lib/crypto/blake2s-selftest.c:566:13: warning: no previous prototype for 'blake2s_selftest'

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   585e5b17b92dead8a3aca4e3c9876fbca5f7e0ba
commit: 66d7fb94e4ffe5acc589e0b2b4710aecc1f07a28 crypto: blake2s - generic C library implementation and selftest
date:   12 months ago
config: parisc-randconfig-r003-20201113 (attached as .config)
compiler: hppa-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
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=66d7fb94e4ffe5acc589e0b2b4710aecc1f07a28
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 66d7fb94e4ffe5acc589e0b2b4710aecc1f07a28
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=parisc 

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

All warnings (new ones prefixed by >>):

>> lib/crypto/blake2s-selftest.c:566:13: warning: no previous prototype for 'blake2s_selftest' [-Wmissing-prototypes]
     566 | bool __init blake2s_selftest(void)
         |             ^~~~~~~~~~~~~~~~

vim +/blake2s_selftest +566 lib/crypto/blake2s-selftest.c

   565	
 > 566	bool __init blake2s_selftest(void)

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

Attachment: .config.gz
Description: application/gzip