Messages in this thread | | | Date | Thu, 24 Feb 2022 08:24:58 +0800 | From | kernel test robot <> | Subject | [hare-scsi-devel:tls-upcall.v2 34/67] crypto/hkdf.c:26:5: warning: no previous prototype for function 'hkdf_extract' |
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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@intel.com/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@intel.com>
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,
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