Hi "Jason,

I love your patch! Yet something to improve:

[auto build test ERROR on linux/master]
[also build test ERROR on char-misc/char-misc-testing herbert-cryptodev-2.6/master herbert-crypto-2.6/master linus/master v5.16-rc6 next-20211221]
[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/Jason-A-Donenfeld/random-use-BLAKE2s-instead-of-SHA1-in-extraction/20211222-021452
base:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 136057256686de39cc3a07c2e39ef6bc43003ff6
config: i386-tinyconfig (https://download.01.org/0day-ci/archive/20211222/202112220446.QXGU4ozn-lkp@intel.com/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/79f40c8f3c427b4f4819dca21ea159bc3c0350f0
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Jason-A-Donenfeld/random-use-BLAKE2s-instead-of-SHA1-in-extraction/20211222-021452
        git checkout 79f40c8f3c427b4f4819dca21ea159bc3c0350f0
        # save the config file to linux build tree
        mkdir build_dir
        make W=1 O=build_dir ARCH=i386 SHELL=/bin/bash

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

All errors (new ones prefixed by >>):

   ld: lib/crypto/blake2s.o: in function `blake2s_mod_init':
>> blake2s.c:(.init.text+0x1): undefined reference to `blake2s_selftest'

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