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Subject[mingo-tip:master 2294/2300] arch/mips/crypto/chacha-glue.c:45:34: error: implicit declaration of function 'round_down'
tree:   git://git.kernel.org/pub/scm/linux/kernel/git/mingo/tip.git master
head: 4e348e961395297bb17f101cc63bc133d8a348e9
commit: a35948847a1e0bf875f580f821cb871ce16d4c60 [2294/2300] headers/deps: time: Optimize <linux/time64.h> dependencies, remove <linux/time64_api.h> inclusion
config: mips-randconfig-r034-20220108 (https://download.01.org/0day-ci/archive/20220109/202201090259.KZeo3bGb-lkp@intel.com/config)
compiler: mipsel-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/mingo/tip.git/commit/?id=a35948847a1e0bf875f580f821cb871ce16d4c60
git remote add mingo-tip git://git.kernel.org/pub/scm/linux/kernel/git/mingo/tip.git
git fetch --no-tags mingo-tip master
git checkout a35948847a1e0bf875f580f821cb871ce16d4c60
# save the config file to linux build tree
mkdir build_dir
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=mips 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 >>):

arch/mips/crypto/chacha-glue.c: In function 'chacha_mips_stream_xor':
>> arch/mips/crypto/chacha-glue.c:45:34: error: implicit declaration of function 'round_down' [-Werror=implicit-function-declaration]
45 | nbytes = round_down(nbytes, walk.stride);
| ^~~~~~~~~~
cc1: some warnings being treated as errors


vim +/round_down +45 arch/mips/crypto/chacha-glue.c

3a2f58f3ba4f6f Ard Biesheuvel 2019-11-08 29
3a2f58f3ba4f6f Ard Biesheuvel 2019-11-08 30 static int chacha_mips_stream_xor(struct skcipher_request *req,
3a2f58f3ba4f6f Ard Biesheuvel 2019-11-08 31 const struct chacha_ctx *ctx, const u8 *iv)
3a2f58f3ba4f6f Ard Biesheuvel 2019-11-08 32 {
3a2f58f3ba4f6f Ard Biesheuvel 2019-11-08 33 struct skcipher_walk walk;
3a2f58f3ba4f6f Ard Biesheuvel 2019-11-08 34 u32 state[16];
3a2f58f3ba4f6f Ard Biesheuvel 2019-11-08 35 int err;
3a2f58f3ba4f6f Ard Biesheuvel 2019-11-08 36
3a2f58f3ba4f6f Ard Biesheuvel 2019-11-08 37 err = skcipher_walk_virt(&walk, req, false);
3a2f58f3ba4f6f Ard Biesheuvel 2019-11-08 38
3a2f58f3ba4f6f Ard Biesheuvel 2019-11-08 39 chacha_init_generic(state, ctx->key, iv);
3a2f58f3ba4f6f Ard Biesheuvel 2019-11-08 40
3a2f58f3ba4f6f Ard Biesheuvel 2019-11-08 41 while (walk.nbytes > 0) {
3a2f58f3ba4f6f Ard Biesheuvel 2019-11-08 42 unsigned int nbytes = walk.nbytes;
3a2f58f3ba4f6f Ard Biesheuvel 2019-11-08 43
3a2f58f3ba4f6f Ard Biesheuvel 2019-11-08 44 if (nbytes < walk.total)
3a2f58f3ba4f6f Ard Biesheuvel 2019-11-08 @45 nbytes = round_down(nbytes, walk.stride);
3a2f58f3ba4f6f Ard Biesheuvel 2019-11-08 46
3a2f58f3ba4f6f Ard Biesheuvel 2019-11-08 47 chacha_crypt(state, walk.dst.virt.addr, walk.src.virt.addr,
3a2f58f3ba4f6f Ard Biesheuvel 2019-11-08 48 nbytes, ctx->nrounds);
3a2f58f3ba4f6f Ard Biesheuvel 2019-11-08 49 err = skcipher_walk_done(&walk, walk.nbytes - nbytes);
3a2f58f3ba4f6f Ard Biesheuvel 2019-11-08 50 }
3a2f58f3ba4f6f Ard Biesheuvel 2019-11-08 51
3a2f58f3ba4f6f Ard Biesheuvel 2019-11-08 52 return err;
3a2f58f3ba4f6f Ard Biesheuvel 2019-11-08 53 }
3a2f58f3ba4f6f Ard Biesheuvel 2019-11-08 54

:::::: The code at line 45 was first introduced by commit
:::::: 3a2f58f3ba4f6f44e33d1a48240d5eadb882cb59 crypto: mips/chacha - wire up accelerated 32r2 code from Zinc

:::::: TO: Ard Biesheuvel <ardb@kernel.org>
:::::: CC: Herbert Xu <herbert@gondor.apana.org.au>

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

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