[hare-scsi-devel:tls-upcall.v2 34/67] crypto/hkdf.c:26:5: warning: no previous prototype for function 'hkdf_extract'
From: kernel test robot
Date: Wed Feb 23 2022 - 19:26:01 EST
tree: https://git.kernel.org/pub/scm/linux/kernel/git/hare/scsi-devel.git tls-upcall.v2
head: ac729ea3c52bda460616c71d5f5fc47b2e64da6d
commit: 04ae9ad78a4ea9280f04e5e001fd8a179665d1c1 [34/67] crypto,fs: Separate out hkdf_extract() and hkdf_expand()
config: riscv-buildonly-randconfig-r002-20220223 (https://download.01.org/0day-ci/archive/20220224/202202240845.4HsZOLts-lkp@xxxxxxxxx/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project d271fc04d5b97b12e6b797c6067d3c96a8d7470e)
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
# install riscv cross compiling tool for clang build
# apt-get install binutils-riscv64-linux-gnu
# https://git.kernel.org/pub/scm/linux/kernel/git/hare/scsi-devel.git/commit/?id=04ae9ad78a4ea9280f04e5e001fd8a179665d1c1
git remote add hare-scsi-devel https://git.kernel.org/pub/scm/linux/kernel/git/hare/scsi-devel.git
git fetch --no-tags hare-scsi-devel tls-upcall.v2
git checkout 04ae9ad78a4ea9280f04e5e001fd8a179665d1c1
# save the config file to linux build tree
mkdir build_dir
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=riscv SHELL=/bin/bash
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@xxxxxxxxx>
All warnings (new ones prefixed by >>):
>> crypto/hkdf.c:26:5: warning: no previous prototype for function 'hkdf_extract' [-Wmissing-prototypes]
int hkdf_extract(struct crypto_shash *hmac_tfm, const u8 *ikm,
^
crypto/hkdf.c:26:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
int hkdf_extract(struct crypto_shash *hmac_tfm, const u8 *ikm,
^
static
crypto/hkdf.c:57:5: warning: unused variable 'prefix' [-Wunused-variable]
u8 prefix[9];
^
>> crypto/hkdf.c:52:5: warning: no previous prototype for function 'hkdf_expand' [-Wmissing-prototypes]
int hkdf_expand(struct crypto_shash *hmac_tfm,
^
crypto/hkdf.c:52:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
int hkdf_expand(struct crypto_shash *hmac_tfm,
^
static
3 warnings generated.
vim +/hkdf_extract +26 crypto/hkdf.c
14
15 /*
16 * HKDF consists of two steps:
17 *
18 * 1. HKDF-Extract: extract a pseudorandom key of length HKDF_HASHLEN bytes from
19 * the input keying material and optional salt.
20 * 2. HKDF-Expand: expand the pseudorandom key into output keying material of
21 * any length, parameterized by an application-specific info string.
22 *
23 */
24
25 /* HKDF-Extract (RFC 5869 section 2.2), unsalted */
> 26 int hkdf_extract(struct crypto_shash *hmac_tfm, const u8 *ikm,
27 unsigned int ikmlen, u8 *prk)
28 {
29 unsigned int prklen = crypto_shash_digestsize(hmac_tfm);
30 u8 *default_salt;
31 int err;
32
33 default_salt = kzalloc(prklen, GFP_KERNEL);
34 if (!default_salt)
35 return -ENOMEM;
36 err = crypto_shash_setkey(hmac_tfm, default_salt, prklen);
37 if (!err)
38 err = crypto_shash_tfm_digest(hmac_tfm, ikm, ikmlen, prk);
39
40 kfree(default_salt);
41 return err;
42 }
43 EXPORT_SYMBOL_GPL(hkdf_extract);
44
45 /*
46 * HKDF-Expand (RFC 5869 section 2.3).
47 * This expands the pseudorandom key, which was already keyed into @hmac_tfm,
48 * into @okmlen bytes of output keying material parameterized by the
49 * application-specific @info of length @infolen bytes.
50 * This is thread-safe and may be called by multiple threads in parallel.
51 */
> 52 int hkdf_expand(struct crypto_shash *hmac_tfm,
---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx