[kbuild-all] drivers/firmware/efi/capsule-loader.c:91:12: warning: no previous prototype for 'efi_capsule_setup_info'

tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: cb690f5238d71f543f4ce874aa59237cf53a877c commit: a18b14d8886614b3c7d290c4cfc33389822b0535 riscv: Disable STACKPROTECTOR_PER_TASK if GCC_PLUGIN_RANDSTRUCT is enabled date: 3 months ago config: riscv-randconfig-r022-20211109 (attached as .config) compiler: riscv32-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 a18b14d8886614b3c7d290c4cfc33389822b0535 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross ARCH=riscv 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 >>): 91 | int __weak efi_capsule_setup_info(struct capsule_info *cap_info, void *kbuff, | ^~~~~~~~~~~~~~~~~~~~~~ -- lib/test_hexdump.c: In function 'test_hexdump_prepare_test.constprop': 116 | strncpy(p, data_a, l); | ^~~~~~~~~~~~~~~~~~~~~ vim +/efi_capsule_setup_info +91 drivers/firmware/efi/capsule-loader.c 65117f1aa1b2d14 Kweh, Hock Leong 2016-04-25 79 3fabd628d5ea24b Ard Biesheuvel 2017-06-02 80 /** 3fabd628d5ea24b Ard Biesheuvel 2017-06-02 81 * efi_capsule_setup_info - obtain the efi capsule header in the binary and 3fabd628d5ea24b Ard Biesheuvel 2017-06-02 82 * setup capsule_info structure 3fabd628d5ea24b Ard Biesheuvel 2017-06-02 83 * @cap_info: pointer to current instance of capsule_info structure 3fabd628d5ea24b Ard Biesheuvel 2017-06-02 84 * @kbuff: a mapped first page buffer pointer 3fabd628d5ea24b Ard Biesheuvel 2017-06-02 85 * @hdr_bytes: the total received number of bytes for efi header 3fabd628d5ea24b Ard Biesheuvel 2017-06-02 86 * 3fabd628d5ea24b Ard Biesheuvel 2017-06-02 87 * Platforms with non-standard capsule update mechanisms can override 3fabd628d5ea24b Ard Biesheuvel 2017-06-02 88 * this __weak function so they can perform any required capsule 3fabd628d5ea24b Ard Biesheuvel 2017-06-02 89 * image munging. See quark_quirk_function() for an example. 3fabd628d5ea24b Ard Biesheuvel 2017-06-02 90 **/ 3fabd628d5ea24b Ard Biesheuvel 2017-06-02 @91 int __weak efi_capsule_setup_info(struct capsule_info *cap_info, void *kbuff, 3fabd628d5ea24b Ard Biesheuvel 2017-06-02 92 size_t hdr_bytes) 3fabd628d5ea24b Ard Biesheuvel 2017-06-02 93 { 3fabd628d5ea24b Ard Biesheuvel 2017-06-02 94 /* Only process data block that is larger than efi header size */ 3fabd628d5ea24b Ard Biesheuvel 2017-06-02 95 if (hdr_bytes < sizeof(efi_capsule_header_t)) 3fabd628d5ea24b Ard Biesheuvel 2017-06-02 96 return 0; 3fabd628d5ea24b Ard Biesheuvel 2017-06-02 97 3fabd628d5ea24b Ard Biesheuvel 2017-06-02 98 memcpy(&cap_info->header, kbuff, sizeof(cap_info->header)); 3fabd628d5ea24b Ard Biesheuvel 2017-06-02 99 cap_info->total_size = cap_info->header.imagesize; 3fabd628d5ea24b Ard Biesheuvel 2017-06-02 100 3fabd628d5ea24b Ard Biesheuvel 2017-06-02 101 return __efi_capsule_setup_info(cap_info); 3fabd628d5ea24b Ard Biesheuvel 2017-06-02 102 } 3fabd628d5ea24b Ard Biesheuvel 2017-06-02 103 :::::: The code at line 91 was first introduced by commit :::::: 3fabd628d5ea24b02ddb1230ffca1df0f779f84e efi/capsule-loader: Redirect calls to efi_capsule_setup_info() via weak alias :::::: TO: Ard Biesheuvel <ard.biesheuvel(a)linaro.org&gt; :::::: CC: Ingo Molnar <mingo(a)kernel.org&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org