[kees:kspp/memcpy/next-20210618/v0.192314 57/90] arch/arm/boot/compressed/misc.c:164:6: warning: no previous prototype for 'fortify_warn_write'

[kees:kspp/memcpy/next-20210618/v0.192314 57/90] arch/arm/boot/compressed/misc.c:164:6: warning: no previous prototype for 'fortify_warn_write'

[kernel test robot]

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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/kees/linux.git kspp/memcpy/next-20210618/v0.192314
head:   bbcfcdcf3881ef6f9ae1b1b8e0ddf03da30c5aad
commit: 37bd2f986fbed8a837e7657c7a44d588e79c5aad [57/90] fortify: Detect struct member overflows in memcpy()
config: arm-spear13xx_defconfig (attached as .config)
compiler: arm-linux-gnueabi-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
        # https://git.kernel.org/pub/scm/linux/kernel/git/kees/linux.git/commit/?id=37bd2f986fbed8a837e7657c7a44d588e79c5aad
        git remote add kees https://git.kernel.org/pub/scm/linux/kernel/git/kees/linux.git
        git fetch --no-tags kees kspp/memcpy/next-20210618/v0.192314
        git checkout 37bd2f986fbed8a837e7657c7a44d588e79c5aad
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arm 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

   arch/arm/boot/compressed/misc.c:126:17: warning: no previous prototype for '__div0' [-Wmissing-prototypes]
     126 | asmlinkage void __div0(void)
         |                 ^~~~~~
   arch/arm/boot/compressed/misc.c:133:6: warning: no previous prototype for '__stack_chk_fail' [-Wmissing-prototypes]
     133 | void __stack_chk_fail(void)
         |      ^~~~~~~~~~~~~~~~
   arch/arm/boot/compressed/misc.c:142:1: warning: no previous prototype for 'decompress_kernel' [-Wmissing-prototypes]
     142 | decompress_kernel(unsigned long output_start, unsigned long free_mem_ptr_p,
         | ^~~~~~~~~~~~~~~~~
>> arch/arm/boot/compressed/misc.c:164:6: warning: no previous prototype for 'fortify_warn_write' [-Wmissing-prototypes]
     164 | void fortify_warn_write(const char *func, size_t buffer_size, size_t write_size)
         |      ^~~~~~~~~~~~~~~~~~
   arch/arm/boot/compressed/misc.c:169:6: warning: no previous prototype for 'fortify_panic' [-Wmissing-prototypes]
     169 | void fortify_panic(const char *name)
         |      ^~~~~~~~~~~~~


vim +/fortify_warn_write +164 arch/arm/boot/compressed/misc.c

   163	
 > 164	void fortify_warn_write(const char *func, size_t buffer_size, size_t write_size)
   165	{
   166		putstr("warning: detected buffer overflow\n");
   167	}
   168	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all(a)lists.01.org

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