Hi Jan, First bad commit (maybe != root cause): tree: https://github.com/zen-kernel/zen-kernel 5.11/zen-sauce head: 791993e1c1fd68c5c05295efabebb8b4b3579f3a commit: a09abe2fc9c447bcf7c7f9888d63fb448da29ed6 [5/24] ZEN: Unrestrict CONFIG_OPTIMIZE_FOR_PERFORMANCE_O3 config: h8300-randconfig-r012-20210216 (attached as .config) compiler: h8300-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://github.com/zen-kernel/zen-kernel/commit/a09abe2fc9c447bcf7c7f9888... git remote add zen-kernel-zen-kernel https://github.com/zen-kernel/zen-kernel git fetch --no-tags zen-kernel-zen-kernel 5.11/zen-sauce git checkout a09abe2fc9c447bcf7c7f9888d63fb448da29ed6 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=h8300 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 >>): crypto/nhpoly1305.c: In function 'crypto_nhpoly1305_update': 195 | } | ^ -- drivers/input/joystick/sidewinder.c: In function 'sw_connect': 787 | } | ^ vim +195 crypto/nhpoly1305.c 26609a21a94601 Eric Biggers 2018-11-16 190 26609a21a94601 Eric Biggers 2018-11-16 191 int crypto_nhpoly1305_update(struct shash_desc *desc, 26609a21a94601 Eric Biggers 2018-11-16 192 const u8 *src, unsigned int srclen) 26609a21a94601 Eric Biggers 2018-11-16 193 { 26609a21a94601 Eric Biggers 2018-11-16 194 return crypto_nhpoly1305_update_helper(desc, src, srclen, nh_generic); 26609a21a94601 Eric Biggers 2018-11-16 @195 } 26609a21a94601 Eric Biggers 2018-11-16 196 EXPORT_SYMBOL(crypto_nhpoly1305_update); 26609a21a94601 Eric Biggers 2018-11-16 197 :::::: The code at line 195 was first introduced by commit :::::: 26609a21a9460145e37d90947ad957b358a05288 crypto: nhpoly1305 - add NHPoly1305 support :::::: TO: Eric Biggers <ebiggers(a)google.com&gt; :::::: CC: Herbert Xu <herbert(a)gondor.apana.org.au&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org