 66 0cc3b50ba7b5c5 Prakhar Srivastava 2020-07-20 67 return 0; 0cc3b50ba7b5c5 Prakhar Srivastava 2020-07-20 68 } 0cc3b50ba7b5c5 Prakhar Srivastava 2020-07-20 69 0cc3b50ba7b5c5 Prakhar Srivastava 2020-07-20 70 /** 0cc3b50ba7b5c5 Prakhar Srivastava 2020-07-20 71 * ima_free_kexec_buffer - free memory used by the IMA buffer 0cc3b50ba7b5c5 Prakhar Srivastava 2020-07-20 72 */ 0cc3b50ba7b5c5 Prakhar Srivastava 2020-07-20 @73 int ima_free_kexec_buffer(void) 0cc3b50ba7b5c5 Prakhar Srivastava 2020-07-20 74 { 0cc3b50ba7b5c5 Prakhar Srivastava 2020-07-20 75 int ret; 0cc3b50ba7b5c5 Prakhar Srivastava 2020-07-20 76 unsigned long addr; 0cc3b50ba7b5c5 Prakhar Srivastava 2020-07-20 77 size_t size; 0cc3b50ba7b5c5 Prakhar Srivastava 2020-07-20 78 struct property *prop; 0cc3b50ba7b5c5 Prakhar Srivastava 2020-07-20 79 0cc3b50ba7b5c5 Prakhar Srivastava 2020-07-20 80 prop = of_find_property(of_chosen, "linux,ima-kexec-buffer", NULL); 0cc3b50ba7b5c5 Prakhar Srivastava 2020-07-20 81 if (!prop) 0cc3b50ba7b5c5 Prakhar Srivastava 2020-07-20 82 return -ENOENT; 0cc3b50ba7b5c5 Prakhar Srivastava 2020-07-20 83 0cc3b50ba7b5c5 Prakhar Srivastava 2020-07-20 84 ret = do_get_kexec_buffer(prop->value, prop->length, &addr, &size); 0cc3b50ba7b5c5 Prakhar Srivastava 2020-07-20 85 if (ret) 0cc3b50ba7b5c5 Prakhar Srivastava 2020-07-20 86 return ret; 0cc3b50ba7b5c5 Prakhar Srivastava 2020-07-20 87 0cc3b50ba7b5c5 Prakhar Srivastava 2020-07-20 88 ret = of_remove_property(of_chosen, prop); 0cc3b50ba7b5c5 Prakhar Srivastava 2020-07-20 89 if (ret) 0cc3b50ba7b5c5 Prakhar Srivastava 2020-07-20 90 return ret; 0cc3b50ba7b5c5 Prakhar Srivastava 2020-07-20 91 0cc3b50ba7b5c5 Prakhar Srivastava 2020-07-20 92 return memblock_free(addr, size); 0cc3b50ba7b5c5 Prakhar Srivastava 2020-07-20 93 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org